1、 Cause

1. The biggest possibility is that the long-term water supply is inappropriate, and too much water has damaged the root system of the plant, so that the plant cannot grow normally, and the leaves have no nutritional supply, so they will fall off one after another. This is still a better situation. If it is more serious, the whole plant may die

2. It may be because it has been placed in a dark environment for a long time, and the plants like Yang and cannot be protected by light for a long time. Naturally, they will lose their vitality

3. This also happens when you are exposed to strong light in summer

2、 What should I do

1. It is necessary to timely change the pots for the plants, prune the damaged parts, and then match them with fresh and nutritious substrates for their development

2. It needs to be exposed to appropriate light, so that the plant can maintain good growth

3. It needs to provide a suitable temperature, not too low or too high

4. Reduce the application of water and fertilizer for a period of time to allow the plant to heal itself