1. Its maintenance cannot grow in a closed and dark environment for a long time, otherwise it will cause excessive growth. But it can't be exposed to too strong light for a long time, which will also cause its leaves to be gray. Although it doesn't need much fertilizer, it can't be applied at all, otherwise its leaves will turn white and ugly because of malnutrition. 3. Too low or too high temperature will cause this phenomenon, especially in winter and summer. It is sensitive to smoke and ash. If the leaves are stained with a lot of dust, they will turn white and grow unhealthy.

Second, what should I do?

1. It is best to keep the ambient temperature above zero 10 degrees in winter. In summer, the growth temperature should be controlled at about 25~28℃, so that the growth can be slowly restored after curing for a period of time. 2. Apply fertilizer correctly, and don't apply undecomposed or too thick fertilizer. The application frequency is about 10 ~ 15 days, and no fertilization is needed in cold weather. After a period of time, you need to wipe the leaves of plants with a clean wet rag, and it is advisable to clean the dust on them.