What is the reason for the curling of flowers?

Flower leaf curling is caused by sun exposure, excessive fertilization, low air humidity or drought, direct blowing of air conditioner, low temperature and so on. Due to sun exposure, it is necessary to move to the shade for breeding and spray more water on the leaves; due to excessive fertilization, it is necessary to wash the soil with water and spray more water on the leaves to alleviate symptoms; due to low air humidity, drought and direct blowing of empty buckets, you can put a humidifier near flowers; because the temperature is too low, you can use bagging to keep warm.