There are records of rhododendrons in ancient books in China. As early as 492, in Tao Hongjing's Notes on Materia Medica in the Northern and Southern Dynasties, it was recorded that "the sheep died after eating its leaves", which was 1500 years ago, more than 1200 years earlier than Europeans; By the Tang Dynasty, some people had planted azaleas at home. Bai Juyi had a sentence in the poem "Mountain Pomegranate Flower", "This is a mountain _ thing, today _ building incense"; In the Northern Song Dynasty, the king said, "Nature is small, the forest is small, and this flower is big." This shows that transplanting azaleas from Shan Ye to the courtyard was successful in the Tang and Song Dynasties.
In Compendium of Materia Medica in Ming Dynasty, Li Shizhen distinguished the poisonous rhododendron. Tang started with the nontoxic RhododendronsimsiiPl, and mentioned that there were _ _ species, purple species, 5,000 _ _ species of rhododendron, showing the progress made in cultivation and breeding at that time. In1586-1641year, Hong Xu, the secretary of Xu Xiake's travel notes, planted many kinds, such as rhododendron and Ma Yinghua. "The flowers and trees in central Yunnan are very strange, but camellias are the most.