Use App
Home
Categories
City Plants Application
English
English
繁體中文
日本語
Español
Français
Deutsch
Pусский
Português
Italiano
한국어
Nederlands
العربية
Svenska
Polskie
ภาษาไทย
Bahasa Melayu
email
Your free 7-day Premium hasn’t been claimed yet. Click to claim.
more icon close icon
care_about care_about
About
care_basic_guide care_basic_guide
Basic Care
care_advanced_guide care_advanced_guide
Advanced Care
care_seasonal_tips care_seasonal_tips
Seasonal Tips
care_pet_and_diseases care_pet_and_diseases
Pests & Diseases
care_more_info care_more_info
More Info
care_faq care_faq
FAQ
care_related_plants care_related_plants
Related Plants
Home > Plant Care Guide > Blue Cereus

How to care Blue Cereus

Blue cereus (Cereus hexagonus) is a tree-like cactus that can grow to 15 m tall. It has a grayish-green twisted stalk with thorns along the five ridges. It blooms from spring to summer with large white blossoms that open at night. Flowers are funnel-shaped and can be up to 25 cm long. Edible fruits are pale red and ripen in fall. Grows best in full sun with well-drained soil.
Sunlight
Sunlight
Full sun
Blue cereus
Blue cereus
Blue cereus
Blue cereus
Blue cereus
plant_diagnosis plant_diagnosis
Plant Diagnosis
Diagnose and revive your plant. 10,000,000+ plants helped
reminders reminders
Reminders
A custom schedule to meet your plants’ needs
light_meter light_meter
Light Meter
Find the best growing location for your plant baby
plant_finder plant_finder
Plant Finder
Find plants that are right for your skill level, site, lighting, etc
care_basic_guide

Basic Care Guide

Cultivation:WaterDetail

Water

Blue cereus is a drought-tolerant plant that does not require frequent watering. Water thoroughly when the soil is completely dry. When potted, water slowly, wait for water to flow out the bottom, and then pour the excess water from the tray to avoid water accumulation.
Spring, summer, and fall are its growing seasons. Water once or twice a week to keep the soil slightly wet. In winter, water less; just keep the soil from drying excessively; usually once a week. Besides, water with rainwater or distilled water rather than tap water.
Tap water contains a lot of calcium, magnesium, and other mineral salts. Long-term use tends to cause soil compaction. Avoid splashing water on its stem when watering to prevent rotting.

Water

Blue cereus is native to regions with arid temperatures, and it's important not to overwater them. This plant needs moderate moisture levels and minimal care, so it's important to know how to water it properly.
Potted Blue cereus
Blue cereus is very tolerant of drought. This means that you don't need to water them very often. Watering frequency should also depend on the climate where you live. Most of the time, you only need to water your succulents once every two to three weeks in the summer and spring. Another tip when watering this species is to water it from the bottom. This is for the proper absorption of water to the roots, enabling it to circulate the nutrients from the soil towards its whole body. When you accidentally spill water at the top part, this can cause the development of diseases and fungi. During the winter and fall, reduce the watering or avoid this as this plant tends to become dormant. You can cut back on watering or once every 21 to 28 days when it begins to cool down.
In humid locations, there's no need to water a lot. When keeping the Blue cereus indoors, you won't have to keep the moisture high, especially if the plant does not receive too much sunlight. When there's too much moisture and not enough light, this can spell disaster for the succulents.
Before you give this plant a drink, it's always a good idea to check the soil's moisture levels by poking your finger in it or using a moisture meter. This will tell you whether the soil is already too dry or if there's still moisture. It's a technique used by owners of smaller potted plants to know whether it's time to water or not.When they are fully grown, water them less since they can survive without water compared to when they were small. You need to give them time to get used to your climate and growing conditions before watering them. If they are indoors, keep them in indirect light and water them less frequently. Avoid using cold water during the winter and months, and you might be overwatering when the plants are located indoors.
Ground Blue cereus
Know that these plants can survive for weeks without any water. This is because they have water storage capacity that can conserve water for a long time. so it will conserve enough water to stay alive even if they are in the wild.
When they are planted outdoors, never water them lightly as this will result in more shallow root growth. Wait for a few weeks and only give them a drink when the soil around them is too dry. rainwater can be another excellent alternative when you want to hold back on watering. When you live in an area where you don't get much rain, water at least once every three weeks to prevent the soil from drying too much.
Underwater and overwater
When you're still in the process of buying a Blue cereus , make sure to ask first if the soil is properly draining or sandy. When the topsoil does not properly drain, there's a chance that the plant will likely not receive enough water in the future.
When you see that the Blue cereus begins to turn yellow, know that this can be caused by underwatering or overwatering. Also, the browning and dropping symptoms indicate that your plant is getting too much moisture and water. If there's not enough water, the indication can be seen with the yellow tips that can begin to form on stems and branches.
When the soil is too wet, then there might be the presence of fungal infections. You should allow everything to dry, and you should not overwater.You can see the squishy stems, drooping growth, and discolored parts that are all signs of too much moisture. It's critical to give the species time to recover and allow the pot to dry. Transfer it to a different container to avoid root rot and prevent it from dripping. If planted outside, you can also transfer it into a pot, especially in the winter, to help it recover.
Another thing is that the Blue cereus tends to die when it's constantly getting overwatered and if it's receiving too much rain if planted outside. Use rainwater or distilled water whenever possible as the plants don't like many minerals in their drink.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
close
Cultivation:WaterDetail
waterreminders

Never miss a care task again!

Plant care made easier than ever with our tailor-made smart care reminder.
What's the best method to water my Blue cereus?
Another tip when watering this species is to water it from the bottom. This is for the proper absorption of water to the roots, enabling it to circulate the nutrients from the soil towards its whole body. When you accidentally spill water at the top part, this can cause the development of diseases and fungi.
Use sprinklers when you have irrigation systems. Get the small sprinklers if you have Blue cereused in your garden. It's best to get the revolving ones that allow you to change the water delivery patterns whenever you need them. Avoid turning on the sprinkler on windy days. Make sure to use the soak and dry method regardless if the Blue cereus is in a pot or your garden. This will evenly distribute the moisture across the root systems resulting in healthier growth.
Some owners might want to get a built-in drainage system for their succulents. This is where layers of porous materials like recycled glass or hydro stones are placed beneath the soil. They will generally be a reservoir for excess water, so it's important not to pour too much water into these built-in systems.
Read More more
Free
What should I do if I water my Blue cereus too much/too little?
When you see that the Blue cereus begins to turn yellow, know that this can be caused by underwatering or overwatering. When the soil is too wet, then there might be the presence of fungal infections. You should allow everything to dry, and you should not overwater.
Also, the browning and dropping symptoms indicate that your plant is getting too much moisture and water. If there's not enough water, the indication can be seen with the yellow tips that can begin to form on stems and branches.
When you're still in the process of buying the Blue cereus, make sure to ask first if the soil is properly draining or sandy. When the topsoil does not properly drain, there's a chance that the plant will likely not receive enough water in the future.
Another thing is that the Blue cereus tends to die when it's constantly getting overwatered and if it's receiving too much rain if planted outside. Use rainwater or distilled water whenever possible as the plants don't like many minerals in their drink.
You can see the squishy stems, drooping growth, and discolored parts that are all signs of too much moisture. It's critical to give the species time to recover and allow the pot to dry. Transfer it to a different container to avoid root rot and prevent it from dripping. If planted outside, you can also transfer it into a pot, especially in the winter, to help it recover.
Read More more
lock
How often should I water my Blue cereus?
Most of the time, you only need to water your succulents once every two to three weeks in the summer and spring. During the winter and fall, reduce the watering or avoid this as this plant tends to become dormant.
Let the soil dry completely, and it's always a good idea to lean on the side of underwatering rather than overwatering. When they are in the pot, water deeply at intervals to encourage healthier soil growth.
When they are planted outdoors, never water them lightly as this will result in more shallow root growth. Wait for a few weeks and only give them a drink when the soil around them is too dry.
Read More more
lock
How much water does my Blue cereus need?
Water this succulent efficiently and make sure to cover the entire pot. Set a saucer at the bottom of the pot so the roots will get enough moisture. When you see that the soil begins to saturate, take out the saucer immediately. The holes in the pot and the amount of soil will determine the frequency and the quantity of water you should give your plant. A can of water is often more than enough for the Blue cereus especially if they are planted in pots.
When you plant them in the garden or outdoors, you need to include the rainwater they receive. About an inch of rainwater is more than enough to last them for a few weeks, so refrain from watering. When they are outside, you need to water them in the morning with about a gallon of water after you see that the soil is bone dry so the sunlight can help evaporate the excess moisture.
Read More more
lock
Why is watering my Blue cereus important?
Watering the Blue cereus will help transport the nutrients that it needs from the soil to the rest of the plant. Without enough moisture, the Blue cereus won't remain healthy or might even become malnourished. Watering should be done when you see some signs that the plant is thirsty. When you're in doubt, you should never overwater as this can be a way to kill them.
The best way to water them is the soak and dry method. When you see that the soil becomes too dry, you should soak them in water until you see that the pot is dripping with water underneath. Then, go for weeks without watering to give the soil a chance to rest.
Read More more
lock
How can I ensure that i'm watering my Blue cereus adequately?
Before you give this plant a drink, it's always a good idea to check the soil's moisture levels by poking your finger in it or using a moisture meter. This will tell you whether the soil is already too dry or if there's still moisture. It's a technique used by owners of smaller potted plants to know whether it's time to water or not.
Assess the needs of your Blue cereus and know that it requires watering every two weeks during the summer. You can go as far as three weeks in the hot season before watering this, but in the fall or winter, there should not be any water at all. Allow the soil to dry between irrigations. They can be grown in greenhouses and other warm spots indoors and thrive well. When your plant is getting too much light, you can increase the watering frequency as long as you see that the soil is dry. They can also be grown outdoors, where you will need to water them less. Give it enough water once every three weeks; this should be more than enough. Don't rely alone on irrigations and sprinklers to reach their bases. Use a soaker hose that will hit the ground and spread the water. Make sure it won't hit much of the body of the plant as this can result in diseases.
Read More more
lock
Should I adjust the frequency of watering my Blue cereus according to different seasons or climates?
Blue cereus is very tolerant of drought. This means that you don't need to water them very often. Watering frequency should also depend on the climate where you live. In a dry environment, you can make the watering conditions adapt well to your plants' needs. When they are in their early flowering stages, you might want to increase watering to help them grow. When they are receiving enough sunlight, water only in the morning. Specifically, they can be watered once every 10 to 14 days during the summer. You can increase this frequency during times of heat waves and make sure to mist the base from time to time lightly. When it's too cold, you can cut back on watering or once every 21 to 28 days when it begins to cool down.
Read More more
lock
Should I adjust the watering frequency during the different growing stages of my Blue cereus?
When you've just repotted the plant, you should wait for a week before you can water your Blue cereus. When it's time to water them, be generous until you see the water coming out of the potholes but don't make it a deluge. When they have already grown and received medium light, you might want to water them once every 2 to 3 weeks since they are very tolerant to drought.
In the winter, you will further need to cut back on watering. The ideal time is to water it once every 3 to 4 weeks as long as the soil does not feel too dry. Winter is their resting season, so they don't consume a lot of energy or grow at this time.
If you grow the plants outdoors, rainwater can be another excellent alternative when you want to hold back on watering. When you live in an area where you don't get much rain, water at least once every three weeks to prevent the soil from drying too much.
In humid locations, there's no need to water a lot. When keeping the Blue cereus indoors, you won't have to keep the moisture high, especially if the plant does not receive too much sunlight. When there's too much moisture and not enough light, this can spell disaster for the succulents.
Read More more
lock
What should I be careful with when I water my Blue cereus in different seasons, climates, or during different growing periods?
The Blue cereus growing outdoors can thrive with rainfall, but when it’s planted in a pot, you need to be careful while Blue cereus is still in the growing stage. One way to prevent overwatering is to check the top bottom inches of the soil for moisture. Once again, you need it to be dry so you can water it again. If you're unsure of the amount and the frequency, especially during the growing phase, go with underwatering and slightly increase it when you see a need. It's always a good idea to take a picture of the Blue cereus and note how it looks after watering it. You can take things further by using moisture meters or hygrometers to check the air and soil moisture. These tools are available from various shops and can be valuable when you want to know the readings for humidity and water.
Read More more
lock
Should I water my Blue cereus differently when I plant it indoors vs outdoors?
Know that these plants can survive for weeks without any water. This is because they have water storage capacity that can conserve water for a long time. so it will conserve enough water to stay alive even if they are in the wild.
When they are fully grown, water them less since they can survive without water compared to when they were small. You need to give them time to get used to your climate and growing conditions before watering them. If they are indoors, keep them in indirect light and water them less frequently. Avoid using cold water during the winter and months, and you might be overwatering when the plants are located indoors. Give this a rest, especially during the winter and fall.
When they are outdoors, refrain from watering too much. They should be able to get enough humidity, moisture, and rainfall that will keep them alive. Only water when you see that their leaves are becoming droopy and yellowish. Always lean on the side of underwatering as the Blue cereus is very tolerant to dry conditions. They don't like wet feet and might wilt when you water them too much.
Read More more
lock
left right
Cultivation:FertilizerDetail

