Bougainvillea yellowing leaves and not blooming? Handle it this way, and flower buds will keep sprouting
The picture below is a flower enthusiast's bougainvillea. The question is, what causes bougainvillea to often have yellow leaves? What should be done? Bougainvillea is very easy to grow, and yellow leaves generally do not appear. If yellow leaves do appear, it is usually due to a lack of ferrous sulfate, and another cause is a problem with the root system.
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A lack of ferrous sulfate is easy to solve. It is that it likes slightly acidic soil. If the soil is too alkaline, it will cause the leaf veins to be green while the other parts are yellow. This is very easy to identify, especially when it appears on new leaves. If you notice it, just supplement ferrous sulfate in time.
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Looking at your picture, the root system clearly has a problem, and this is divided into two situations. Yellow leaves caused by root rot from overwatering. Yellow leaves from too much or too little fertilizer. The root system of bougainvillea is very developed, and its demand for water is not very great. Our watering principle is not "water when the surface is dry and dry out between waterings"; it is to water thoroughly only after it has dried out completely. Because if we want it to bloom more, we can all solve this through water control. Water control means letting it wilt completely, then watering again. This can promote blooming. If the potting soil is still very wet and you water it thoroughly directly, its root system is prone to rot of the fine feeder roots. With slight fine feeder root rot, its root absorption function will weaken, which will cause the leaves to turn yellow. This matches your picture quite well.
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Root system problems also include root burn caused by excessive fertilization. You have used homemade fruit fertilizer water for a long time. If it is not well fermented, it will cause root burn. As much as possible, choose well-fermented organic fertilizer or special fertilizer; both are fine. Do not make the fertilizer concentration too high. Using it two to three times a month is enough. In this way, yellow leaves are less likely to appear.
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Your picture shows a root system problem. Change the watering method: let the potting soil dry out completely, and water again only when the leaves show slight wilting. Do not fertilize too frequently, and as much as possible choose well-fermented fertilizer. It will recover in less than a month.
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