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Select good varieties, use strong cold resistance, low light resistance, high yield resistant varieties. Such as the United States celery, Tianjin Huang Miao, Hengtai young seedlings stem, glass and other crisp. Shade cooling, nurturing strong seedlings. Before sowing, the seedlings were soaked in water and moisturized and cooled. After sowing, they were covered with 1.5 cm thick fine soil and covered with straw mats, grasshoppers and other materials. When one-half of the seedlings tops the soil, remove the cover in the morning or evening. 2 - 2 leaves before pouring water to keep the sputum moist, 2 - 3 leaves can be seen dry see wet. After the true leaves are unfolded, the seedlings reach a distance of 3 cm square. From the end of August to the beginning of September, nearly 7-8 leaves of seedlings can be planted. Closely planted. Plants were planted at a spacing of 1510-12 cm in order of planting, multiple plants with single acupoints for harvesting medium and small plants, and single plants with Yidan aquilegia for harvesting of axillary leaves. Apply enough base fertilizer, apply top dressing timely and water it properly. Before 1/15 hectares of planting, 500 to 750 kilograms of high-quality soil miscellaneous fertilizers, 50 kilograms of superphosphate and 10 kilograms of potassium sulfate were applied. During the growth period, 50 kg of urea was used as top dressing. After the seedlings were transplanted, they were applied four times in mid-October, mid-November, mid-December, and mid-January. Ten--15 days after planting is a mild seedling stage. It is necessary to diligently pour small water to keep the soil moist. After easing the seedlings, the seedlings are planted and shallow ploughing is carried out to promote the growth of the root system and the heart. When most of the leaves are unfolded, water is poured every 3 to 4 days. After the "frost down" shed, the temperature is lowered and the growth is slow. Minimize the number of watering and keep the ground dry. Cold storage insulation and ventilation management of the buckle shed Before and after the “frost fallâ€, when the outside temperature drops below 10°C, the shed should be insulated in time. After the shed, the ventilation should be strengthened in the early stage so that the temperature can be controlled between 15°C and -25°C. As the weather turns cold, gradually reduce the amount of ventilation until the ventilation stops. After the beginning of winter, the temperature dropped rapidly and it was necessary to cover grass and cold weather. After entering January, when the outside temperature is lower than -5°C, the temperature in the shed is kept between 5°C and -9°C, and the ground temperature is not lower than 5°C. When the weather turns warm after the Spring Festival, ventilation should be taken care of. Harvested leaves. When harvesting, it is recommended to prevent the large leaves from being wiped out at one time, and the two upper leaves should be selected to ensure that the plants can grow rapidly after harvesting.