Fertilizer

In growing seasons (namely spring, summer and fall), fertilize blue cereus once a month with liquid fertilizer. No fertilizer is required in winter. A small amount of slow-release fertilizer can be well mixed into the soil when repotting in spring or fall.
Use nitrogen fertilizer during seedling and phosphate-potassium fertilizer before and after blooming. The fertilizer concentration should be as low as possible. It would be better to apply low-concentrate fertilizer several times rather than to use a high concentration. If the base is yellow and grows slowly, the cause may be excessive fertilizer, and fertilization should be immediately stopped.

Fertilizer

Often found growing in rock gardens and used in xeriscaping, Blue cereus adds plenty of interest and texture to the area. It is a slow-growing plant, and this affects its care. Blue cereus does not require a lot of nutrients to thrive. Knowing when and how to feed your specimen will help ensure you get years of enjoyment from your plant. Fertilizing Blue cereus adds nutrients to the growing medium. Even though it does store water and nutrients, applying plant food during the growing season helps support healthy growth. Fertilizing can also encourage mature specimens to produce blooms in the growing season.
While all plants benefit from additional nutrients, Blue cereus only needs a light dose of fertilizer during the growing season. The frequency of fertilization should be 1-2 times a year. It is suggested to fertilize your Blue cereus in the spring and autumn, but not in winter&summer when it is dormant. Be careful with repotted plants, you will want to reduce the amount of fertilizer. It’s also a good idea to wait a couple of months after repotting before you start applying fertilizer. It’s best to use a liquid plant food formulated for succulents and cacti when you are fertilizing Blue cereus. Dilute the fertilizer with water to half-strength. You do not want the fertilizer building up in the soil. Apply the fertilizer to the base of the plant and water thoroughly, ensuring any excess moisture drains from the container or seeps into the ground.
It is easier to use liquid plant food when you are fertilizing Blue cereus, but granules are another option. Follow the directions on the packaging, making sure you dilute liquid fertilizers to half-strength. Whether you are using granules are liquid plant food, always apply it to the soil. Cover the granules with a thin layer of soil and water regardless of the type of plant food you are using.
Over-fertilizing Blue cereus is a common problem with new and experienced gardeners. The plant has low nutritional needs and it’s easy to apply a little too much fertilizer. Over-fertilizing Blue cereus can burn the plant’s sensitive roots resulting in its slow decay. Without its root system, the plant cannot absorb nutrients and moisture.
Like most plants, Blue cereus has a dormancy period and it is when you want to stop the applications of fertilizer. In the summer and winter, the plant ceases growing, and it is when you want to stop applying fertilizer. It’s also a good idea to cease fertilizing for the first couple of months after repotting in the spring.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
close
Cultivation:FertilizerDetail
Why do I need to fertilize my Blue cereus?
Fertilizing Blue cereus adds nutrients to the growing medium. Even though it does store water and nutrients, applying plant food during the growing season helps support healthy growth. Fertilizing can also encourage mature specimens to produce blooms in the growing season.
Read More more
Free
When is the best time to fertilize my Blue cereus?
While all plants benefit from additional nutrients, Blue cereus only needs a light dose of fertilizer during the growing season. The frequency of fertilization should be 1-2 times a year. It is suggested to fertilize your Blue cereus in the spring and autumn, but not in winter&summer when it is dormant. Be careful with repotted plants, you will want to reduce the amount of fertilizer. It’s also a good idea to wait a couple of months after repotting before you start applying fertilizer.
Read More more
lock
When should I avoid fertilizing my Blue cereus?
Like most plants, Blue cereus has a dormancy period and it is when you want to stop the applications of fertilizer. In the summer and winter, the plant ceases growing, and it is when you want to stop applying fertilizer. It’s also a good idea to cease fertilizing for the first couple of months after repotting in the spring.
Read More more
lock
What type of fertilizer does my Blue cereus need?
It’s best to use a liquid plant food formulated for succulents and cacti when you are fertilizing Blue cereus. Dilute the fertilizer with water to half-strength. You do not want the fertilizer building up in the soil. Apply the fertilizer to the base of the plant and water thoroughly, ensuring any excess moisture drains from the container or seeps into the ground.
Read More more
lock
How do I fertilize my Blue cereus?
It is easier to use liquid plant food when you are fertilizing Blue cereus, but granules are another option. Follow the directions on the packaging, making sure you dilute liquid fertilizers to half-strength. Whether you are using granules are liquid plant food, always apply it to the soil. Cover the granules with a thin layer of soil and water regardless of the type of plant food you are using.
Read More more
lock
What happens if I fertilize my Blue cereus too much?
Over-fertilizing Blue cereus is a common problem with new and experienced gardeners. The plant has low nutritional needs and it’s easy to apply a little too much fertilizer. Over-fertilizing Blue cereus can burn the plant’s sensitive roots resulting in its slow decay. Without its root system, the plant cannot absorb nutrients and moisture.
Read More more
lock
left right
Cultivation:SunlightDetail

Sunlight

Blue cereus is a heliophilic plant and needs sufficient sunlight for its growth and blooming. It can be placed on the outdoor balcony or in the garden without shade. However, long-time exposure to blazing sunlight should be avoided in hot summer, when it needs to be shaded or cooled a little to prevent high temperatures from damaging it.
Cultivation:SunlightDetail
lightmeter

Know the light your plants really get.

Find the best spots for them to optimize their health, simply using your phone.
How much sunlight does Blue cereus need to grow?
Blue cereus should get at least 6 hours of sun per day, and preferably more. An actual minimum number of hours can vary depending on the intensity of sunlight and other environmental factors, but it is unlikely that the Blue cereus will get too much sunlight. They do fine with up to 14 hours of sun per day.
Read More more
Free
What type of sunlight does Blue cereus need?
Blue cereus needs a lot of bright sunlight. As full-sun plants, they can thrive when given direct light or bright indirect sun. Some types may be able to survive with partial sun, but more sunlight is generally better.
Read More more
lock
Should I protect Blue cereus from sun exposure?
Blue cereus usually grows in some of the hottest, sunniest places in the world and is well adapted to that kind of environment, so it does not need to be protected from the sun. However, you should be careful about making a sudden move into a very sunny location if your Blue cereus is not used to it. Plants need time to adapt to different conditions, so start by moving this plant into the sun for a couple of hours at a time each day, then gradually lengthen the amount of sun exposure. Once adapted, most types of Blue cereus will be fine in full sun and don't need protection.
Read More more
lock
What will happen if Blue cereus doesn't get enough sunlight?
Without enough sunlight, Blue cereus will fail to thrive and grow. Common symptoms of inadequate sunlight include pale coloring, wilting leaves, and leaf drop. Blue cereus may also exhibit etiolation (also called legginess). This condition occurs as the plant attempts to stretch toward the light source, leading to a sparse appearance and weak stems.
Read More more
lock
What will happen if Blue cereus gets too much sunlight?
Blue cereus may develop shades of red, pink, or orange as a means of protection from excess sunlight, so many people like to cause mild sun stress to these plants during the summer. This is not harmful, and they will revert to their normal coloring when light levels decrease from autumn to spring.
If moved too quickly into direct sun, Blue cereus can suffer from sunburn. This looks like white or brown spots on the uppermost leaves that have been exposed to the most sun. A sunburned plant should be moved to a shadier location and watered if needed. Sun-damaged leaves can be removed, and should be replaced by new growth over time.
Read More more
lock
Does Blue cereus need special care about sunlight during its different growth stages?
As with most plants, younger Blue cereus will be more sensitive to strong sunlight and heat than a mature specimen. They should also be protected from direct sun immediately after being transplanted, either by a shade or by keeping the container in a shadier location until the plant is established and putting out new growth.
Read More more
lock
Are there any cautions or tips for sunlight and Blue cereus?
It is best to water Blue cereus in the morning, particularly during the summer months. If water sits on the leaves or in the crown of the plant, it can burn the plant when the water heats up. It’s also best not to water in the evening, since cooler overnight temperatures slow evaporation and fungi or bacteria can develop in the moist conditions.
Blue cereus grown in pots should be rotated occasionally to keep them growing symmetrically. Plants will normally grow toward the light source, so they can develop much more quickly on one side than the other if they are not rotated.
If Blue cereus is allowed to get dusty, it will not be able to access sunlight to create energy. The dust acts as a barrier, so the plant may show signs of inadequate light even if it’s in a sunny location. Keep the leaves and stems clean by wiping them periodically with a damp cloth to avoid this issue.
Read More more
lock
left right
Cultivation:PruningDetail

