Slow seedling stage: during this period, put the plant in a cool environment, reduce watering, fertilization, etc. after it adapts to the environment, normal maintenance will be good. Improper ventilation: the environment is sultry and poorly ventilated, which will lead to slow growth. Good ventilation environment shall be ensured. Lack of light: receive at least 6 hours of sunshine every day, and pay attention to shade in summer.