Flower-of-an-hour (Hibiscus trionum) Flower, Leaf, Care, Uses

Average water needs, watering when the top 3 cm of soil has dried out.

Fertilization

Fertilization once a month during the growing season.

Pruning

Trim the dead, diseased, overgrown branches in winter.

Soil

Clay, Chalky, Neutral, Alkaline

Potting Suggestions

Mallows, rock-roses, and allies

Needs excellent drainage in pots

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Flower-of-an-hour

Water

Twice per week

Sunlight

Full sun

Planting Time

Spring

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Questions About Flower-of-an-hour

Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Flower-of-an-hour?

To water Flower-of-an-hour, you can use a garden hose with a spray nozzle, a watering can, or just about any other common watering tool. Generally, Flower-of-an-hour is not too picky about how they receive their water, as they can live off of rainwater, tap water, or filtered water. Often, you should try not to water this plant from overhead, as doing so can damage the leaves and flowers and may lead to disease as well. At times, the best method for watering this plant is to set up a drip irrigation system. These systems work well for Flower-of-an-hour as they apply water evenly and directly to the soil. For one Flower-of-an-hour that grows in a container, you can use a similar watering approach while changing the tools you use. To water a container-grown Flower-of-an-hour, use a cup, watering can, or your tap to apply water directly to the soil.

What should I do if I water my Flower-of-an-hour too much or too little?

The remedy for underwatering Flower-of-an-hour is somewhat obvious. When you notice that your plant lacks moisture, simply begin watering it on a more regular basis. The issue of overwatering can be a much more dire situation, especially if you fail to notice it early. When your Flower-of-an-hour is overwatered, it may contract diseases that lead to its decline and death. The best way to prevent this outcome is to choose a proper growing location, one that receives plenty of sunlight to help dry the soil and has good enough drainage to allow excess water to drain rather than pooling and causing waterlogged soils. If you overwater your Flower-of-an-hour that lives in a pot, you may need to consider changing it to a new pot. Your previous container may not have contained soil with good drainage or may not have had sufficient drainage holes. As you repot your overwatered Flower-of-an-hour, make sure to add loose soils and to use a pot that drains efficiently.

How often should I water my Flower-of-an-hour?

Flower-of-an-hour needs water regularly throughout the growing season. Beginning in spring, you should plan to water this plant about once per week. As the season presses on and grows warmer, you may need to increase your watering rate to about two to three times per week. Exceeding at this rate can be detrimental to your Flower-of-an-hour. With that said, you should also ensure that the soil in which your Flower-of-an-hour grows remains relatively moist but not wet, regardless of how often you must water to make that the case. Watering Flower-of-an-hour that lives in a pot is a bit different. Generally, you'll need to increase your watering frequency, as the soil in a pot can heat up and dry out a bit faster than ground soil. As such, you should plan to water a container-grown Flower-of-an-hour a few times per week in most cases, versus just once per week for an in-ground plant.

How much water does my Flower-of-an-hour need?

There are a few different ways you can go about determining how much water to give to your Flower-of-an-hour. Some gardeners choose to pick their water volume based on feeling the soil for moisture. That method suggests that you should water until you feel that the first six inches of soil have become moist. Alternatively, you can use a set measurement to determine how much to water your Flower-of-an-hour. Typically, you should give your Flower-of-an-hour about two gallons of water per week, depending on how hot it is and how quickly the soil becomes dry. However, following strict guidelines like that can lead to overwatering if your plant requires less than two gallons per week for whatever reason. When growing Flower-of-an-hour in a container, you will need to use a different method to determine how much water to supply. Typically, you should give enough water to moisten all of the layers of soil that have become dry. To test if that is the case, you can simply stick your finger in the soil to feel for moisture. You can also water the soil until you notice a slight trickle of excess water exiting the drainage holes of your pot.

How can I tell if i'm watering my Flower-of-an-hour enough?

