If your hibiscus is in a shady area of your garden or indoors then the plant is living in conditions that are contrary to its requirements which causes stress and prevents flowering. If possible cut back any vegetation that is casting shade on your hibiscus or ideally if its potted move it to a sunny patio. Only the tropical varieties can grow indoors hibiscus are not necessarily the best houseplants but ensure that your hibiscus is in the sunniest window of your house to promote blooms.
An accumulation of phosphorous in the soil prevents the hibiscus roots from up-taking other essential nutrients which can stop your hibiscus form flowering an even kill the plant. Avoid any fertilizer that is not well balanced a well balanced fertilizer has an even ratio of Nitrogen, Phosphorous and Potassium NPK and avoid any heavy use of fertilizer, prioritizing improving soil fertility with organic mulches such as well rotted manure.
Hibiscus is unusual in its sensitivity to phosphorous so this can be a frequent cause of the flowers not emerging for gardeners as it is quite a specific problem. Too much phosphorous is one of the causes of hibiscus leaves turning yellow however there are several reasons why hibiscus leaves turn yellow so I wrote another article for the solution. Hibiscus are sensitive to too much phosphorous and even nitrogen when you use fertilizer in too high concentration.
Too much nitrogen causes your hibiscus to grow foliage at the expense of blooms so its important to moderate your applications. Hibiscus are heavy feeders but as stated the best way to feed them is to add mulch to improve the soil compost, leaf mold or well rotted manure an perhaps use a half strength general liquid fertilizer from a brand such as miracle-gro, once a month during the Spring and Summer.
This is often a good balance to provide the hibiscus with the nutrients it requires to display flowers without over indulging the plant and causing it not to flower. If your hibiscus has no flowers but lots of foliage then scale back the use of fertilizer and water it regularly.
It may not display flowers this year but with a more diligent approach to fertilizing the hibiscus should flower the following year. Hibiscus flowers on new years growth so pruning in the growing season can have a serious impact on blooms.
A heavy pruning in the early Spring can either cause the hibiscus to not flower in the Summer or to delay flowering significantly. If flowering is delayed then the flowers are more likely to emerge when the temperature is cooler in the Fall rather then in the height of Summer and often wilt or drop far quicker then they otherwise would.
The same reasons for hibiscus not flowering also apply to potted hibiscus but there are a few conditions that specific to pots that may cause your hibiscus not to flower. If your hibiscus has been growing in the same soil for many years then you should re-pot your hibiscus to promote plant health and flowering.
Re-pot with quality multi purpose compost for good soil structure and moisture retaining capacity. Re-pot the hibiscus in a larger pot so the roots can establish and access the nutrients and moisture they require for flowering without drying too quickly in the intense Summer sun.
Ensure that the pot or container has drainage holes in the base and place a one inch layer of gravel in the bottom of the pot to ensure good drainage. To learn how to save hibiscus, read my article, how to revive dying hibiscus. Hibiscus are native to tropical and sub tropical climates in Asia where they thrive in sunny, humid and warm conditions.
They are in full sun with a southern exposure. The foliage is dark green and very healthy. I fertilize about once a month with azalea fertilizer. The plants produce buds but no blooms. They fall off before opening. Let the plant acclimatize properly before you return it to its life outdoors. For instance, you can place the plant outdoors for a few hours on a daily basis, and then bring it back in.
Do this for a few days until the plant completely acclimatizes and continue to increase the amount of time that the plant is left outdoors with each passing day.
Eventually, the plant will become accustomed to it, and will begin to grow properly. One of the things that you should know is that the hibiscus plant is incredibly thirsty, and if you want it to bloom properly, you need to make sure that it gets an adequate amount of water.
Most people keep the hibiscus plant outdoors, on a porch or their patio, in a container. During the hot summer months, you might have to water your plants on a daily basis as well.
For instance, make sure that you thoroughly saturate the soil so that eventually, water begins to run out of the drainage holes. More importantly, you need to make sure that you empty the drip tray properly after all of the excess water has been drained from the plant. This is important, otherwise the plant will be completely drenched.
This plant does not like to sit for long periods in the water, so you have to empty it now and then. But, how do you prevent the plant from getting overwatered? For that, you need to use the power of touch. Check the top layer of the soil to ensure that it is dry before you decide to water the plant. If the top layer is moist, you might want to hold off on the watering.
Also, make sure that you choose a soil that is easy to drain. If you are going to keep the plant in a container, do make sure that there are sizable drainage holes on the underside to ensure that the excess water is able to leak out. All plants need light to grow properly, and the hibiscus is no exception. This plant loves to revel in full sunlight, and if you want the plant to be covered in flowers, you need to make sure that it gets full sunlight. If the plant gets plenty of sunlight and provided all other conditions are met, your hibiscus will bloom perfectly.
Gradually expose your plant to the outdoors in spring when nighttime temperatures are staying above 55 degrees. Start the plant in shade and increase the time in full sun over a period of seven to 10 days. The plant may lose some leaves as it adjusts to the outside environment. The hibiscus flowers on new wood, so your plant should eventually start to bloom as the new growth matures. Apply a slow-release fertilizer when you move the plant outdoors for the season. Then monitor plant growth and flowering — you may need to add supplemental liquid fertilizer two to three times over the course of the summer.
Stunted growth and off-color leaves are signs that the plant is "hungry. Flat-out beauty of espalier worth the effort. Why do leaves change colors? In winter's cold, potted plants need extra protection.
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