Causes and Solutions for Yellowing and Dropping Leaves on Potted Bougainvillea

Bougainvillea is a flowering plant with a unique flower shape, a wide range of flower colors, and a long blooming period. It is especially suitable as a spring-welcoming flower, and is commonly grown in homes or courtyards, where it looks very festive. Bougainvillea is a plant that loves warmth and light, so when caring for it you must understand its growth habits. Recently someone asked, what should be done when bougainvillea shows yellowing and dropping leaves? Why does it fail to bloom? Let's take a look together below.

1. What to do when bougainvillea leaves turn yellow and drop?

1. Improper watering causes bougainvillea leaves to turn yellow and drop

Beginners easily run into problems with watering, either watering too much and too often, or watering too little. Both mistakes can cause bougainvillea leaves to turn yellow and drop. Too much water causes waterlogging and root rot, so the roots cannot breathe and the plant cannot absorb nutrients and water, resulting in yellowing leaves. Long-term water shortage causes insufficient water uptake by the leaves, and the leaves turn yellow and drop.

Solution: Watering should be decided according to the plant's growth condition, growing season, and soil moisture. In summer, the amount of watering can be appropriately increased, while in winter it should be reduced. In spring and autumn, decide the amount of watering according to its growth stage; basically once a day, not too much, and do not go without watering for a long time.

2. Poor soil looseness causes bougainvillea leaves to turn yellow and drop

When growing bougainvillea, it is easy to neglect the potting soil problem. If the soil is not loose enough and does not drain well, the roots cannot get air and cannot breathe, and the leaves will turn yellow and drop, with severe cases causing the whole plant to die.

Solution: Bougainvillea needs loose, airy, well-draining soil with sufficient base fertilizer for its growth, so when mixing potting soil, prepare it according to these points to ensure its nutritional needs.

3. Improper light causes bougainvillea leaves to turn yellow and drop

Bougainvillea is a flowering plant that loves light. Being in a dark environment for a long time or being exposed to the scorching sun in summer can both cause the leaves to turn yellow and drop.

Solution: Because bougainvillea is attractive, many people choose to grow it indoors, not realizing that it grows better with sufficient light, so it should get 8-10 hours of light every day. However, the summer sun is rather strong, so it cannot be exposed to the sun all the time; at noon it should be properly shaded to prevent the leaves from being scorched. In winter, when sunlight is insufficient, it should be moved to a warm indoor place, and if conditions allow, light can be provided, such as with a flashlight or lamps.

4. Improper fertilizing causes bougainvillea leaves to turn yellow and drop

When too much fertilizer is applied, it is too concentrated, or there is a long-term lack of fertilizer, bougainvillea leaves will turn yellow and drop. The main difference is that with a lack of fertilizer, the new leaves are very pale and yellow, while with excessive fertilizing, the old leaves begin to turn yellow from the edges toward the middle.

Solution: During the vigorous growth period of bougainvillea (summer), sufficient fertilizer should be given. In addition to the original base fertilizer, we should also apply a top dressing once a week, and it should not be too much or too concentrated at one time. In autumn, gradually reduce the amount of fertilizer, and by winter no fertilizer can be given at all, so as to avoid excess nutrients causing the whole plant to die.

2. Reasons why bougainvillea does not bloom

1. Not pruning in time

If you want bougainvillea to bloom well, pruning is a step that must be done. Besides keeping the overall shape attractive, pruning is also one of the ways to promote flowering. This is because many spent flowers and weak branches and leaves also compete for nutrients with the healthy plant and flower buds, so these excess parts or overly dense parts should be properly pruned, leaving just a few growth nodes.

2. Not giving enough light before the flowering period

For bougainvillea to meet the conditions for blooming, it must have sufficient light. Many people overlook this point and generally just leave it indoors without further care, which makes it very hard for it to bloom. So one month or half a month before the flowering period, it is necessary to ensure about 4 hours of light, and gradually you will find that the bougainvillea you grow not only blooms on time, but the flower color is also very pure.

3. Not using the right fertilizer

As a fertilizer-loving plant, bougainvillea can also develop only leaves and no flowers if fertilizer is used improperly, especially when overly concentrated nitrogen-phosphorus-potassium fertilizer is used for a long time. Also, fertilizing too frequently causes a large number of flower buds to drop; generally, fertilizing once a month is about right. If you want it to bloom fully and with vivid colors, you can use a little specialized nutrient solution each month; everyone can ask at a flower shop.

In summary, as an ornamental flower, bougainvillea loves light and tolerates cold, but special attention must be paid when watering and fertilizing, otherwise problems such as yellowing leaves, dropping, and failure to bloom are very likely to occur.