Pruning

Blue cereus does not require much pruning. Remove withered flowers and branches so the plant uses nutrients on healthy growth.
Cultivation:PruningDetail
care_advanced_guide

Advanced Care Guide

Cultivation:WaterAndHardinessDetail

Temperature

Blue cereus is distributed throughout tropical, subtropical, and semi-desert regions with scarce rainfall, intense sunlight, and hot temperatures. The optimum temperature for growth is 20 to 35 ℃. Lower than 10 ℃ or higher than 35 ℃, growth slows and dormancy begins. The air humidity should not be too high and the environment should be well-ventilated. Avoid high humidity and accumulated water.
Cultivation:WaterAndHardinessDetail
What's the ideal temperature for your Blue cereus?
It is more suitable to keep the Blue cereus in a particular range of conditions. Temperatures the same as 75-90℉ (25-32℃) are ideal for it. During the early winter season, the temperature shouldn't go below 75℉(25℃) for Blue cereus. You can even move it indoors as it will have better protection from the extremes.
Despite that, the Blue cereus can survive in some extreme temperatures. Sometimes can survive in low temperatures like 50℉ (15℃), but it is not ideal. You should bring it inside if winter conditions are expected outside.
Read More more
Free
How should I adjust the temperature for my Blue cereus during different growing phases?
Blue cereus has different growing phases. In the first stage, the dormant seed grows and transforms into a seedling. The dormant seeds need the appropriate conditions in their surroundings to grow as their seeds need a temperature of 75-90℉ (25-32℃) to germinate. The ideal time to make it grow vigorously is during the summer, as the most suitable temperature is around 85℉(30℃). You can adjust the placement of your Blue cereus from indoors to sunlight during the hot summer months to receive enough sunlight.
Read More more
lock
How can I keep my Blue cereus warm in cold seasons?
It's advisable to bring your Blue cereus indoors to avoid the harsh winter conditions. People opt to buy different types of grow light to provide enough sunlight for the plant. However, if your home is not extremely dark, it is not essential to buy these lights. Keep your plants where they will get the most sunlight possible. There should be sufficient light to keep the Blue cereus thriving in winter. If you have several Blue cereus, then keep them rotating so that they all receive enough sunlight.
Avoid placing your Blue cereus too close to the window if you live in northern areas with frigid weather. The cold may be extreme to them, due to which they might get damaged.
Read More more
lock
What happens to my Blue cereus when the temperature is too high or too low?
Your Blue cereus can grow better in summers and do better in warm temperatures 90℉(32℃) but you should protect it from temperature extremes during hot climates.
However, during winter, it is better to keep your plant dry. Blue cereus do well in temperate climates having temperatures between 75-90℉ (25-32℃). However, some gardeners can expose their Blue cereus to extreme temperatures causing stress in their plants. While high temperatures ranging between 90℉ and 95℉(32-35℃) can help maintain the deep colors for Blue cereus, you must be careful when trying out such experiment. During the hot summer season extremely high temperatures can burn your Blue cereus damaging their stem and root system. During the hottest time of the day (when the temperature is extremely high), consider relocating your plant to a shaded place or protect them with a shade cloth.
Read More more
lock
How should I adjust the temperature for my Blue cereus in different seasons?
In summers, high temperatures make the growth of Blue cereus slowed down to survive in too hot a temperature.
As the cooler periods and rainfall begins, the Blue cereus starts growing. If the place you live in has hot summers and warm winters with more rainfalls, you aren't required to change anything.
However, if you live in a place with cold winters, you should let your Blue cereus grow more in summer and rest in winter. It is because there is not enough sunlight for Blue cereus to grow in winter.
You can help your Blue cereus enter dormancy if you live in a place with cold temperatures by decreasing the temperature to 50℉ to 75℉ (15℃ to 25℃).
Read More more
lock
How can I keep my Blue cereus warm without a heating pad?
To withstand freezing temperatures outside, as a solution, you can insulate your Blue cereus with frost cloths, row covers, tents etc. You can also mulch your Blue cereus with small rocks. Mulching the Blue cereus soil will provide warmth to your plants and will not let you over-water the plant.
Read More more
lock
How can I protect my Blue cereus from temperature damage?
Blue cereus is adapted to sunlight and requires sufficient sunlight for healthy growth. You can place it in an outdoor environment without any shade. However, Blue cereus shouldn't be kept for a long time in the blazing sunlight in the hot summer when it requires to be put under shade so that extreme temperature doesn't damage them. If the winter is extreme in our area, you must keep your Blue cereus indoors to keep them away from frost.
Read More more
lock
What are the tips and precautions for keeping my Blue cereus at the right temperature?
Increase water and fertilizer during the growth of plants in spring and summer. Prevent your plant from receiving too much sunlight. To cool plants, spray water around them when the temperature is exceptionally high but don't put water on their stem.
Read More more
lock
left right
Cultivation:SoilDetail

Soil

Blue cereus grows best in fertile, gravel-rich, water-permeable soil with a pH value of 6-7. The culture soil formula often used is 60% vermiculite + 20% coco coir or peat moss + 20% sandy soil. A small amount of organic potting soil can also be added. Lightweight culture media such as vermiculite can be added to improve the air permeability of the soil. Eggshell powder or vermicompost can also be added to increase the soil fertility.
Roots of blue cereus are very sensitive to oxygen deficiency. If the soil is poorly permeable to air and water, root rot can set in. It's easy to judge permeability: when watering, water should pass through the medium quickly, rather than stop at the soil surface and slowly seep down. Repot and loosen the soil every year to ensure the air permeability of the soil.
Cultivation:SoilDetail
Cultivation:PropagationDetail

Propagation

Cultivation:PlantingDetail

Planting

Cultivation:HarvestDetail

Harvest

In addition to the seeding mentioned above, main propagation methods include division and grafting. To divide, cut off the tip or lateral branches of the stem with a knife and plant it in soil. After a period of time, many small shoots will grow up near the cut. When a shoot grows to proper size, it can be cut off and transplanted to form a new plant.
To graft, select a suitable rootstock. Cut the tip of the rootstock, such as the stem of pitahaya (Hylocereus undatus), and then put blue cereus, with its roots removed, in the center of the rootstock and fix it with a rope. After 1-2 weeks, the two parts grow together and the rope can be removed.

Propagation

If you want to get more plants, you can propagate them as follows.
The active growing season during the spring and summer is the best time to propagate Blue cereus. During this period, the plants are generating a lot of energy for new growth and should have plenty of stems that can be used for propagation. They can also recover from having cuttings taken during this season than during the slower autumn and winter seasons.
The following are what you need to prepare before propagation can take place.
  1. Sharp scissors or knife
  2. Diluted bleach solution or isopropyl alcohol to clean tools
  3. Pot(s) or nursery tray with drainage holes
  4. Special soil for succulents
  5. Clear plastic bag or a humidity dome for covering cuttings
  6. Rooting hormone (optional but recommended)
  7. Gardening gloves
Steps:
Step 1: Prepare containers by filling them with moistened planting material leaving about half an inch of space from the top of the container.
Step 2: Choose healthy parts for propagation. Cut off healthy stem nodes; the nodes should not be new growth, as this is not easy to succeed. You need to use a clean knife to break or cut off the stem intact at the node location.
Step 3: Leave them for 1-2 weeks, as you need to wait for the cut wounds to dry before taking cuttings. Dip the bottom end of the cutting into rooting powder (if using) according to the directions.
Step 4: Insert the stems into a loose, airy substrate, keeping them tilted, each about one-third of the way into the substrate. Water thoroughly once after planting, after which you need to wait until the soil is dry 2 inches under the surface before watering again.
Step 5: Place it in a location where the cuttings can get light but no direct sunlight, as this can be too intense for cuttings. Water occasionally and do not let the Blue cereus dry out.
Most species will begin to produce roots in about 3 weeks, After rooting, the plant will gradually grow new leaves, at which time you can start to harden off the Blue cereus. Hardening off involves gradually exposing the Blue cereus to more sunlight so that they have time to adjust before being moved permanently outside. Hardening off should usually take about 1 to 2 weeks depending on the outdoor conditions and the type of Blue cereus. After this period, Blue cereus can be planted in containers or directly in the ground.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
close
Cultivation:PropagationDetail
Sow, plant, or repot in spring or fall when the temperature is 15 to 20 ℃ . Keep air humidity high when seeding. Use plastic film to cover the soil and remove it after the seeds germinate.
Use permeable clay flowerpots for potted plants. Too large a flowerpot accumulates water easily, while too small a flowerpot limits the development of roots. Before planting, expose soil to blazing sunlight and disinfect to kill pathogens.
If planted in the garden, blue cereus prefers an area with full sun and loose soil. Remove all weeds and replace the soil if needed to ensure good water permeability and avoid root rot. Wear gloves or use tongs when planting to prevent your fingers from getting pricked. You can also wrap the plant in a towel to help you move it.
Cultivation:PlantingDetail
Most fruits of blue cereus are edible. Pick the fruit when they turn red. Avoid food safety issues by confirming the species with experts. Wear gloves or use scissors and other tools to harvest.
Cultivation:HarvestDetail
care_seasonal_tips

Seasonal Care Tips

seasonal-tip

Seasonal Precautions

During peak growth in spring, summer, and fall, increase water and fertilizer. Avoid sunlight exposure in the heat of the summer. Spray water around the plant to cool it down when the temperature is too high, but avoid leaving water on the stem. Avoid water accumulation in the soil. In winter, water it as little as possible or not at all, and stop fertilizer.
seasonal-tip
more

Summer

more

Fall

more

Winter

Succulents like this plant are actively growing in the summer.

more
1
Keep an eye on soil moisture levels. Do not allow the soil to completely dry out.
more
2
Continue fertilizing every couple of weeks with all-purpose plant food.
more
3
The plant also requires plenty of sunlight during the day to encourage blooming.
more
4
Prune back the old flowers after blooming at the end of the summer.
more
5
While your plant is actively growing, you can also remove stems for propagation. Place the stem in fresh soil and lightly water it.