It can be somewhat difficult to avoid overwatering your Flower-of-an-hour. On the one hand, these plants have relatively deep roots that require you to moisten the soil weekly. On the other hand, Flower-of-an-hour are plants that are incredibly susceptible to root rot. Along with root rot, your Flower-of-an-hour may also experience browning as a result of overwatering. Underwatering is far less likely for your Flower-of-an-hour as these plants can survive for a while in the absence of supplemental watering. However, if you go too long without giving this plant water, it will likely begin to wilt. You may also notice dry leaves.

How should I water my Flower-of-an-hour through the seasons?

You can expect your Flower-of-an-hour’s water needs to increase as the season moves on. During spring, you should water about once per week. Then, as the summer heat arrives, you will likely need to give a bit more water to your Flower-of-an-hour, at times increasing to about three times per week. This is especially true of Flower-of-an-hour that grow in containers, as the soil in a container is far more likely to dry out faster than ground soil when the weather is warm. In autumn, while your Flower-of-an-hour is still in bloom, it may need a bit less water as the temperature has likely declined, and the sun is no longer as strong as it was in summer.

How should I water my Flower-of-an-hour at different growth stages?

Flower-of-an-hour will move through several different growth stages throughout the year, some of which may require more water than others. For example, you will probably start your Flower-of-an-hour as a seed. While the seed germinates, you should plant to give more water than your Flower-of-an-hour will need later in life, watering often enough to maintain consistent soil moisture. After a few weeks, your Flower-of-an-hour will grow above the soil and may need slightly less water than at the seedling phase. Then, once this plant is mature, you can begin to use the regular watering frequency of about once per week. As flower development takes place, you may need to give slightly more water to aid the process.

What's the difference between watering Flower-of-an-hour indoors and outdoors?

There are several reasons why most Flower-of-an-hour grow outdoors rather than indoors. The first is that these plants typically grow to tall. The second reason is that Flower-of-an-hour needs more daily sunlight than most indoor growing locations can provide. If you are able to provide a suitable indoor growing location, you may find that you need to give your Flower-of-an-hour water a bit more often than you would in an outdoor growing location. Part of the reason for this is that indoor growing locations tend to be a lot drier than outdoor ones due to HVAC units. The other reason for this is that soil in containers can dry out relatively quickly as well compared to soil in the ground.

Is pruning necessary for my Flower-of-an-hour?

Flower-of-an-hour is a kind of annual plant so it doesn't need much pruning. You only need to cut off and clean the diseased, yellow or dropped leaves and stems during its growing period. This will help your Flower-of-an-hour to stay away from pathogens infection.

How do I prune my Flower-of-an-hour?

During the growth of the plant, yellowing, drying and spotted leaves are produced, and these spotted and discolored leaves need to be trimmed off. If the whole piece of leave is discolored or infected, you will need to cut it off completely. In other situations, you will only need to cut off the discolored or infected part on certain leaves. Flower-of-an-hour above the ground will die and dry up in the winter, and the dead plants need to be cleaned up.

Are there any cautions I should be careful with when pruning my Flower-of-an-hour?

Flower-of-an-hour leaves are delicate, so take care not to score or bruise them. Unless the leaves are withered or heavily discolored, do not prune the leaves from the lowermost branches unless they’re damaged. They typically grow the largest, so they supply the plant with critical energy to keep it growing right. Please prevent the wounds from water after pruning until they are fully recovered. Remember always sterilize the tools before pruning. When the pruning is finished, please throw all the waste leaves and stems into the trashbins to avoid diseases and bugs.

Are there any tips for pruning my Flower-of-an-hour?

Sterilize all the tools before pruning; unclean tools will pass pathogens to the plant through wounds;
Prune on sunny days because the new cuts will be infected by pathogens if they're distained by rain or water.
Throw all the waste leaves and stems into trashbins, they will easily rot and attract diseases and bugs

When should/shouldn't I prune my Flower-of-an-hour?

Expect to prune your Flower-of-an-hour every week if it’s growing well or every two weeks if it grows slowly. It is always good to prune it on sunny days because if you prune it on rainy days, the rainwater will distain the cuts and cause the whole plant to be infected.

