1. 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 heat and detoxification and benefiting the intestines. Therefore, 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

2. Oil wheat vegetable

The best time for the cultivation of oil and wheat vegetables is from March to April every spring, because the temperature conditions at this time can meet its growth requirements. Oil and wheat vegetables can grow when the temperature reaches about 5 ℃. It needs sufficient light. Oil and wheat vegetables like the environmental conditions with high humidity. During the maintenance period, it is necessary to maintain a certain degree of moisture of the soil and give it enough water, so that oil and wheat vegetables can grow better

3. 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