Hydrangea is a woody plant belonging to the Hydrangea genus in the Hydrangeaceae family. The tree crown is spherical; Small branches thick, hairless; Leaves are oblong or broadly elliptical in shape, with thick and hairless petioles; The inflorescence is spherical or head shaped, with thick branches and attached soft hairs. The flowers are dense and pink, light blue, or white in color; The fruit is in the shape of a spinning top. The flowering period is from June to August. The original name of the hydrangea was "Eight Immortal Flowers". People saw that this flower looked like a hydrangea, so it was also called "hydrangea flower". Hydrangea originated in China and is now distributed in Fujian, Jiangxi, Guangdong, Hong Kong, and Yunnan Guizhou provinces. It is also found in Japan and Korea. It often grows in valleys below 1700 meters above sea level, in dense forests by streams, or under sparse forests on mountaintops, and is often cultivated near houses, temples, or courtyards.