What should I look for when pruning my Flower-of-an-hour in different seasons?

Because Flower-of-an-hour is an annual plant, the pruning should take place basically during the seasons that the plant grows rapidly. During the growth of the plant, yellowing, drying and spotted leaves are produced, and these spotted and discolored leaves need to be trimmed off.

How much sunlight should Flower-of-an-hour get per day to grow healthily?

You must expose the plants to at least 6 to 8 hours of sunlight daily. They prefer more exposure to the morning light, especially in the summer. The Flower-of-an-hour needs full sun and more sunlight that it can get. The more light these species get, the more they can manufacture food, produce beautiful blooms, and survive.

What type of sunlight does Flower-of-an-hour need?

The Flower-of-an-hour grows best under full sunlight. It's best not to crowd them together so they can get exposure to the sun evenly. The leaves shouldn't be starved with sunlight. If planted in pots, try to expose the herbaceous flowers in windows with direct sun and ensure they receive full sunlight regardless of the months.

They don't tend to do well in partial or filtered light as this will not produce strong stems and healthy flowers. It's best if the Flower-of-an-hour is always exposed to the sun.

Can sunlight hurt plants? How to protect Flower-of-an-hour from sun and heat damage?

When the temperature rises above 90℉(32℃), the Flower-of-an-hour can get damaged by extreme temperatures, especially if they are exposed to many hours of sun. It's always ideal for providing some shade from the light in the afternoon in the summer. It's always important to keep in mind that the sunlight in the summer is stronger than the one in the winter. Sunlight exposure is also 50% longer in the summer than in the winter.

If the Flower-of-an-hour is too stressed with sunlight, you might want to keep them fully hydrated. Water them when the top of the soil is about 2 inches dry, and move the plants indoors if it's too hot outside. This is the case if they are planted in containers.

It can be normal for the plant leaves to wilt during the day. Generally, they can recover at night. However, when you notice that the Flower-of-an-hour is still drooping, this means that the plant is losing water fast, and you need to water them.

Should I protect Flower-of-an-hour from sun exposure?

The Flower-of-an-hour does not need any protection from the sun. In fact, they love the sun, and some species are heliotropic. Plant them in south-facing gardens whenever possible so they can be exposed from morning to afternoon. While the sun can benefit them, some may experience a sunburn. You might offer protection from the afternoon and midday sun through a shade of a tree or a wall.

Growing the Flower-of-an-hour in shady areas is impossible because the larger flowers would require a lot of energy to grow and produce. Always provide the lighting conditions and set them in an area with full sun for best results.

What will happen if Flower-of-an-hour gets inadequate sunlight?

When the Flower-of-an-hour does not get adequate sunlight, or they are not placed in full sun locations, it's worth noting that the photosynthetic process will slow down. A lack of sunlight will cause the stems to become more leggy since they become thin and long since they tend to seek too much sunlight. They will not bloom and produce seeds in the shade.

Inadequate sunlight will also mean that the older leaves can die, the color of the new ones is lighter than the old foliage, and the new growth is smaller than the last ones.

The Flower-of-an-hour indeed loves the sun so much. However, they can wilt when exposed to excessive heat and ultraviolet light during the extreme summer months, so be careful. You might want to cover them with a net that has a green shade, especially in the summer, to prevent the leaves and the flowers from scorching. When they are indoors, reduce the heat with the help of a fan.

Does Flower-of-an-hour need special care about sunlight during its different growth stages?

When the Flower-of-an-hour is growing, they need more light than their mature counterparts. The younger ones should receive adequate light, but they might not be prepared for sudden full sunlight, especially if they are grown in a nursery. They can be more sensitive to the summer sun, so the lighting should be gradual and slow.

How much light does Flower-of-an-hour need for photosynthesis?

During summer or late spring, the Flower-of-an-hour needs 6 to 8 hours of direct light every single day. This is whether they are planted outdoors. If the Flower-of-an-hour is planted in pots or you're growing them in the winter, they need direct fluorescent lights that help them grow better. Make sure to place them in an indoor area where they are facing south or east so they can have enough sunlight for photosynthesis.

