Birch is the common name for plants of the genus Betula. There are about 100 species in the world, mainly distributed in the northern temperate zone, and a few species are distributed in the cold zone. There are 29 species produced in China. Among them, white birch is the most widely distributed, from Northeast and North China to Northwest and Southwest. In addition, there are red birch, Shuo birch, black birch, etc. Birch trees are usually shrubs or small and medium-sized trees. The wood is relatively hard, has poor corrosion resistance, and is easily deformed by moisture. It can be used as wood for plywood, joinery, etc. The bark can be pyrolyzed to extract tar, and the tree sap can be used to make drinks and other products. Handicrafts; garden greening tree species. 