While your plant is starting to enter dormancy towards the end of fall, it's still growing for much of the season.

more
1
Continue watering and fertilizing on a regular schedule, but reduce both of these routines as the season winds down and begins reaching dormancy.
more
2
Use an all-purpose fertilizer and water the plant when the soil is dry; make sure to err on the side of dry soil rather than soggy soil.
more
3
Keep making sure your plant receives enough light during this time, particularly during the morning or evening hours, which will help the plant grow well.

During the cold winter months, the plant usually goes into a dormant state.

more
1
Reduce watering your plant in the winter to give it a rest and let it lie dormant. It’s best to keep the plant dry during this season, rather than risk it being soggy.
more
2
Make sure it receives an adequate amount of sunlight, typically in the morning or evening, although it’s not as urgent during dormancy.
more
3
Since these plants don't survive in freezing outdoor temperatures, keep them in sufficiently warm rooms indoors, away from drafts or cold windows.
more
4
For the most part, you can leave these hardy plants to themselves during these colder months.
care_pet_and_diseases

Common Pests & Diseases

Common issues for Blue cereus based on 10 million real cases
Scars
Scars Scars
Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Solutions: Each source of scarring requires a different approach to help your plant recover. Protect the trunk and leaves from physical damage like scrapes. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Fruit withering
Fruit withering Fruit withering
Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Solutions: There are a number of appropriate solutions to control fruit withering: Remove any fruit as soon as it shows any signs of infection. Do not compost. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Brown spot
Brown spot Brown spot
Brown spot
This infection can cause brown spots or patches to appear on the plant.
Solutions: In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary. Organic options won’t kill the fungus, but will prevent it from spreading. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Plant dried up
Plant dried up Plant dried up
Plant dried up
The entire plant may dry out due to dieback or normal seasonal dormancy.
Solutions: The solution for a dried out plant depends on the cause, so determine the cause before selecting a treatment method. Adjust your watering: Stick your finger in the soil near the roots. If it feels bone dry or overly saturated, you need to adjust your watering frequency accordingly. Prune back dead foliage: Snip off any brown stems and leaves on the plant to make space for new growth. This encourages the roots to send up fresh stems. Move to a proper environment. This may involve decreasing or increasing sun exposure, depending on the species. Decrease fertilizer applications. If you have applied too much fertilizer, you can repot plants with fresh potting soil. Wait. If your plant has dried out as daylight is decreasing, it is entering dormancy. Decrease watering and wait until the plant resumes growth.
Low light
Low light Low light
Low light
A lack of sunlight will cause the stems and leaves to elongate and appear lighter in color.
Solutions: Low light can only be addressed by increasing light availability, and these measures will only stop further etoliation; current distortion cannot be reversed. Move plant to a position where it receives more light. Check the requirements for specific species, as too much sunlight can cause a plant to burn. Introduce appropriate artificial lighting. Some people choose to prune the longest stems so the plant can concentrate on healthy new growth under the improved lighting.
autodiagnose

Treat and prevent plant diseases.

AI-powered plant doctor helps you diagnose plant problems in seconds.
close
Scars
plant poor
Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Symptom Analysis
Symptom Analysis
Scars form when the plant repairs wounds. They can be the result of people or pets passing by and scraping the plant. Once the underlying issue is resolved, the plant will heal but a scar may remain.
Pests and pathogens can also cause scarring. Insects may attack the plant for a meal, resulting in extensive scarring when a few invaders turn into an infestation. Diseases such as fungus and bacteria can weaken the plant, causing brown spots, mushy areas, or blisters that lead to scars.
Scars occur on stems when a leaf or bud has been lost and the plant has healed. The harder tissue is like a scab that protects a wound.
On other occasions, scars can signal problems from environmental conditions, such as overexposure to sunlight or heat. It might surprise you to know that plants can suffer from sunburn, even desert dwellers like cactus!
Solutions
Solutions
Each source of scarring requires a different approach to help your plant recover.
  1. Protect the trunk and leaves from physical damage like scrapes.
  2. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray.
  3. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs.
  4. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Prevention
Prevention
Preventing some sources of scarring is easier than others, but all start with careful attention to your plants once you decide to bring them home.
  1. Review specific guidelines for your plant, including soil drainage, watering, and fertilizer requirements.
  2. Inspect plants before planting and use sterile pots and fresh potting soil or media to limit transfer of fungi or bacteria.
  3. Once established, check your plants regularly for signs of scarring or the presence of pests, as it is better to catch problems as early as possible.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Fruit withering
plant poor
Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Overview
Overview
Fruit withering is common on many tree fruits, including apples, pears, peaches, cherries, and plums, as well as fruiting shrubs. It is caused by a fungal pathogen and will result in wrinkled and desiccated fruit.
Symptom Analysis
Symptom Analysis
Here are the most common symptoms in the order that they are likely to occur.
  1. Both leaves and blossom on the tips of branches will go brown and wither.
  2. Gray powdery patches will appear on infected leaves and flowers, and this will be most apparent after rain.
  3. Any fruit that does appear will turn wrinkled and fail to develop.
  4. Branch tips begin to die, progressing back to larger branches, causing general deterioration of the tree or plant.
Disease Cause
Disease Cause
The withering is caused by one of two fungal pathogens, one called Monilina laxa and the other called M. fructigen. The spores overwinter on infected plant material and are then spread the following spring by wind, rain, or animal vectors. The problem will start to become noticeable in mid-spring, but will increase in severity as summer progresses and the fungus grows. If not addressed, the disease will intensify and spread to other plants in the vicinity.
Solutions
Solutions
There are a number of appropriate solutions to control fruit withering:
  1. Remove any fruit as soon as it shows any signs of infection. Do not compost.
  2. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Prevention
Prevention
Preventative measures include:
  1. Ensuring adequate spacing between plants or trees.
  2. Staking plants that are prone to tumbling to prevent moisture or humidity build up.
  3. Prune correctly so that there is adequate air movement and remove any dead or diseased branches that may carry spores.
  4. Practice good plant hygiene by removing fallen material and destroying it as soon as possible.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Brown spot
plant poor
Brown spot
This infection can cause brown spots or patches to appear on the plant.
Overview
Overview
Discolored spots on the foliage of plants are one of the most common disease problems people observe. These spots are caused by fungal and bacterial diseases, with most infections related to a fungal pathogen.
Brown spot can occurs on all houseplants, flowering ornamentals, vegetable plants, and leaves of trees, bushes, and shrubs. No plants are resistant to it, and the problem is worse in warm, wet environments. It can occur at any point in the life stage as long as leaves are present.
Small brownish spots appear on the foliage and enlarge as the disease progresses. In severe cases, the plant or tree is weakened when the lesions interrupt photosynthesis or cause defoliation.
Symptom Analysis
Symptom Analysis
In most cases, brown spot only affects a small percentage of the whole plant, appearing on a small amount of the leaves. A small infection only puts minor stress on the plant. However, if left untreated and the disease progresses over numerous seasons, it will severely impact the health and productivity of the infected specimen.
  • Sporulation begins (reproduction of the fungal spores), and tiny spots appear on leaves.
  • Placement is often random and scattered as diseases are spread through raindrops.
  • May appear on lower leaves and the interior of the plant where humidity is higher.
  • Brown spots enlarge and grow large enough to touch neighboring spots to form a more prominent blotch.
  • Leaf margins may turn yellow.
  • Tiny black dots (fruiting bodies of the fungi) appear in the dead spots.
  • Blotches grow in size until the entire leaf is brown.
  • The leaf falls off the plant.
Severe Symptoms
  • Partial or complete premature defoliation
  • Reduced growth
  • Increased susceptibility to pests and other diseases
Disease Cause
Disease Cause
Brown spot, or leaf spot, is a common descriptive term given to several diseases affecting the leaves of plants and trees. Around 85% of diseases exhibiting leaf spots are due to fungus or fungus-like organisms. Sometimes brown spot is caused by a bacterial infection, or insect activity with similar symptoms.
When conditions are warm and the leaf surfaces are wet, fungal spores being transported by wind or rain land on the surface and cling to it. They do not rupture the cell walls but grow in the space between the plant plasma membrane and the plant cell wall. As the spores reproduce, they release toxins and enzymes that cause necrotic spots (i.e., dead tissue) on the leaves, allowing the fungi to consume the products released when the cells degrade.
Solutions
Solutions
In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary.
Organic options won’t kill the fungus, but will prevent it from spreading.
  1. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear.
  2. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread.
  3. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Prevention
Prevention
Like many other diseases, it is easier to prevent brown spot than cure it, and this is done through cultural practices.
  • Clear fall leaves from the ground before winter to minimize places where fungi and bacteria can overwinter.
  • Maintain good air movement between plants through proper plant spacing.
  • Increase air circulation through the center of plants through pruning.
  • Thoroughly clean all pruning tools after working with diseased plants.
  • Never dispose of disease plant material in a compost pile.
  • Avoid overhead watering to keep moisture off of the foliage.
  • Keep plants healthy by providing adequate sunlight, water, and fertilizer.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Plant dried up
plant poor
Plant dried up
The entire plant may dry out due to dieback or normal seasonal dormancy.
Symptom Analysis
Symptom Analysis
Your plant has dried out and turned brown. It might be starting to wilt, with no noticeable green around the stems and leaves. Touch the leaves, and they may crinkle under your fingers.
Possible causes of a dried out plant include:
  1. Not enough water. A lack of water will lead to dry plant tissue.
  2. Too much water. Watering too much can lead to root rot which makes the plant struggle to take up water. Rotted, mushy roots are a sign of overeating.
  3. Entering dormancy. As perennial plants enter their resting period known as dormancy, their leaves dry out and may fall off. This happens during decreasing day length.
  4. Exposure to herbicides and other toxic substances. If a plant is hit with a large dose herbicide or other toxic chemical, the plant will turn brown.
  5. Too much fertility. An excess of fertilizer can prevent plants from taking up water, leading to drying.
  6. Improper sun exposure. Just like humans, plants can get sunburn by intense, direct light. Plants can also dry out if they don’t receive enough light.
To determine whether the plant is still alive and can be saved, you can:
  1. Bend a stem. If the stem is pliable, the plant is still alive. If the stem breaks, the plant is dead.
  2. Gently scratch the stem with your fingernail for signs of green inside. If your plant is dead, the stem will be brittle and brown throughout.
  3. Cut the stems back a little bit a time for visible green growth. If none of the stems have visible green growth, the plant is dead.
Solutions
Solutions
The solution for a dried out plant depends on the cause, so determine the cause before selecting a treatment method.
  1. Adjust your watering: Stick your finger in the soil near the roots. If it feels bone dry or overly saturated, you need to adjust your watering frequency accordingly.
  2. Prune back dead foliage: Snip off any brown stems and leaves on the plant to make space for new growth. This encourages the roots to send up fresh stems.
  3. Move to a proper environment. This may involve decreasing or increasing sun exposure, depending on the species.
  4. Decrease fertilizer applications. If you have applied too much fertilizer, you can repot plants with fresh potting soil.
  5. Wait. If your plant has dried out as daylight is decreasing, it is entering dormancy. Decrease watering and wait until the plant resumes growth.
Prevention
Prevention
Prevention involves providing your plant with the proper environment.
  1. Provide the proper amount of water. The amount of water depends on a plant’s size, species, and environment. A general rule is to allow soil to dry out between waterings.
  2. Place plants in the proper environment. Provide the proper hours of sun and temperature for your individual plant.
  3. Provide proper fertility. Most plants only need to be fertilized once or twice a year; don’t overapply.
  4. Keep plants free from toxic substances. Keep herbicides and toxic household chemicals away from your plants.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
Low light
plant poor
Low light
A lack of sunlight will cause the stems and leaves to elongate and appear lighter in color.
Overview
Overview
All plants require light, and if they do not receive it in the quantities that they require this distorts their growth in a process known as etiolation. In essence, etiolated plants are diverting all of their energy to growing taller in a desperate attempt to reach a position where they can meet their light requirements. Many other growth factors are harmed by this, and so light-deprived plants can become weak and distorted until they are almost unrecognizable. Low light symptoms are most commonly seen in houseplants, but outdoor specimens can also be affected.
Symptom Analysis
Symptom Analysis
Although symptoms will vary in different plants, the general symptoms of low light are easy to spot.
  1. Plant stems grow tall and lanky.
  2. There are less leaves, and both leaves and stems tend to be pale and insipid looking. This is due to a shortage of chlorophyll.
  3. All plant parts become weakened and may droop, as energy is diverted toward too-fast growth as the plant stretches itself toward any source of light.
Disease Cause
Disease Cause
Plants need sunlight in varying amounts for photosynthesis – a process that produces energy for growth and fruit and flower production. Low light causes a plant to divert all energy to upward (apical) growth in order to find better light. Plant hormones called auxins are transported from the actively-growing tip of the plant downwards, to suppress lateral growth. A drop in cellular pH triggers expansins, nonenzymatic cell wall proteins, to loosen cell walls and allow them to elongate. This elongation results in the abnormal lengthening of stems, especially internodes, or plant "legginess" which is observed in etoliated plants.
Solutions
Solutions
Low light can only be addressed by increasing light availability, and these measures will only stop further etoliation; current distortion cannot be reversed.
  • Move plant to a position where it receives more light. Check the requirements for specific species, as too much sunlight can cause a plant to burn.
  • Introduce appropriate artificial lighting.
  • Some people choose to prune the longest stems so the plant can concentrate on healthy new growth under the improved lighting.
Prevention
Prevention
To avoid etiolation, provide an adequate amount of light from the beginning.
  1. Choose a location that matches each plant's ideal light needs. Many indoor plants do best in or near a south-facing window, which will provide the longest hours of sunlight. Flowering plants and those with colored leaves typically need more light than purely-green plants, as photosynthesis occurs in the green portions of leaves.
  2. Select plants with light needs that match a location's conditions. Some cultivars and varieties require less light than others.
  3. Use a grow light. Darker locations may require artificial illumination. A grow light may also become more necessary during winter, when sunlit hours are at their shortest.
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
qrcode
Scan the QR code with your phone camera to download the app
care_more_info