Are there any cautions or tips for sunlight and Flower-of-an-hour?

When transplanting the plants, they should not be exposed to sudden sunlight. Give the Flower-of-an-hour to grow and mature before transplanting outside. Some species of herbaceous plants can grow taller and might cast a shade on other young plants. Allow between 80 to 100 days of growing season before planting another batch to ensure that every plant receives more than enough sunlight for at least 6 hours a day.

Make sure that the Flower-of-an-hour receives the best light possible, especially if it's planted in a nursery. These are sun-loving plants, but too much sunlight with a very hot temperature is also detrimental to their growth. Indoor lights should be replaced with natural sunlight as much as possible since these species crave this every day.

What is the optimal temperature for Flower-of-an-hour?

The best temperature for Flower-of-an-hour depends on the time of year. There are two primary seasons to discuss for temperature: the growing season, and the dormancy season. During the growing season, once Flower-of-an-hour has begun to sprout, the ideal temperature range should be anywhere from 65~80℉(18~27℃). Any colder than 15℉(-10℃), and the plant will suffer; its leaves may brown and wilt, but if this is a short cold snap, then Flower-of-an-hour may be able to survive with some help.

During the warmer parts of the year, Flower-of-an-hour will need to be similarly protected from temperatures that are too high. 95-105℉ (35-40℃) is the top of this plant’s temperature range, and anything above that will compromise the integrity of the foliage and blooms of Flower-of-an-hour. Hotter temperatures can cause wilting, drooping, and even sunburn on the leaves, which can be difficult for Flower-of-an-hour to recover from. There are quite a few ways to combat this issue that are quick and easy!

Temperature requirements for first year or seedling Flower-of-an-hour

If this is the first year of your Flower-of-an-hour outside as a new plant, then it may need a little extra tending during the coldest months of the year. Not only can frost more severely damage a first-year Flower-of-an-hour, but it can also prevent it from growing back as a healthy plant come spring. This plant needs to be kept at 40℉(5℃) or above when they’re not yet established, which can be done either by bringing your Flower-of-an-hour inside for a month or two, or putting up mulch or fabric barriers that protect from frost damage.

It’s also a good idea to plant Flower-of-an-hour in a shadier spot during the first year or two, as smaller and weaker plants have a more difficult time maintaining their own temperatures in the heat. First-year Flower-of-an-hour should receive no more than five hours of direct sunlight per day, particularly if the ambient daytime temperature gets above 80℉(27℃). Shadecloth and frequent watering or misting are the keys to summer heat control.

How can I protect Flower-of-an-hour from extreme temperatures?

If cold temperatures (below 15℉(-10℃)) do occur during the growing season, there are a few measures you can take to help protect Flower-of-an-hour from frost or cold damage. If you’re growing Flower-of-an-hour in a container, then the container can simply be brought inside in bright, indirect light until the temperatures rise up over the lower threshold again. Another option that’s better suited for ground-planted Flower-of-an-hour is to use mulch or horticultural fabric to create an insulated barrier around the plant, which will protect the plant from frost and cold wind.

For temperatures that are hotter than 80℉(27℃) in the shade during the day, be careful to only expose Flower-of-an-hour to six hours or less of sunlight per day, preferably in the morning hours. Putting up shade cloth, or a fine plastic mesh, can help reduce the amount of direct sunlight that hits the plant during the hottest parts of the day. You can also install a misting system that allows for a slow release of cooling mist around the base of the plant during the day to lower ground temperatures.

Dormant season temperature recommendations for Flower-of-an-hour

During the cold winter months, Flower-of-an-hour needs a certain measure of cold in order to stay in dormancy until it’s time to sprout. Sprouting too early, that is before the danger of the last frost has passed, can be fatal to Flower-of-an-hour, especially if it’s already had a head start when the frost hits. Winter temperatures should ideally stay below 32℉(0℃), but if they get up to 40℉(5℃), everything will be just fine.

