There are more than 40 species of jujube plants, mostly distributed in subtropical and tropical areas. There are more than ten species in my country, among which there are three main cultivated species. ①Common dates. It is native to my country and is distributed in the north and south. It has strong adaptability and stress resistance. It is a deciduous tree, and all jujubes cultivated in my country belong to this species. There are three varieties of this species: one is the thornless jujube; the other is the calabash jujube; the third is the dragon beard jujube. ② Sour dates. It is widely distributed in northern my country, and is also found in central and eastern China as shrubs or trees. ③ Maoyezizao. Also called Yunnan jujube and southern jujube. Distributed in Taiwan, Yunnan, Hainan and other places, it is a small deciduous tree.