The cold resistance of celery is strong, especially the seedling stage can tolerate the short-term low temperature of -10°C. Using this feature, the seedling stage will pass through the winter in the shed, and after the spring, it will turn into normal growth with the increase of temperature.

Seedling management: After the celery emerges in the low temperature season, and seedlings have poor drought resistance, they should add water in time and dig shallowly to keep the soil moist. When the seedlings grow to 2 or 3 true leaves, they are planted and the field weeds are removed. When 4 to 5 leaves, the root system is more developed, and the absorption ability is enhanced. The water can be properly controlled to keep the surface wet.

Fertilizer management: celery enters the growing season, growth is accelerated, and more fertilizer and water are needed. In this period, we must keep the soil moist and provide celery with sufficient water and nutrients. In this stage, watering is performed by means of irrigation, and nitrogen fertilizer is applied in combination with watering. When topdressing urea, urea can be added to a bucket of water to dissolve it, and it can be applied to the field with water irrigation. The combination of watering and fertilization can make the fertilization uniform and facilitate the rapid development of fertilizer efficiency. Real-time root application and micro-fertilizer combined with root can induce plants to absorb nitrogen, phosphorus, potassium and various trace elements in soil, and improve the quality of celery.

Cold Insulation: The weather in the north is cold, and there are cold and cold air attacks from time to time. Occasionally, significant cooling will occur. Because celery suitable growth temperature is 15 °C ~ 20 °C, the temperature is below 15 °C long-term celery growth is poor, the use of greenhouse cultivation celery the main insulation measures is to cover straw. If there is no cold weather on sunny days, we can retract the straw curtains at eight or nine o'clock in the morning. This will not only help increase the room temperature, but also increase the light and promote the growth of celery. And spray a new high-fat film, water evaporation points, anti-bacterial infections, freeze-thaw insulation.

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