An unexpected warm spell during the cold months, which can happen in more temperate climates like woodland rainforests, can trigger a premature sprout from Flower-of-an-hour. In this case, if there’s still imminent danger of frost, you may want to try covering it with clear plastic on stakes so that the cold has less of a chance of damaging the new sprout. This setup can be removed when the danger of frost has passed. Occasionally, Flower-of-an-hour will be able to resprout at the correct time without any help, but this method increases the chances of a successful second sprouting.

Why do I need to fertilize my Flower-of-an-hour?

All plants need nutrients to grow, but some types are able to take what they need and don’t need any supplementation with fertilizers. Flower-of-an-hour, like other plants, use nutrients to support growth and all internal processes.

Each of the main nutrients that plants use (nitrogen, phosphorus, and potassium) contribute to one or more of a plant’s essential functions, and in the case of foliage it is nitrogen that provides the most support. It can be difficult for a Flower-of-an-hour to get enough nitrogen from the soil, which is why many gardeners prefer to supplement by feeding Flower-of-an-hour with a source of nitrogen.

When is the best time to fertilize my Flower-of-an-hour?

Flower-of-an-hour generally grows well, but a fertilizer can be applied about once a month to give the plant a boost when it is actively growing. You should fertilize Flower-of-an-hour about once a month only during the spring and summer months, but not during fall and winter when it becomes less active and does not use as many nutrients.

You’ll know when to start fertilizing Flower-of-an-hour if you see signs of new growth. The fertilization schedule remains the same whether the plant is grown outside or indoors in a container. However, if your Flower-of-an-hour is in a container, you probably will not need to fertilize for the first one to two months. Potting soil made for container plants already contains plenty of nutrients, so you should only start to fertilize after your plant has been in the same soil for a while.

When should I avoid fertilizing my Flower-of-an-hour?

Never fertilize your Flower-of-an-hour if it is not healthy, for example if it has developed a disease or has insect pests on it. Also do not fertilize a dehydrated plant, since the fertilizer will make this problem even worse. Only fertilize healthy plants.

Do not splash fertilizer onto the leaves or stem of this plant when watering, since it can cause burned spots. Be careful not to allow the fertilizer to make direct contact with the plant, unless you are usually a special fertilizer designed to be applied to the foliage.

What type of fertilizer does my Flower-of-an-hour need?

Fertilizers contain high levels of nitrogen, potassium and phosphorus, along with other essential nutrients such as iron, manganese and zinc. These are all necessary elements that promote growth in Flower-of-an-hour.

A balanced fertilizer works well for Flower-of-an-hour, for example an all-purpose fertilizer with a 10-10-10 NPK number. For natural fertilizers, blood meal or worm castings work well. You may also choose a fertilizer that is higher in nitrogen than other nutrients, such as fish fertilizer. Nitrogen provides support to leaves, which are the main feature that people want from Flower-of-an-hour. There is no point in providing a lot of supplements for flowers or seeds if that is not your purpose in growing the plant.

How do I fertilize my Flower-of-an-hour?

Apply fertilizer based on the instructions on the particular type you have purchased. It is generally a good idea to start with half-strength fertilizer to avoid accidentally over-fertilizing your Flower-of-an-hour. Since this plant requires frequent fertilization, it is common to accidentally fertilize too much. Remember that it’s always easier to add more fertilizer than it is to try to save an over-fertilized plant.

Don’t apply fertilizer to dry soil - it should already be at least somewhat moist before fertilizing. This helps the fertilizer absorb more easily and helps avoid fertilizer burn. You should also water after applying dry fertilizers to your soil.

Some fertilizers are meant to be mixed into the soil when planting, while others are applied on top of the soil and then watered in. For most types of Flower-of-an-hour, a water soluble fertilizer is an easy choice. Simply mix the fertilizer solution into your watering can at the recommended dosage for Flower-of-an-hour and then water the plant as usual. Slow-release granules or fertilizer spikes can also work well if you prefer not to remember to fertilize monthly.