More About Blue Cereus

Plant Type
Plant Type
Tree, Shrub
Lifespan
Lifespan
Perennial
Spread
Spread
91 to 762 cm
Bloom Time
Bloom Time
Early summer, Mid summer
Flower Color
Flower Color
White
Green

Name story

Lady of the night cactus
The alluring and slightly racy common name likely alludes to the fact that this is one of many night-blooming cacti. “Cereus” is derived from Greek and Latin words for “wax” or “candle”, a reference to the tall, columnar growth of these cacti. The stem is formed of six angles, hence the specific epithet “hexagonus”.
View More Info
plantfinder

Find your perfect green friends.

Plan your green oasis based on your criteria: plant type, pet safety, skill level, sites, and more.
care_faq

Common Problems

Why is its fleshy stem thinner and thinner as it grows?

more more
Thin stems may be caused by insufficient sunlight, insufficient water, or fertilizer deficiency. Move the pot to a brighter place, but avoid sunburn. Increase water and fertilizer.

How do I deal with root or stem rot?

more more
Excess water often leads to root and stem rot. Avoid accumulated water in soil. Prune rotten roots and stems and transplant to a new flowerpot in a well-ventilated place. The soil should be loose and air-permeable as far as possible.

Why doesn't my blue cereus ever bloom?

more more
Firstly, it may not be time for the plant to bloom. Time from seedling to blooming can range between 2-20 years or longer. Secondly, the plant may need more sunlight, temperature or fertilizer. Increase the exposure to sunlight and fertilizer appropriately, supplement the fertilizer with phosphorus and potassium, or purchase special fertilizer for promoting blooming of blue cereus.

Why does blue cereus turn yellow?

more more
Blue cereus turns yellow due to overwatering, insufficient sunlight, or pests. Blue cereus does not require much water, and excess water leads to root anoxia and root rot. Generally, it does not need to be watered often. Water it only when the soil is completely dry. Remember to drain the water in the flowerpot tray. Sunlight can be increased, but avoid direct exposure to blazing sunlight to prevent sunburn. Remove a small amount of pests with alcohol. For large infestations, spray pesticide.
plant

Botanist in your pocket

plant
plant plant
plant
plant

App

plant
close
product icon
Continue reading in our app - it's better
A database of 400,000+ plants and unlimited guides at your fingertips...
Your Ultimate Guide to Plants
Identify, grow, and nurture the better way!
product icon
17,000 local species +400,000 global species studied
product icon
Nearly 5 years of research
product icon
80+ scholars in botany and gardening
ad
ad
Botanist in your pocket
qrcode
PictureThis Ios Download PictureThis Android Download
Scan the QR code with your phone camera to download the app
close
title
Botanist in your pocket
qrcode
Scan QR code to download
app-store google-store
About
Basic Care
Advanced Care
Seasonal Tips
Pests & Diseases
More Info
FAQ
Blue cereus
Blue cereus
Blue cereus
Blue cereus
Blue cereus

How to care Blue Cereus

Blue cereus (Cereus hexagonus) is a tree-like cactus that can grow to 15 m tall. It has a grayish-green twisted stalk with thorns along the five ridges. It blooms from spring to summer with large white blossoms that open at night. Flowers are funnel-shaped and can be up to 25 cm long. Edible fruits are pale red and ripen in fall. Grows best in full sun with well-drained soil.
Sunlight
Sunlight
Full sun
care_basic_guide

Basic Care Guide

Cultivation:WaterDetail

Water

Cultivation:WaterDetail
Blue cereus is a drought-tolerant plant that does not require frequent watering. Water thoroughly when the soil is completely dry. When potted, water slowly, wait for water to flow out the bottom, and then pour the excess water from the tray to avoid water accumulation.
Spring, summer, and fall are its growing seasons. Water once or twice a week to keep the soil slightly wet. In winter, water less; just keep the soil from drying excessively; usually once a week. Besides, water with rainwater or distilled water rather than tap water.
Tap water contains a lot of calcium, magnesium, and other mineral salts. Long-term use tends to cause soil compaction. Avoid splashing water on its stem when watering to prevent rotting.
close

Water

Blue cereus is native to regions with arid temperatures, and it's important not to overwater them. This plant needs moderate moisture levels and minimal care, so it's important to know how to water it properly.
Potted Blue cereus
Blue cereus is very tolerant of drought. This means that you don't need to water them very often. Watering frequency should also depend on the climate where you live. Most of the time, you only need to water your succulents once every two to three weeks in the summer and spring. Another tip when watering this species is to water it from the bottom. This is for the proper absorption of water to the roots, enabling it to circulate the nutrients from the soil towards its whole body. When you accidentally spill water at the top part, this can cause the development of diseases and fungi. During the winter and fall, reduce the watering or avoid this as this plant tends to become dormant. You can cut back on watering or once every 21 to 28 days when it begins to cool down.
In humid locations, there's no need to water a lot. When keeping the Blue cereus indoors, you won't have to keep the moisture high, especially if the plant does not receive too much sunlight. When there's too much moisture and not enough light, this can spell disaster for the succulents.
Before you give this plant a drink, it's always a good idea to check the soil's moisture levels by poking your finger in it or using a moisture meter. This will tell you whether the soil is already too dry or if there's still moisture. It's a technique used by owners of smaller potted plants to know whether it's time to water or not.When they are fully grown, water them less since they can survive without water compared to when they were small. You need to give them time to get used to your climate and growing conditions before watering them. If they are indoors, keep them in indirect light and water them less frequently. Avoid using cold water during the winter and months, and you might be overwatering when the plants are located indoors.
Ground Blue cereus
Know that these plants can survive for weeks without any water. This is because they have water storage capacity that can conserve water for a long time. so it will conserve enough water to stay alive even if they are in the wild.
When they are planted outdoors, never water them lightly as this will result in more shallow root growth. Wait for a few weeks and only give them a drink when the soil around them is too dry. rainwater can be another excellent alternative when you want to hold back on watering. When you live in an area where you don't get much rain, water at least once every three weeks to prevent the soil from drying too much.
Underwater and overwater
When you're still in the process of buying a Blue cereus , make sure to ask first if the soil is properly draining or sandy. When the topsoil does not properly drain, there's a chance that the plant will likely not receive enough water in the future.
When you see that the Blue cereus begins to turn yellow, know that this can be caused by underwatering or overwatering. Also, the browning and dropping symptoms indicate that your plant is getting too much moisture and water. If there's not enough water, the indication can be seen with the yellow tips that can begin to form on stems and branches.
When the soil is too wet, then there might be the presence of fungal infections. You should allow everything to dry, and you should not overwater.You can see the squishy stems, drooping growth, and discolored parts that are all signs of too much moisture. It's critical to give the species time to recover and allow the pot to dry. Transfer it to a different container to avoid root rot and prevent it from dripping. If planted outside, you can also transfer it into a pot, especially in the winter, to help it recover.
Another thing is that the Blue cereus tends to die when it's constantly getting overwatered and if it's receiving too much rain if planted outside. Use rainwater or distilled water whenever possible as the plants don't like many minerals in their drink.
Show More
more
Unlock complete care guides for 10,000+ species
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
waterreminders

Never miss a care task again!

