1. Leek

Leek is a perennial herb of Liliaceae. It has strong cold resistance and heat resistance. It is cultivated all over China. It likes a cold and cool environment. The suitable temperature for seed germination is above 12 ℃, and the suitable temperature for the growth of leek is generally between 15 ~ 25 ℃. It likes medium intensity light, but it also has strong shade tolerance. However, if the light is too weak, it will affect the progress of photosynthesis, resulting in poor quality and even yield

2. Rape

Rape, also known as oil cabbage, is a plant of Brassica in Cruciferae. Rape is widely planted in Anhui, Henan and other places in China. Its nutrition is very rich. Vegetables contain high vitamin C, and rapeseed can squeeze oil. Rape is generally suitable for growing in relatively humid places. The minimum temperature of seed germination is between 4 ~ 6 ℃, and the suitable temperature for its growth is 20 ~ 25 ℃. However, when cultivating rape, it can be given an appropriate temperature difference between day and night, which is conducive to the accumulation of dry matter and oil

3. Chinese Cabbage

Chinese cabbage is an herb of Brassica in Cruciferae. It is very nutritious, rich in carotene, vitamins B1 and B2 and mineral elements. In addition, protein vegetables have high medicinal value and have a good effect on clearing away heat, detoxifying and benefiting the intestines. Therefore, Chinese cabbage is one of the common vegetables on the dinner table in the north. Chinese cabbage is relatively resistant to low temperature. It can still grow in the environment of 0 ~ 2 ℃. The suitable temperature for Chinese cabbage seed germination is 20 ~ 25 ℃. It is suitable to grow in the environment with sufficient sunlight and large temperature difference between day and night