Fairy castle cactus (Cereus tetragonus 'Fairy Castle') Flower, Leaf, Care, Uses

Fairy castle cactus should be watered when the soil has dried out. Give a good soaking before allowing it to drain. Re-water when the soil has dried out again. During the winter months, it is not necessary to give a lot of water. Overwatering will damage the plant.

Fertilization

Fairy castle cactus should be fertilized during the spring with a cactus fertilizer. Feed monthly with a water soluble cacti fertilizer until the winter, when the succulent does not require further feeding.

Soil

Sand, Loam, Alkaline

Potting Suggestions

Flower Pots

Sunlight

Don't be mistaken by the innocuous appearance of the white fig (Ficus virens), because it's a killer. It belongs to the family of strangler figs which are able to germinate on another tree and then grow around and eventually kill it. Often the tree displays long dangling roots that hang impressively from branches.

Full sun, Partial sun

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Fairy castle cactus

Water

Every 3 weeks

Sunlight

Full sun

Hardiness Zones

9 to 12

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Questions About Fairy castle cactus

Watering

Sunlight

Temperature

Fertilizing

What should I do if I water my Fairy castle cactus too much or too little?

Underwatered Fairy castle cactus

Fairy castle cactus and other succulents can endure long periods without water, so it’s unusual to find one of these suffering from underwatering. But, if you somehow forgot about your plant and neglected to water it for a month or more, you’ll probably find your Fairy castle cactus looking thirsty or with some leaf damage from lack of watering.

It is very easy to identify an underwatered Fairy castle cactus. The leaves will look shriveled, dry, and flat. Some may have dried up completely, turned brown and crispy, or dropped off the plant, starting with the lower leaves and moving upward as the dry conditions continue. And of course, the soil will be completely dried out.

If your Fairy castle cactus is thirsty and underwatered, give it plenty of water as soon as possible. Submerging the pot entirely in water for about 5-10 minutes is a good way to make sure the soil and plant are rehydrated properly. When you feel a sense of moisture on the surface of the soil with your finger, it means the watering is done properly. If there are dried out leaves still attached, go ahead and pluck them off to make room for new growth.

Overwatered Fairy castle cactus

Overwatering is dangerous to Fairy castle cactus and can be fatal to your plant if you don’t remedy the situation. Too much moisture over time leads to root rot, which prevents the roots from being able to absorb nutrients and water from the soil. Root rot occurs when wet conditions allow fungi and bacteria to flourish in the soil and feed on roots. When you find that it's overwatered, you'd better change the growing conditions, place it somewhere with more air ventilation and adjust water frequency, for example.

The symptoms of overwatering are yellow, swollen, and translucent leaves that may even burst open from being over-full with water. If the problem continues without being treated, leaves might turn brown or black, and fall off the plant at the slightest touch. Be sure to check the soil to determine if overwatering is the culprit, as some other issues can cause similar symptoms.

It’s a bit difficult (but not impossible) to save an overwatered plant. The key is catching it early before a lot of damage has occurred. If the roots become rotten, it is likely to kill the entire plant. If you suspect you have overwatered your Fairy castle cactus, the first step is to remove it from its pot and check the roots and soil.

After removing the plant from its pot, gently remove wet soil from around the roots and then rinse them clean in room-temperature water. This helps with removing fungus that might be lurking in the soil and allows you to get a better sense of how healthy the roots are. If your plant has already developed root rot, you will see roots that are dark brown or black, soft, mushy, or slimy.

If the majority of the roots are already affected by root rot, it may not be possible to save the plant. In this case, it is best to remove any healthy leaves and try to use these to propagate a new Fairy castle cactus. Luckily, this plant is easy to propagate even from a single leaf. If, on the other hand, only a portion of the roots have succumbed to rot and other healthy roots still remain, there is a chance it can be saved.

Use a sterilized cutting tool to remove any unhealthy-looking roots. Once you're left with only the firm, pale roots, it’s a good idea to dip them in a fungicide to kill off any remaining spores. After that you can repot your Fairy castle cactus in fresh, free-draining potting soil. While this does not always work to save a succulent with root rot, in most cases this plant will be able to make a full recovery and will put out new growth starting in the next growing season.

How often should I water my Fairy castle cactus?

