Leek is a cool climate, which is relatively resistant to low temperature. The optimum temperature for its growth is 12-23℃, so the temperature can be well controlled in the greenhouse, and carbon dioxide can be artificially supplemented in the greenhouse to improve the photosynthesis of Chinese chives in the greenhouse. In addition, the advantage of leek in greenhouse is that it can be harvested continuously in winter. After all, leeks grow faster because of the high temperature in greenhouses.