Willow is a native tree species in China. According to research, the genus Salix existed in the mountain forests of the Miocene of the Tertiary Period. Pollen analysis in the Qingdao area of ??Shandong Province revealed that "Salix plants existed near Jiaozhou Bay in Qingdao between 11,000 and 8,500 years ago." ”Willow is also one of the plants with the earliest recorded artificial cultivation and the widest distribution in my country. The word "willow" has appeared in prehistoric oracle bones. Willow planting in China has a history of more than 4,000 years, which can be traced back to the ancient Shu King Yufu who sealed trees to define boundaries.