What happens if I fertilize my Flower-of-an-hour too much?

Over-fertilization leads to a build-up of salts in the soil which leads to a lack of vitality overall and pale coloration in the leaves. Leaves may also wilt or develop brown tips as the excess salt from the fertilizer tries to make its way out of the leaves.

Too much fertilizer makes it impossible for the plant to take up water and nutrients, which will eventually kill it if you don’t take steps to save your Flower-of-an-hour. If the Flower-of-an-hour is in a container, you could either remove it from the pot and repot it in fresh potting mix, or flush out the soil by running a lot of water through and letting it drain out thoroughly.

If your Flower-of-an-hour is outdoors, the same theory applies, although it can be more difficult to flush outdoor soil. Water thoroughly and hold off on fertilizing again for a while. You may want to perform a soil test before you add any more fertilizer to make sure you don’t provide too much of any one nutrient.

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Common Pests & Diseases

Common issues for Flower-of-an-hour based on 10 million real cases

Aged yellow and dry

Natural aging can cause leaves to turn yellow and dry out.

Solutions: If the yellowing and drying of leaves and flowers is a natural progression due to age, nothing can be done to slow or stop the process. Once hormones within the plant begin the process of senescence, it’s irreversible.

Nutrient deficiencies

A lack of nutrients will cause a widespread yellowing of the leaves. The yellowing may begin at the base or top of the plant.

Solutions: There are several easy ways to remedy the nutrient deficiencies in soils. Use a water-soluble fertilizer. Fertilizers will include most or all of the macro and micro-nutrients the plants need to thrive. Adding some fertilizer to the soil will make those nutrients available and can combat deficiencies. Regularly apply organic fertilizer pellets. Organic fertilizers such as animal manures and bonemeal can supply plants with all the nutrients that they need to grow strong and healthy. Apply compost. Though not as finely tuned as artificial fertilizer, compost can nevertheless be rich in important nutrients and should be applied to the soil regularly. Apply nutrients via foliar application. In addition to supplementing the soil with nutrients, foliar fertilizer can be applied directly to the plant's leaves. Nutrients offered via foliar application are often taken up even quicker than those put in the soil, so the foliar application can be great for swiftly addressing specific deficiencies.

Caterpillars

Caterpillars are fleshy moth or butterfly larvae that come in an array of colors, patterns, and even hairstyles. They chew on leaves and flower petals, creating large, irregular holes.

Solutions: Even though caterpillars are diverse, they all chew on plant parts and can cause significant damage if present in large numbers. For severe cases: Apply insecticide. For an organic solution, spray plants with a Bacillus thuringiensis (Bt), which specifically affects the larval stage of moths and butterflies. Be sure to coat plants, since caterpillars need to ingest Bt for it to be effective. This will not harm other insects. Spray a chili extract. Chili seeds can be cooked in water to make a spicy spray that caterpillars don't like. Spray this mixture on the plants, but be aware it will also be spicy to humans. Introduce beneficial insects. Release beneficial insects to the garden that eat caterpillars, such as parasitic wasps. For less severe cases: Hand pick. Using gloves, pick off caterpillars on plants and dispose of them in a bucket of soapy water. Dust plants with diatomaceous earth. This powder is harmless to humans but irritates caterpillars. Therefore, it will make it difficult for caterpillars to move and eat.

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.

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Weed Control

Weeds

Flower-of-an-hour is a native south European annual introduced to the United States as an ornamental plant. It is an invasive species, listed as such in the states of Oregon and Washington, but it’s also legally cultivated by gardeners, which has aided its spread. The stems of flower-of-an-hour plants grow 61 cm in length. Its size is what makes the plant invasive. It will grow up fences, walls, and over native plants, eventually choking them out and even pulling fencing down. Problematically, flower-of-an-hour can also cause structural damage to buildings. It has a deep taproot that can be hard to completely remove.

