Will Guanyin vegetable freeze to death in winter?

Take the temperature in Shanghai as an example: in recent years, the first fog began to appear in the middle and late period of Shanghai 1 1, and then the weather gradually became cold with the delay of time. Therefore, in order to ensure that Guanyin vegetable is not damaged by freezing in winter and overwinters safely, besides protective cultivation, it is necessary to do a good job of anti-freezing and keeping warm at night, cover it with harmless cloth to prevent freezing injury, and cover it with film when the temperature reaches below -3 degrees at night.