There’s not a hard-and-fast rule for how often to water Fairy castle cactus. The best way to determine this is to check the soil and only water when it’s bone dry. You can either stick your finger in the pot or use a moisture meter to check the soil below the surface. When you plant it in a deep pot, you can do this with a stick or chopstick. If it feels even a little bit moist, wait a few days and check it again.

Most people will need to water Fairy castle cactus about every two weeks in summer and once a month in winter, but there are several factors that can change the frequency. The section below lists some considerations that can help you to determine how often to water.

What should I consider when watering my Fairy castle cactus?

There are several environmental conditions that will affect how your Fairy castle cactus needs to be watered, including the container size, soil type, temperature, and humidity.

First off, the container and soil you use will determine how often to water and how much water to use each time. Be sure you use a container with plenty of drainage holes in the bottom so extra water can escape the pot. A small container has less room for soil, meaning it won’t hold as much moisture, while a larger pot will stay wet longer and need to be watered less often. It’s important not to keep your Fairy castle cactus in an oversized pot as this can easily lead to overwatering. When repotting, move to just one size larger than the current container. A shallow container works better than a deep one, since Fairy castle cactus has shallow root systems.

Fairy castle cactus will need to be watered less often in winter and more often in the active growing season in spring and autumn. During the winter, growth slows down considerably and the plant isn’t using much energy or water. There is less water lost to evaporation in cooler winter air, meaning that soil stays wet for much longer than it would in the summer.

This also applies to the general climate around your home. If you live in a humid location with a lot of rain, you will need to water less often than if you live in a dry, arid climate. Remember that conditions at the same geographic location can vary significantly with the season and the use of indoor heating and air conditioning.

Outdoor Planting

If Fairy castle cactus is planted in the ground, after establishing a root system, it shouldn’t need supplemental water beyond what it receives through precipitation and dew. But if there is a long dry period, you may want to water occasionally. In other areas where Fairy castle cactus can only be grown in a container, this plant can be moved outside in the spring and summer when the temperature is proper and then brought back inside when temperatures start to drop. A potted Fairy castle cactus kept outside usually needs more water than the same plant kept indoors, because there is a lot more sun exposure even on a shaded porch.

How to water Fairy castle cactus?

The best way to water Fairy castle cactus is to soak it thoroughly and then allow it to dry out before it gets watered again. Since this plant is somewhat drought tolerant, you can let it get quite dry before watering again. It is always better to give this type of plant too little water over too much.

When you water, make sure the soil gets thoroughly soaked throughout the whole pot. Don’t pour the water in just one spot, but rather try to go around the whole rim of the planter to be sure that it has a chance to get wet on all sides of the plant. The correct amount of water will depend on the size of your container and how much water your soil absorbs. Give your Fairy castle cactus enough water that it drains out from the drainage holes and then (ideally) leave the drained water in the saucer for about 20-30 minutes to absorb into dry pockets of soil. After that, discard any excess water that’s still in the saucer to avoid the soil getting waterlogged.

Bottom-watering is also an excellent method for the Fairy castle cactus, as you can be sure that the soil gets thoroughly moistened. This process involves placing the pot into a saucer of water and allowing the soil to absorb moisture through the drainage holes. You will know that the soil has absorbed enough water when the top layer is moist. This takes a bit more time than top-watering, but is almost foolproof in getting an even distribution of water throughout the pot.

The original habitat of Fairy castle cactus is relatively dry with little rain, but when it rains, the soil will be thoroughly moistened. So you can mimic this situation by bottom-watering your plant when the soil is totally dry. Deep soil bathing is better than frequent light watering for Fairy castle cactus.

How much sunlight does Fairy castle cactus need to grow?

Fairy castle cactus 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 Fairy castle cactus will get too much sunlight. They do fine with up to 14 hours of sun per day.

What type of sunlight does Fairy castle cactus need?

Fairy castle cactus 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.

Should I protect Fairy castle cactus from sun exposure?

Fairy castle cactus 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 Fairy castle cactus 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 Fairy castle cactus will be fine in full sun and don't need protection.

What will happen if Fairy castle cactus doesn't get enough sunlight?

Without enough sunlight, Fairy castle cactus will fail to thrive and grow. Common symptoms of inadequate sunlight include pale coloring, wilting leaves, and leaf drop. Fairy castle cactus 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.

What will happen if Fairy castle cactus gets too much sunlight?