How to Control it

Once weeds are flowering and firm, it is difficult to effectively control them, so the best time for weeds to be removed is before flowering and firming; once flowering and firming, the seeds will spread very quickly and need to be removed frequently, and prevention should be made in the next year. Seed stage: It can be covered with sawdust, crop straw or black opaque film, which can effectively inhibit seed germination and weed seedling growth. This method is generally used in winter or spring to inhibit weed seeds from germinating in the soil; if weeds are already flowering and firm, this method can be used to isolate the seeds from the soil and reduce the number of seeds that fall into the soil. Unplugging: Before weeds are strong, wear gloves or use tools to dig out weeds. If the soil is difficult to remove due to drought, it can be used to thoroughly remove the roots of weeds after being irrigated with water. After removal, it can be used in conjunction with deep cultivation to prevent weed roots from remaining. This method is particularly suitable for weeds at the seedling stage or with a relatively low size. Pruning: Pruning before weeds can effectively control the spread of weeds, especially for annual weeds. Frequent pruning can suppress the growth and fruiting of weeds, which can effectively remove weeds that year. Tillage: Tillage the soil before cultivation, pick up and discard perennial weed roots, expose to the sun, or bury it deeply. It can also be used to make organic fertilizer and compost with weeds. Chemical control: The weeds can be effectively removed by competing herbicides. Note: When removing weeds, you need to wear gloves to avoid direct contact between the body and the weeds, especially for some toxic, thorny, sensitive mucous weeds. When cleaning weeds during flowering, you need to wear a special mask to prevent allergies caused by inhaling pollen.

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Distribution Map

Habitat

Cultivated ground, waste places

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info

Plant Type

Herb

Flower Color

Yellow

White

Purple

Cream

Leaf Color

Green

Symbolism

Meanings

Usages

Garden Use

Grown for its beautiful but short-lived, pollinator-attracting flowers, the flower-of-an-hour plant also attracts gardeners with its ready reseeding and general hardiness. This plant is suitable for pollinator gardens, mixed flowerbeds, and most sizes of container.

Scientific Classification

Phylum

Vascular plants

Class

Dicotyledons

Order

Family

Mallow

Genus

Hibiscus

Species

Flower-of-an-hour

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Mouse-ear hawkweed (Pilosella officinarum) is a member of the daisy family from Europe and northern Asia. It has become invasive in North America, New Zealand, and Australia. Like many of its relatives, mouse-ear hawkweed tolerates heat and humidity quite well in spite of its northern origins.

Mountain tarweed

Mountain tarweed (Madia glomerata) is a resilient member of the aster family native to western North America. It has spread to the northeast portion of the continent semi-invasively as well. Resin within the plant's bristly stalks has a strong and unpleasant smell. It prefers relatively dry soils but is able to grow in damp ground on occasion.

Mountain groundsel

Mountain groundsel is a plant species belonging to the daisy family. It grows in forests and disturbed land and is considered a weed in parts of the United States. Its glandular hairs set it apart from its close relative, the common groundsel.

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Most Common Herb

Plant Collection Most Common Herb Fragrant plantain lily See More The trademark feature of Asia-native plantain lilies is the numerous glossy oval leaves with deep parallel veins. The Fragrant plantain lily is additionally decorated with strongly fragrant, trumpet-shaped, large white flowers, which are unique in the genus. Hosta plantaginea is one of the favorite cultivatedContinue reading “Most Common Herb”

Plant Collection Best Annual Plant to Grow Common sunflower See More The Common sunflower is recognizable for its bright flower on a very tall stem. It is often grown in gardens. These flowers have been important in culture: they were worshipped by the ancient Inca people, and today, they represent eco-friendly movements. The artist VincentContinue reading “Best Annual Plant to Grow”

Average water needs, watering when the top 3 cm of soil has dried out.

