Hydrangea (scientific name: Hydrangeamacrophylla (Thunb.) Ser.): A genus of plants in the family Hydrangeae in the family Tiger's ear. Shrub, 1-4 m tall;

Hydrangea macrophylla (Thunb.) Ser. ): A genus of plants in the family Hydrangeae in the family Hydrangeae. Shrub, 1-4 m tall; The stem often emits most of the radiating branches at the base to form a circular shrub; The branches are cylindrical. Leaves are papery or nearly leathery, inverted ovate or broad-oval. Umbelliferous polyumpses are nearly spherical, 8–20 cm in diameter, with a short total peduncle, dense flowers, pink, light blue or white; The petals are oblong, 3–3.5 mm long. The capsule is immature and gyring-shaped; The seeds are not ripe. Flowering period is from June to August.

The hydrangea flower type is plump, large and beautiful, and its flower color can be red and blue, which is pleasing to the eye, and it is a common potted ornamental tree. Hydrangeas were cultivated earlier in China, and hydrangeas were planted in Jiangnan gardens built in the Ming and Qing dynasties. The park built in the early 20th century is also inseparable from the cultivation of hydrangeas. Modern parks and scenic areas are planted in pieces to form landscapes.