Celery is a cold-tolerant vegetable, which needs cold and humid environmental conditions and does not grow well under high temperature and drought conditions. Celery needs different temperature conditions at different growth and development stages? .

Celery belongs to Umbelliferae, which has a long planting history and a large planting area in China. It is one of the vegetables that people in China often eat. It is rich in protein, carbohydrates, carotene, B vitamins, calcium, phosphorus, iron, sodium and so on. At the same time, it has the functions of calming liver and clearing away heat, expelling wind and promoting diuresis, relieving restlessness and swelling, cooling blood and stopping bleeding, detoxifying and dispersing lung, invigorating stomach and promoting blood circulation, and clearing heat.

Celery roots are shallow, generally distributed in 7 ~ 36 cm soil layer, but most root groups are distributed in 7 ~ 10 cm tillage layer. Celery is not drought-tolerant because of its shallow root distribution. The main root system of direct seeding celery is developed, and the transplanted celery has developed lateral roots because the main root is cut off, which is suitable for seedling transplanting or soilless culture.

The growing season of celery is summer, which is a hot and rainy season. Such climatic conditions are not conducive to the growth and development of celery seedlings. In order to improve the survival rate of pollution-free celery, it is required to take active shading measures during sowing and seedling emergence to prevent direct sunlight from damaging seedlings and avoid rain erosion.