Fairy castle cactus 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, Fairy castle cactus 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.

Does Fairy castle cactus need special care about sunlight during its different growth stages?

As with most plants, younger Fairy castle cactus 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.

Are there any cautions or tips for sunlight and Fairy castle cactus?

It is best to water Fairy castle cactus 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.

Fairy castle cactus 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 Fairy castle cactus 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.

What's the ideal temperature for your Fairy castle cactus?

It is more suitable to keep the Fairy castle cactus 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 Fairy castle cactus. You can even move it indoors as it will have better protection from the extremes.

Despite that, the Fairy castle cactus 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.

How should I adjust the temperature for my Fairy castle cactus during different growing phases?

Fairy castle cactus 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 Fairy castle cactus from indoors to sunlight during the hot summer months to receive enough sunlight.

How can I keep my Fairy castle cactus warm in cold seasons?

It's advisable to bring your Fairy castle cactus 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 Fairy castle cactus thriving in winter. If you have several Fairy castle cactus, then keep them rotating so that they all receive enough sunlight.

Avoid placing your Fairy castle cactus 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.

What happens to my Fairy castle cactus when the temperature is too high or too low?

Your Fairy castle cactus 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. Fairy castle cactus do well in temperate climates having temperatures between 75-90℉ (25-32℃). However, some gardeners can expose their Fairy castle cactus 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 Fairy castle cactus, you must be careful when trying out such experiment. During the hot summer season extremely high temperatures can burn your Fairy castle cactus 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.

How should I adjust the temperature for my Fairy castle cactus in different seasons?

In summers, high temperatures make the growth of Fairy castle cactus slowed down to survive in too hot a temperature.

As the cooler periods and rainfall begins, the Fairy castle cactus 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 Fairy castle cactus grow more in summer and rest in winter. It is because there is not enough sunlight for Fairy castle cactus to grow in winter.

You can help your Fairy castle cactus enter dormancy if you live in a place with cold temperatures by decreasing the temperature to 50℉ to 75℉ (15℃ to 25℃).

How can I keep my Fairy castle cactus warm without a heating pad?

To withstand freezing temperatures outside, as a solution, you can insulate your Fairy castle cactus with frost cloths, row covers, tents etc. You can also mulch your Fairy castle cactus with small rocks. Mulching the Fairy castle cactus soil will provide warmth to your plants and will not let you over-water the plant.

How can I protect my Fairy castle cactus from temperature damage?

Fairy castle cactus is adapted to sunlight and requires sufficient sunlight for healthy growth. You can place it in an outdoor environment without any shade. However, Fairy castle cactus 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 Fairy castle cactus indoors to keep them away from frost.

What are the tips and precautions for keeping my Fairy castle cactus 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.

Why do I need to fertilize my Fairy castle cactus?

Fertilizing Fairy castle cactus 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.

When is the best time to fertilize my Fairy castle cactus?

While all plants benefit from additional nutrients, Fairy castle cactus 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 Fairy castle cactus 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.

When should I avoid fertilizing my Fairy castle cactus?

Like most plants, Fairy castle cactus 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.

What type of fertilizer does my Fairy castle cactus need?

It’s best to use a liquid plant food formulated for succulents and cacti when you are fertilizing Fairy castle cactus. 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.

How do I fertilize my Fairy castle cactus?

It is easier to use liquid plant food when you are fertilizing Fairy castle cactus, 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.

What happens if I fertilize my Fairy castle cactus too much?

Over-fertilizing Fairy castle cactus 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 Fairy castle cactus can burn the plant’s sensitive roots resulting in its slow decay. Without its root system, the plant cannot absorb nutrients and moisture.

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Common Pests & Diseases

Common issues for Fairy castle cactus based on 10 million real cases

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.

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

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.

Stem rot

Bacterial infection can cause the stems to become soft and rotten.

Solutions: If the plant is only infected a little, it can sometimes be saved. This mainly applies to houseplants that are grown in pots. Here's what to do. Remove the plant from the pot and gently shake off as much soil as possible. Using pruning tools that have been disinfected, remove any diseased foliage and roots. Be sure the new pot has good drainage holes and wash it with one part bleach and nine parts water to ensure that it is completely clean and sanitized. Dip the plant's roots in fungicide to kill off any remaining fungal spores before potting into the clean growing medium. Only water the plant when the top inch of the soil is dry and never let the plant sit in water. For plants that are grown in the ground, it's best just to remove the infected plants and destroy them. Do not plant in the same spot until the soil has been allowed to dry out and has been treated with a fungicide.

