Generally, it is caused by watering, fertilization and sunshine. It can be solved according to different situations.
1. Watering: too much water is applied to make the water in the soil stay wet for a long time, and there is no oxygen in the soil. The root system can't breathe inside, and some small fibrous roots will rot. If the water is not poured for a long time, the supply will fall short of the demand. In the former case, the soil can be loosened immediately to make the water seep out as soon as possible. The latter kind of situation may move to the shade, increases the moisture gradually.
2. Fertilization: the application of fertilizer does not care about the growth of plants, especially the excessive nitrogen fertilizer, which is very easy to cause. If we forget about fertilization or haven't changed the pot soil for a long time, it will lead to the lack of nutrition inside, which will cause the branches and leaves to become thin. In the former case, stop immediately and increase the water volume. In the latter case, new basin soil can be replaced, and thin fertilizer can be applied after adaptation.
3. Sunlight: too strong sunlight can scorch leaves and cause them to turn yellow. If the light is insufficient, the leaves will become thin and yellow. These two kinds of situations can change the position, put in the place with astigmatism to maintain
In order to be beautiful, the fallen leaves can be removed, and then see if they are suffering from diseases and insect pests, and spray them in time.