Plant care made easier than ever with our tailor-made smart care reminder.
What's the best method to water my Blue cereus?
more
Free
What should I do if I water my Blue cereus too much/too little?
more
lock
How often should I water my Blue cereus?
more
lock
How much water does my Blue cereus need?
more
lock
Show More more
Cultivation:FertilizerDetail

Fertilizer

Cultivation:FertilizerDetail
In growing seasons (namely spring, summer and fall), fertilize blue cereus once a month with liquid fertilizer. No fertilizer is required in winter. A small amount of slow-release fertilizer can be well mixed into the soil when repotting in spring or fall.
Use nitrogen fertilizer during seedling and phosphate-potassium fertilizer before and after blooming. The fertilizer concentration should be as low as possible. It would be better to apply low-concentrate fertilizer several times rather than to use a high concentration. If the base is yellow and grows slowly, the cause may be excessive fertilizer, and fertilization should be immediately stopped.
close

Fertilizer

Often found growing in rock gardens and used in xeriscaping, Blue cereus adds plenty of interest and texture to the area. It is a slow-growing plant, and this affects its care. Blue cereus does not require a lot of nutrients to thrive. Knowing when and how to feed your specimen will help ensure you get years of enjoyment from your plant. Fertilizing Blue cereus adds nutrients to the growing medium. Even though it does store water and nutrients, applying plant food during the growing season helps support healthy growth. Fertilizing can also encourage mature specimens to produce blooms in the growing season.
While all plants benefit from additional nutrients, Blue cereus only needs a light dose of fertilizer during the growing season. The frequency of fertilization should be 1-2 times a year. It is suggested to fertilize your Blue cereus in the spring and autumn, but not in winter&summer when it is dormant. Be careful with repotted plants, you will want to reduce the amount of fertilizer. It’s also a good idea to wait a couple of months after repotting before you start applying fertilizer. It’s best to use a liquid plant food formulated for succulents and cacti when you are fertilizing Blue cereus. Dilute the fertilizer with water to half-strength. You do not want the fertilizer building up in the soil. Apply the fertilizer to the base of the plant and water thoroughly, ensuring any excess moisture drains from the container or seeps into the ground.
It is easier to use liquid plant food when you are fertilizing Blue cereus, but granules are another option. Follow the directions on the packaging, making sure you dilute liquid fertilizers to half-strength. Whether you are using granules are liquid plant food, always apply it to the soil. Cover the granules with a thin layer of soil and water regardless of the type of plant food you are using.
Over-fertilizing Blue cereus is a common problem with new and experienced gardeners. The plant has low nutritional needs and it’s easy to apply a little too much fertilizer. Over-fertilizing Blue cereus can burn the plant’s sensitive roots resulting in its slow decay. Without its root system, the plant cannot absorb nutrients and moisture.
Like most plants, Blue cereus has a dormancy period and it is when you want to stop the applications of fertilizer. In the summer and winter, the plant ceases growing, and it is when you want to stop applying fertilizer. It’s also a good idea to cease fertilizing for the first couple of months after repotting in the spring.
Show More
more
Unlock complete care guides for 10,000+ species
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
Why do I need to fertilize my Blue cereus?
more
Free
When is the best time to fertilize my Blue cereus?
more
lock
When should I avoid fertilizing my Blue cereus?
more
lock
What type of fertilizer does my Blue cereus need?
more
lock
Show More more
Cultivation:SunlightDetail

Sunlight

Cultivation:SunlightDetail
Blue cereus is a heliophilic plant and needs sufficient sunlight for its growth and blooming. It can be placed on the outdoor balcony or in the garden without shade. However, long-time exposure to blazing sunlight should be avoided in hot summer, when it needs to be shaded or cooled a little to prevent high temperatures from damaging it.
lightmeter

Know the light your plants really get.

Find the best spots for them to optimize their health, simply using your phone.
How much sunlight does Blue cereus need to grow?
more
Free
What type of sunlight does Blue cereus need?
more
lock
Should I protect Blue cereus from sun exposure?
more
lock
What will happen if Blue cereus doesn't get enough sunlight?
more
lock
Show More more
Cultivation:PruningDetail

Pruning

Cultivation:PruningDetail
Blue cereus does not require much pruning. Remove withered flowers and branches so the plant uses nutrients on healthy growth.
care_advanced_guide

Advanced Care Guide

Cultivation:WaterAndHardinessDetail

Temperature

Cultivation:WaterAndHardinessDetail
Blue cereus is distributed throughout tropical, subtropical, and semi-desert regions with scarce rainfall, intense sunlight, and hot temperatures. The optimum temperature for growth is 20 to 35 ℃. Lower than 10 ℃ or higher than 35 ℃, growth slows and dormancy begins. The air humidity should not be too high and the environment should be well-ventilated. Avoid high humidity and accumulated water.
What's the ideal temperature for your Blue cereus?
more
Free
How should I adjust the temperature for my Blue cereus during different growing phases?
more
lock
How can I keep my Blue cereus warm in cold seasons?
more
lock
What happens to my Blue cereus when the temperature is too high or too low?
more
lock
Show More more
Cultivation:SoilDetail

Soil

Cultivation:SoilDetail
Blue cereus grows best in fertile, gravel-rich, water-permeable soil with a pH value of 6-7. The culture soil formula often used is 60% vermiculite + 20% coco coir or peat moss + 20% sandy soil. A small amount of organic potting soil can also be added. Lightweight culture media such as vermiculite can be added to improve the air permeability of the soil. Eggshell powder or vermicompost can also be added to increase the soil fertility.
Roots of blue cereus are very sensitive to oxygen deficiency. If the soil is poorly permeable to air and water, root rot can set in. It's easy to judge permeability: when watering, water should pass through the medium quickly, rather than stop at the soil surface and slowly seep down. Repot and loosen the soil every year to ensure the air permeability of the soil.
Cultivation:PropagationDetail

Propagation

Cultivation:PlantingDetail

Planting

Cultivation:HarvestDetail

Harvest

Cultivation:PropagationDetail
In addition to the seeding mentioned above, main propagation methods include division and grafting. To divide, cut off the tip or lateral branches of the stem with a knife and plant it in soil. After a period of time, many small shoots will grow up near the cut. When a shoot grows to proper size, it can be cut off and transplanted to form a new plant.
To graft, select a suitable rootstock. Cut the tip of the rootstock, such as the stem of pitahaya (Hylocereus undatus), and then put blue cereus, with its roots removed, in the center of the rootstock and fix it with a rope. After 1-2 weeks, the two parts grow together and the rope can be removed.
close

Propagation

If you want to get more plants, you can propagate them as follows.
The active growing season during the spring and summer is the best time to propagate Blue cereus. During this period, the plants are generating a lot of energy for new growth and should have plenty of stems that can be used for propagation. They can also recover from having cuttings taken during this season than during the slower autumn and winter seasons.
The following are what you need to prepare before propagation can take place.
  1. Sharp scissors or knife
  2. Diluted bleach solution or isopropyl alcohol to clean tools
  3. Pot(s) or nursery tray with drainage holes
  4. Special soil for succulents
  5. Clear plastic bag or a humidity dome for covering cuttings
  6. Rooting hormone (optional but recommended)
  7. Gardening gloves
Steps:
Step 1: Prepare containers by filling them with moistened planting material leaving about half an inch of space from the top of the container.
Step 2: Choose healthy parts for propagation. Cut off healthy stem nodes; the nodes should not be new growth, as this is not easy to succeed. You need to use a clean knife to break or cut off the stem intact at the node location.
Step 3: Leave them for 1-2 weeks, as you need to wait for the cut wounds to dry before taking cuttings. Dip the bottom end of the cutting into rooting powder (if using) according to the directions.
Step 4: Insert the stems into a loose, airy substrate, keeping them tilted, each about one-third of the way into the substrate. Water thoroughly once after planting, after which you need to wait until the soil is dry 2 inches under the surface before watering again.
Step 5: Place it in a location where the cuttings can get light but no direct sunlight, as this can be too intense for cuttings. Water occasionally and do not let the Blue cereus dry out.
Most species will begin to produce roots in about 3 weeks, After rooting, the plant will gradually grow new leaves, at which time you can start to harden off the Blue cereus. Hardening off involves gradually exposing the Blue cereus to more sunlight so that they have time to adjust before being moved permanently outside. Hardening off should usually take about 1 to 2 weeks depending on the outdoor conditions and the type of Blue cereus. After this period, Blue cereus can be planted in containers or directly in the ground.
Show More
more
Unlock complete care guides for 10,000+ species
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
Cultivation:PlantingDetail
Sow, plant, or repot in spring or fall when the temperature is 15 to 20 ℃ . Keep air humidity high when seeding. Use plastic film to cover the soil and remove it after the seeds germinate.
Use permeable clay flowerpots for potted plants. Too large a flowerpot accumulates water easily, while too small a flowerpot limits the development of roots. Before planting, expose soil to blazing sunlight and disinfect to kill pathogens.
If planted in the garden, blue cereus prefers an area with full sun and loose soil. Remove all weeds and replace the soil if needed to ensure good water permeability and avoid root rot. Wear gloves or use tongs when planting to prevent your fingers from getting pricked. You can also wrap the plant in a towel to help you move it.
Cultivation:HarvestDetail
Most fruits of blue cereus are edible. Pick the fruit when they turn red. Avoid food safety issues by confirming the species with experts. Wear gloves or use scissors and other tools to harvest.
care_seasonal_tips

Seasonal Care Tips

seasonal-tip

Seasonal Precautions

During peak growth in spring, summer, and fall, increase water and fertilizer. Avoid sunlight exposure in the heat of the summer. Spray water around the plant to cool it down when the temperature is too high, but avoid leaving water on the stem. Avoid water accumulation in the soil. In winter, water it as little as possible or not at all, and stop fertilizer.
more

Summer

more

Fall

more

Winter

Succulents like this plant are actively growing in the summer.

more
1
Keep an eye on soil moisture levels. Do not allow the soil to completely dry out.
more
2
Continue fertilizing every couple of weeks with all-purpose plant food.
more
3
The plant also requires plenty of sunlight during the day to encourage blooming.
more
4
Prune back the old flowers after blooming at the end of the summer.
more
5
While your plant is actively growing, you can also remove stems for propagation. Place the stem in fresh soil and lightly water it.