Most Common Herb

Plant Collection Most Common Herb Golden pothos See More The Golden pothos is a popular flowering house plant that’s commonly seen in Australia, Asia, and the West Indies. It goes by many nicknames, including “devil’s ivy,” because it is so hard to kill, and can grow in the dark. Golden pothos has poisonous sap, soContinue reading “Most Common Herb”

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Add to My Garden

Flower-of-an-hour

Hibiscus trionum

Also known as: Bladder weed, Puarangi, Venice mallow

Spring

Planting Time

Weeds

Care Guide for Flower-of-an-hour

Water

Fertilization

Fertilization once a month during the growing season.

Pruning

Trim the dead, diseased, overgrown branches in winter.

Soil

Clay, Chalky, Neutral, Alkaline

Potting Suggestions

Needs excellent drainage in pots

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Questions About Flower-of-an-hour

Watering

Pruning

Sunlight

Temperature

Fertilizing

What is the best way to water my Flower-of-an-hour?

What should I do if I water my Flower-of-an-hour too much or too little?

How often should I water my Flower-of-an-hour?

How much water does my Flower-of-an-hour need?

How can I tell if i'm watering my Flower-of-an-hour enough?

How should I water my Flower-of-an-hour through the seasons?

How should I water my Flower-of-an-hour at different growth stages?

What's the difference between watering Flower-of-an-hour indoors and outdoors?

Is pruning necessary for my Flower-of-an-hour?

How do I prune my Flower-of-an-hour?

Are there any cautions I should be careful with when pruning my Flower-of-an-hour?

Are there any tips for pruning my Flower-of-an-hour?

When should/shouldn't I prune my Flower-of-an-hour?

What should I look for when pruning my Flower-of-an-hour in different seasons?

How much sunlight should Flower-of-an-hour get per day to grow healthily?

What type of sunlight does Flower-of-an-hour need?

Can sunlight hurt plants? How to protect Flower-of-an-hour from sun and heat damage?

Should I protect Flower-of-an-hour from sun exposure?

What will happen if Flower-of-an-hour gets inadequate sunlight?

Does Flower-of-an-hour need special care about sunlight during its different growth stages?

How much light does Flower-of-an-hour need for photosynthesis?

Are there any cautions or tips for sunlight and Flower-of-an-hour?

What is the optimal temperature for Flower-of-an-hour?

Temperature requirements for first year or seedling Flower-of-an-hour

How can I protect Flower-of-an-hour from extreme temperatures?

Dormant season temperature recommendations for Flower-of-an-hour

Why do I need to fertilize my Flower-of-an-hour?

When is the best time to fertilize my Flower-of-an-hour?

When should I avoid fertilizing my Flower-of-an-hour?

What type of fertilizer does my Flower-of-an-hour need?

How do I fertilize my Flower-of-an-hour?

What happens if I fertilize my Flower-of-an-hour too much?

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Common Pests & Diseases

Common issues for Flower-of-an-hour based on 10 million real cases

Aged yellow and dry

Natural aging can cause leaves to turn yellow and dry out.

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Nutrient deficiencies

A lack of nutrients will cause a widespread yellowing of the leaves. The yellowing may begin at the base or top of the plant.

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Caterpillars

Caterpillars are fleshy moth or butterfly larvae that come in an array of colors, patterns, and even hairstyles. They chew on leaves and flower petals, creating large, irregular holes.

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Brown spot

This infection can cause brown spots or patches to appear on the plant.

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Weed Control

Weeds

How to Control it

Do you have weeds in your garden?

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Distribution Map

Habitat

Cultivated ground, waste places

Map

Native

Cultivated

Invasive

Potentially invasive

Exotic

No species reported

More Info

Plant Type

Herb

Flower Color

Yellow

White

Purple

Cream

Leaf Color

Green

Symbolism

Meanings

Usages

Garden Use

Scientific Classification

Phylum

Vascular plants

Class

Dicotyledons

Order

Mallows, rock-roses, and allies

Family

Mallow

Genus

Hibiscus

Species

Flower-of-an-hour

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Related Plants

New Zealand hebe

Veronica speciosa

Narrow-leaved vetch

Vicia sativa subsp. nigra

Myrtle-leaf milkwort

Polygala myrtifolia

Mouse-ear hawkweed

Pilosella officinarum

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