1、 Cause

1. Low temperature: the leaves roll down. The main reason is that the temperature is too low. It can't stand the cold. Once the temperature drops, it will lead to plant frostbite. It will protect itself and cause the leaves to roll down

2. Lack of sunshine: Catharanthus roseus has a great demand for light and needs to maintain sufficient sunshine for growth. If there is no sunlight, its growth will be affected, weak growth and poor growth, resulting in curly leaves

3. Maladjustment: if it is just on the basin or just moved to a new environment, it is not suitable for the surrounding area, and it may curl in a short time

2、 Solution

1. Raise the temperature: move the plants indoors in time in winter. Pay attention to keep warm. Adjust the temperature to above 10 ℃. If you want to grow well, you'd better keep it above 15 ℃

2. Give light: if there is a lack of sunlight, you can move to the place where the light can shine and contact the sunlight to promote photosynthesis

3. Waiting for adaptation: this situation does not need too much interference, just put it there for careful maintenance and wait for its own adaptation and recovery