While your plant is starting to enter dormancy towards the end of fall, it's still growing for much of the season.

more
1
Continue watering and fertilizing on a regular schedule, but reduce both of these routines as the season winds down and begins reaching dormancy.
more
2
Use an all-purpose fertilizer and water the plant when the soil is dry; make sure to err on the side of dry soil rather than soggy soil.
more
3
Keep making sure your plant receives enough light during this time, particularly during the morning or evening hours, which will help the plant grow well.

During the cold winter months, the plant usually goes into a dormant state.

more
1
Reduce watering your plant in the winter to give it a rest and let it lie dormant. It’s best to keep the plant dry during this season, rather than risk it being soggy.
more
2
Make sure it receives an adequate amount of sunlight, typically in the morning or evening, although it’s not as urgent during dormancy.
more
3
Since these plants don't survive in freezing outdoor temperatures, keep them in sufficiently warm rooms indoors, away from drafts or cold windows.
more
4
For the most part, you can leave these hardy plants to themselves during these colder months.
care_pet_and_diseases

Common Pests & Diseases

Common issues for Blue cereus based on 10 million real cases
Scars
Scars Scars Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Solutions: Each source of scarring requires a different approach to help your plant recover. Protect the trunk and leaves from physical damage like scrapes. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Learn More more
Fruit withering
Fruit withering Fruit withering Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Solutions: There are a number of appropriate solutions to control fruit withering: Remove any fruit as soon as it shows any signs of infection. Do not compost. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Learn More more
Brown spot
Brown spot Brown spot Brown spot
This infection can cause brown spots or patches to appear on the plant.
Solutions: In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary. Organic options won’t kill the fungus, but will prevent it from spreading. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Learn More more
Plant dried up
Plant dried up Plant dried up Plant dried up
The entire plant may dry out due to dieback or normal seasonal dormancy.
Solutions: The solution for a dried out plant depends on the cause, so determine the cause before selecting a treatment method. Adjust your watering: Stick your finger in the soil near the roots. If it feels bone dry or overly saturated, you need to adjust your watering frequency accordingly. Prune back dead foliage: Snip off any brown stems and leaves on the plant to make space for new growth. This encourages the roots to send up fresh stems. Move to a proper environment. This may involve decreasing or increasing sun exposure, depending on the species. Decrease fertilizer applications. If you have applied too much fertilizer, you can repot plants with fresh potting soil. Wait. If your plant has dried out as daylight is decreasing, it is entering dormancy. Decrease watering and wait until the plant resumes growth.
Learn More more
Low light
Low light Low light Low light
A lack of sunlight will cause the stems and leaves to elongate and appear lighter in color.
Solutions: Low light can only be addressed by increasing light availability, and these measures will only stop further etoliation; current distortion cannot be reversed. Move plant to a position where it receives more light. Check the requirements for specific species, as too much sunlight can cause a plant to burn. Introduce appropriate artificial lighting. Some people choose to prune the longest stems so the plant can concentrate on healthy new growth under the improved lighting.
Learn More more
autodiagnose

Treat and prevent plant diseases.

AI-powered plant doctor helps you diagnose plant problems in seconds.
close
Scars
plant poor
Scars
Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.
Symptom Analysis
Symptom Analysis
Scars form when the plant repairs wounds. They can be the result of people or pets passing by and scraping the plant. Once the underlying issue is resolved, the plant will heal but a scar may remain.
Pests and pathogens can also cause scarring. Insects may attack the plant for a meal, resulting in extensive scarring when a few invaders turn into an infestation. Diseases such as fungus and bacteria can weaken the plant, causing brown spots, mushy areas, or blisters that lead to scars.
Scars occur on stems when a leaf or bud has been lost and the plant has healed. The harder tissue is like a scab that protects a wound.
On other occasions, scars can signal problems from environmental conditions, such as overexposure to sunlight or heat. It might surprise you to know that plants can suffer from sunburn, even desert dwellers like cactus!
Solutions
Solutions
Each source of scarring requires a different approach to help your plant recover.
  1. Protect the trunk and leaves from physical damage like scrapes.
  2. If pests or disease are the cause of scarring, isolate the plant from others to avoid further spread. Some pests can be removed with organic remedies such as a soft cloth and soapy water solution or diluted isopropyl alcohol spray.
  3. Stop sunburn by moving your plant away from direct sunlight and making sure it has the water it needs.
  4. Frequent leaf or bud loss may be due to insufficient light or nutrients.
Prevention
Prevention
Preventing some sources of scarring is easier than others, but all start with careful attention to your plants once you decide to bring them home.
  1. Review specific guidelines for your plant, including soil drainage, watering, and fertilizer requirements.
  2. Inspect plants before planting and use sterile pots and fresh potting soil or media to limit transfer of fungi or bacteria.
  3. Once established, check your plants regularly for signs of scarring or the presence of pests, as it is better to catch problems as early as possible.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
close
Fruit withering
plant poor
Fruit withering
Fungal infection or normal ripening can cause the fruit to dry out.
Overview
Overview
Fruit withering is common on many tree fruits, including apples, pears, peaches, cherries, and plums, as well as fruiting shrubs. It is caused by a fungal pathogen and will result in wrinkled and desiccated fruit.
Symptom Analysis
Symptom Analysis
Here are the most common symptoms in the order that they are likely to occur.
  1. Both leaves and blossom on the tips of branches will go brown and wither.
  2. Gray powdery patches will appear on infected leaves and flowers, and this will be most apparent after rain.
  3. Any fruit that does appear will turn wrinkled and fail to develop.
  4. Branch tips begin to die, progressing back to larger branches, causing general deterioration of the tree or plant.
Disease Cause
Disease Cause
The withering is caused by one of two fungal pathogens, one called Monilina laxa and the other called M. fructigen. The spores overwinter on infected plant material and are then spread the following spring by wind, rain, or animal vectors. The problem will start to become noticeable in mid-spring, but will increase in severity as summer progresses and the fungus grows. If not addressed, the disease will intensify and spread to other plants in the vicinity.
Solutions
Solutions
There are a number of appropriate solutions to control fruit withering:
  1. Remove any fruit as soon as it shows any signs of infection. Do not compost.
  2. Use a fungicide prior to leaf bud and then as per manufacturers instructions throughout the season.
Prevention
Prevention
Preventative measures include:
  1. Ensuring adequate spacing between plants or trees.
  2. Staking plants that are prone to tumbling to prevent moisture or humidity build up.
  3. Prune correctly so that there is adequate air movement and remove any dead or diseased branches that may carry spores.
  4. Practice good plant hygiene by removing fallen material and destroying it as soon as possible.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
close
Brown spot
plant poor
Brown spot
This infection can cause brown spots or patches to appear on the plant.
Overview
Overview
Discolored spots on the foliage of plants are one of the most common disease problems people observe. These spots are caused by fungal and bacterial diseases, with most infections related to a fungal pathogen.
Brown spot can occurs on all houseplants, flowering ornamentals, vegetable plants, and leaves of trees, bushes, and shrubs. No plants are resistant to it, and the problem is worse in warm, wet environments. It can occur at any point in the life stage as long as leaves are present.
Small brownish spots appear on the foliage and enlarge as the disease progresses. In severe cases, the plant or tree is weakened when the lesions interrupt photosynthesis or cause defoliation.
Symptom Analysis
Symptom Analysis
In most cases, brown spot only affects a small percentage of the whole plant, appearing on a small amount of the leaves. A small infection only puts minor stress on the plant. However, if left untreated and the disease progresses over numerous seasons, it will severely impact the health and productivity of the infected specimen.
  • Sporulation begins (reproduction of the fungal spores), and tiny spots appear on leaves.
  • Placement is often random and scattered as diseases are spread through raindrops.
  • May appear on lower leaves and the interior of the plant where humidity is higher.
  • Brown spots enlarge and grow large enough to touch neighboring spots to form a more prominent blotch.
  • Leaf margins may turn yellow.
  • Tiny black dots (fruiting bodies of the fungi) appear in the dead spots.
  • Blotches grow in size until the entire leaf is brown.
  • The leaf falls off the plant.
Severe Symptoms
  • Partial or complete premature defoliation
  • Reduced growth
  • Increased susceptibility to pests and other diseases
Disease Cause
Disease Cause
Brown spot, or leaf spot, is a common descriptive term given to several diseases affecting the leaves of plants and trees. Around 85% of diseases exhibiting leaf spots are due to fungus or fungus-like organisms. Sometimes brown spot is caused by a bacterial infection, or insect activity with similar symptoms.
When conditions are warm and the leaf surfaces are wet, fungal spores being transported by wind or rain land on the surface and cling to it. They do not rupture the cell walls but grow in the space between the plant plasma membrane and the plant cell wall. As the spores reproduce, they release toxins and enzymes that cause necrotic spots (i.e., dead tissue) on the leaves, allowing the fungi to consume the products released when the cells degrade.
Solutions
Solutions
In minor cases of brown spot, there isn’t any need to treat the disease. However, if much of the foliage is affected and defoliation occurs, the plant will benefit from getting rid of the infection. It is recommended to start by applying organic treatment options, working up to the more potent synthetic, chemical fungicides if necessary.
Organic options won’t kill the fungus, but will prevent it from spreading.
  1. Dissolve ½ teaspoon of baking soda and one teaspoon of liquid soap in a gallon of water. Using a spray bottle, spray on tops and bottoms of leaves until the mixture drips off. Repeat every two weeks until existing spots stop enlarging and new spots no longer appear.
  2. Spray a copper-based fungicidal soap on the leaves, coating the top and bottom leaf surfaces. Reapply as directed on the product label. Copper penetrates the leaf surface and prevents germination of spores so the fungus cannot spread.
  3. Apply an all-purpose fungicide to the entire plant, following the label instructions carefully.
Prevention
Prevention
Like many other diseases, it is easier to prevent brown spot than cure it, and this is done through cultural practices.
  • Clear fall leaves from the ground before winter to minimize places where fungi and bacteria can overwinter.
  • Maintain good air movement between plants through proper plant spacing.
  • Increase air circulation through the center of plants through pruning.
  • Thoroughly clean all pruning tools after working with diseased plants.
  • Never dispose of disease plant material in a compost pile.
  • Avoid overhead watering to keep moisture off of the foliage.
  • Keep plants healthy by providing adequate sunlight, water, and fertilizer.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
close
Plant dried up
plant poor
Plant dried up
The entire plant may dry out due to dieback or normal seasonal dormancy.
Symptom Analysis
Symptom Analysis
Your plant has dried out and turned brown. It might be starting to wilt, with no noticeable green around the stems and leaves. Touch the leaves, and they may crinkle under your fingers.
Possible causes of a dried out plant include:
  1. Not enough water. A lack of water will lead to dry plant tissue.
  2. Too much water. Watering too much can lead to root rot which makes the plant struggle to take up water. Rotted, mushy roots are a sign of overeating.
  3. Entering dormancy. As perennial plants enter their resting period known as dormancy, their leaves dry out and may fall off. This happens during decreasing day length.
  4. Exposure to herbicides and other toxic substances. If a plant is hit with a large dose herbicide or other toxic chemical, the plant will turn brown.
  5. Too much fertility. An excess of fertilizer can prevent plants from taking up water, leading to drying.
  6. Improper sun exposure. Just like humans, plants can get sunburn by intense, direct light. Plants can also dry out if they don’t receive enough light.
To determine whether the plant is still alive and can be saved, you can:
  1. Bend a stem. If the stem is pliable, the plant is still alive. If the stem breaks, the plant is dead.
  2. Gently scratch the stem with your fingernail for signs of green inside. If your plant is dead, the stem will be brittle and brown throughout.
  3. Cut the stems back a little bit a time for visible green growth. If none of the stems have visible green growth, the plant is dead.
Solutions
Solutions
The solution for a dried out plant depends on the cause, so determine the cause before selecting a treatment method.
  1. Adjust your watering: Stick your finger in the soil near the roots. If it feels bone dry or overly saturated, you need to adjust your watering frequency accordingly.
  2. Prune back dead foliage: Snip off any brown stems and leaves on the plant to make space for new growth. This encourages the roots to send up fresh stems.
  3. Move to a proper environment. This may involve decreasing or increasing sun exposure, depending on the species.
  4. Decrease fertilizer applications. If you have applied too much fertilizer, you can repot plants with fresh potting soil.
  5. Wait. If your plant has dried out as daylight is decreasing, it is entering dormancy. Decrease watering and wait until the plant resumes growth.
Prevention
Prevention
Prevention involves providing your plant with the proper environment.
  1. Provide the proper amount of water. The amount of water depends on a plant’s size, species, and environment. A general rule is to allow soil to dry out between waterings.
  2. Place plants in the proper environment. Provide the proper hours of sun and temperature for your individual plant.
  3. Provide proper fertility. Most plants only need to be fertilized once or twice a year; don’t overapply.
  4. Keep plants free from toxic substances. Keep herbicides and toxic household chemicals away from your plants.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
close
Low light
plant poor
Low light
A lack of sunlight will cause the stems and leaves to elongate and appear lighter in color.
Overview
Overview
All plants require light, and if they do not receive it in the quantities that they require this distorts their growth in a process known as etiolation. In essence, etiolated plants are diverting all of their energy to growing taller in a desperate attempt to reach a position where they can meet their light requirements. Many other growth factors are harmed by this, and so light-deprived plants can become weak and distorted until they are almost unrecognizable. Low light symptoms are most commonly seen in houseplants, but outdoor specimens can also be affected.
Symptom Analysis
Symptom Analysis
Although symptoms will vary in different plants, the general symptoms of low light are easy to spot.
  1. Plant stems grow tall and lanky.
  2. There are less leaves, and both leaves and stems tend to be pale and insipid looking. This is due to a shortage of chlorophyll.
  3. All plant parts become weakened and may droop, as energy is diverted toward too-fast growth as the plant stretches itself toward any source of light.
Disease Cause
Disease Cause
Plants need sunlight in varying amounts for photosynthesis – a process that produces energy for growth and fruit and flower production. Low light causes a plant to divert all energy to upward (apical) growth in order to find better light. Plant hormones called auxins are transported from the actively-growing tip of the plant downwards, to suppress lateral growth. A drop in cellular pH triggers expansins, nonenzymatic cell wall proteins, to loosen cell walls and allow them to elongate. This elongation results in the abnormal lengthening of stems, especially internodes, or plant "legginess" which is observed in etoliated plants.
Solutions
Solutions
Low light can only be addressed by increasing light availability, and these measures will only stop further etoliation; current distortion cannot be reversed.
  • Move plant to a position where it receives more light. Check the requirements for specific species, as too much sunlight can cause a plant to burn.
  • Introduce appropriate artificial lighting.
  • Some people choose to prune the longest stems so the plant can concentrate on healthy new growth under the improved lighting.
Prevention
Prevention
To avoid etiolation, provide an adequate amount of light from the beginning.
  1. Choose a location that matches each plant's ideal light needs. Many indoor plants do best in or near a south-facing window, which will provide the longest hours of sunlight. Flowering plants and those with colored leaves typically need more light than purely-green plants, as photosynthesis occurs in the green portions of leaves.
  2. Select plants with light needs that match a location's conditions. Some cultivars and varieties require less light than others.
  3. Use a grow light. Darker locations may require artificial illumination. A grow light may also become more necessary during winter, when sunlit hours are at their shortest.
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
care_more_info

