Liaoning coriander land needs assistance to survive winter and spring. According to relevant public information on the Internet, coriander is not easily frozen to death in winter. When the temperature is low, the leaves of coriander may wither. When winter comes and the outside temperature is lower than 2 degrees Celsius, coriander may be frozen to death. In winter, cilantro needs auxiliary maintenance. It is necessary to reduce the frequency of watering. Watering can be done according to the dryness and humidity of the soil. The plants should also be covered with plastic film to moisturize and keep them warm, so as to help them survive in spring.