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More Info

Plant Type

Succulent, Shrub

Flower Color

White

Yellow

Pink

Purple

Bloom Time

Summer

Usages

Garden Use

Fairy castle cactus is an attractive and easy-to-care-for succulent. Indoor gardeners will fair well with this low-maintenance and compact potted plant. Outdoors, this succulent will do well in dry succulent gardens, desert gardens as well as xeriscapes, and similar environments.

Scientific Classification

Phylum

Vascular plants

Class

Dicotyledons

Order

Pinks, cacti, and allies

Family

Cactuses

Genus

Cereus

Species

Fairy castle cactus

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Add to My Garden

Fairy castle cactus

Cereus tetragonus 'Fairy Castle'

Fairy castle cactus is a miniature Cereus tetragonus 'Fairy Castle' that grows as clumps of columnar spires that resemble a castle’s turrets. A spiny succulent that grows slowly and blooms only infrequently, it is an extremely popular choice for indoor growing in full-sun locations.

9 to 12

Hardiness Zones

Care Guide for Fairy castle cactus

Full sun, Partial sun

Know the light your plants really get.

Find the best spots for them to optimize their health, simply using your phone.

Download the App

Questions About Fairy castle cactus

Watering

Sunlight

Temperature

Fertilizing

What should I do if I water my Fairy castle cactus too much or too little?

Underwatered Fairy castle cactus

Overwatered Fairy castle cactus

How often should I water my Fairy castle cactus?

What should I consider when watering my Fairy castle cactus?

There are several environmental conditions that will affect how your Fairy castle cactus needs to be watered, including the container size, soil type, temperature, and humidity.

Outdoor Planting

How to water Fairy castle cactus?

How much sunlight does Fairy castle cactus need to grow?

What type of sunlight does Fairy castle cactus need?

Should I protect Fairy castle cactus from sun exposure?

What will happen if Fairy castle cactus doesn't get enough sunlight?

What will happen if Fairy castle cactus gets too much sunlight?

Does Fairy castle cactus need special care about sunlight during its different growth stages?

Are there any cautions or tips for sunlight and Fairy castle cactus?

What's the ideal temperature for your Fairy castle cactus?

How should I adjust the temperature for my Fairy castle cactus during different growing phases?

How can I keep my Fairy castle cactus warm in cold seasons?

What happens to my Fairy castle cactus when the temperature is too high or too low?

How should I adjust the temperature for my Fairy castle cactus in different seasons?

How can I keep my Fairy castle cactus warm without a heating pad?

How can I protect my Fairy castle cactus from temperature damage?

What are the tips and precautions for keeping my Fairy castle cactus at the right temperature?

Why do I need to fertilize my Fairy castle cactus?

When is the best time to fertilize my Fairy castle cactus?

When should I avoid fertilizing my Fairy castle cactus?

What type of fertilizer does my Fairy castle cactus need?

How do I fertilize my Fairy castle cactus?

What happens if I fertilize my Fairy castle cactus too much?

Get tips and tricks for your plants.

Keep your plants happy and healthy with our guide to watering, lighting, feeding and more.

Download the App

Common Pests & Diseases

Common issues for Fairy castle cactus based on 10 million real cases

Scars

Any light-colored markings that appear on stems but which do not enlarge or multiply are simply scars that have healed.

Learn More

Plant dried up

The entire plant may dry out due to dieback or normal seasonal dormancy.

Learn More

Low light

A lack of sunlight will cause the stems and leaves to elongate and appear lighter in color.

Learn More

Stem rot

Bacterial infection can cause the stems to become soft and rotten.

Learn More

Treat and prevent plant diseases.

AI-powered plant doctor helps you diagnose plant problems in seconds.

Download the App

More Info

Plant Type

Succulent, Shrub

Flower Color

White

Yellow

Pink

Purple

Bloom Time

Summer

Usages

Garden Use

Scientific Classification

Phylum

Vascular plants

Class

Dicotyledons

Order

Pinks, cacti, and allies

Family

Cactuses

Genus

Cereus

Species

Fairy castle cactus

Find your perfect green friends.

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

Download the App

Related Plants

# Useful Tips