More About Blue Cereus

Plant Type
Plant Type
Tree, Shrub
Lifespan
Lifespan
Perennial
Spread
Spread
91 to 762 cm
Bloom Time
Bloom Time
Early summer, Mid summer
Flower Color
Flower Color
White
Green

Name story

Lady of the night cactus
The alluring and slightly racy common name likely alludes to the fact that this is one of many night-blooming cacti. “Cereus” is derived from Greek and Latin words for “wax” or “candle”, a reference to the tall, columnar growth of these cacti. The stem is formed of six angles, hence the specific epithet “hexagonus”.
View More Info
plantfinder

Find your perfect green friends.

Plan your green oasis based on your criteria: plant type, pet safety, skill level, sites, and more.
care_faq

Common Problems

Why is its fleshy stem thinner and thinner as it grows?

more more
Thin stems may be caused by insufficient sunlight, insufficient water, or fertilizer deficiency. Move the pot to a brighter place, but avoid sunburn. Increase water and fertilizer.

How do I deal with root or stem rot?

more more
Excess water often leads to root and stem rot. Avoid accumulated water in soil. Prune rotten roots and stems and transplant to a new flowerpot in a well-ventilated place. The soil should be loose and air-permeable as far as possible.

Why doesn't my blue cereus ever bloom?

more more
Firstly, it may not be time for the plant to bloom. Time from seedling to blooming can range between 2-20 years or longer. Secondly, the plant may need more sunlight, temperature or fertilizer. Increase the exposure to sunlight and fertilizer appropriately, supplement the fertilizer with phosphorus and potassium, or purchase special fertilizer for promoting blooming of blue cereus.

Why does blue cereus turn yellow?

more more
Blue cereus turns yellow due to overwatering, insufficient sunlight, or pests. Blue cereus does not require much water, and excess water leads to root anoxia and root rot. Generally, it does not need to be watered often. Water it only when the soil is completely dry. Remember to drain the water in the flowerpot tray. Sunlight can be increased, but avoid direct exposure to blazing sunlight to prevent sunburn. Remove a small amount of pests with alcohol. For large infestations, spray pesticide.
product icon close
Your Ultimate Guide to Plants
Identify, grow, and nurture the better way!
PictureThis Ios Download PictureThis Android Download
product icon
17,000 local species +400,000 global species studied
product icon
Nearly 5 years of research
product icon
80+ scholars in botany and gardening
ad
product icon close
Continue reading in our app - it's better
A database of 400,000+ plants
unlimited guides at your fingertips...
PictureThis Ios Download PictureThis Android Download
Cookie Management Tool
In addition to managing cookies through your browser or device, you can change your cookie settings below.
Necessary Cookies
Necessary cookies enable core functionality. The website cannot function properly without these cookies, and can only be disabled by changing your browser preferences.
Analytical Cookies
Analytical cookies help us to improve our application/website by collecting and reporting information on its usage.
Cookie Name Source Purpose Lifespan
_ga Google Analytics These cookies are set because of our use of Google Analytics. They are used to collect information about your use of our application/website. The cookies collect specific information, such as your IP address, data related to your device and other information about your use of the application/website. Please note that the data processing is essentially carried out by Google LLC and Google may use your data collected by the cookies for own purposes, e.g. profiling and will combine it with other data such as your Google Account. For more information about how Google processes your data and Google’s approach to privacy as well as implemented safeguards for your data, please see here. 1 Year
_pta PictureThis Analytics We use these cookies to collect information about how you use our site, monitor site performance, and improve our site performance, our services, and your experience. 1 Year
Cookie Name
_ga
Source
Google Analytics
Purpose
These cookies are set because of our use of Google Analytics. They are used to collect information about your use of our application/website. The cookies collect specific information, such as your IP address, data related to your device and other information about your use of the application/website. Please note that the data processing is essentially carried out by Google LLC and Google may use your data collected by the cookies for own purposes, e.g. profiling and will combine it with other data such as your Google Account. For more information about how Google processes your data and Google’s approach to privacy as well as implemented safeguards for your data, please see here.
Lifespan
1 Year
Cookie Name
_pta
Source
PictureThis Analytics
Purpose
We use these cookies to collect information about how you use our site, monitor site performance, and improve our site performance, our services, and your experience.
Lifespan
1 Year
Marketing Cookies
Marketing cookies are used by advertising companies to serve ads that are relevant to your interests.
Cookie Name Source Purpose Lifespan
_fbp Facebook Pixel A conversion pixel tracking that we use for retargeting campaigns. Learn more here. 1 Year
_adj Adjust This cookie provides mobile analytics and attribution services that enable us to measure and analyze the effectiveness of marketing campaigns, certain events and actions within the Application. Learn more here. 1 Year
Cookie Name
_fbp
Source
Facebook Pixel
Purpose
A conversion pixel tracking that we use for retargeting campaigns. Learn more here.
Lifespan
1 Year
Cookie Name
_adj
Source
Adjust
Purpose
This cookie provides mobile analytics and attribution services that enable us to measure and analyze the effectiveness of marketing campaigns, certain events and actions within the Application. Learn more here.
Lifespan
1 Year
Download