Hydrangea is a woody plant of the Hydrangea genus in the Hydrangeaceae family. The tree crown is spherical; Small branches thick and 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". Hydrangeas are native to China and are distributed in Fujian, Jiangxi, Guangdong, Hong Kong, and Yunnan Guizhou provinces. They are also found in Japan and North Korea. It prefers fertility and good drainage. The pH of the soil has a great impact on flower color, with blue flowers blooming on acidic soil and red flowers blooming on alkaline soil.