The protective layer of century-old Zhemu. Zhemu refers to Zhemu. Zhezhe is a plant belonging to Moraceae and Zhezhe genus, which has been growing for a hundred years. The aging substance is the natural weathering and oxidation of wooden stakes, which leads to the gradual debonding of bark into relics, thus forming a "cement skin"-like protective layer. . The stem bark fiber of Zhezhe can be used to make paper; Root bark is medicinal; Young leaves can raise young silkworms; Fruit can be eaten raw or brewed; The wood heart is yellow, hard and meticulous, and can be used for writing or yellow dyeing; It is also a good hedge tree species.