If you don't pay attention to the light, it will cause peony to lose its leaves. After the potted peony flowers are transferred to normal management, they can be placed in sunny places to ensure sufficient sunshine. Peony is a long-day plant that likes light and has a little tolerance to semi-shade. The duration of natural light during flowering is about 10- 12 hours. Therefore, if the greenhouse urges flowers, the light duration should be extended as much as possible, reaching 10 hour or more. Especially in the early and middle stages, if the light is less than 8 hours for a long time, the buds will stop developing and gradually shrink, and even the leaves will stop growing, especially Hu Hong. Insufficient illumination time is an important reason for the failure of peony flower promotion.