" In Japan they call it Ajisai which means "water drinker", because it is a plant that needs a lot of water. "
Hydrangeas have been cultivated since ancient times as an ornamental plant in Japan, and since the mid-19th century also extensively in other areas of the world with temperate climates. It is a very popular ornamental plant for its huge flower heads.

Its flowers can be pink, white, or blue, depending in part on the pH of the soil. In relatively acidic soils, with a pH between 4.5 and 5, the flowers turn blue; in more alkaline soils, with a pH between 6 and 6.5, the flowers turn pink; and in alkaline soils with a pH around 8, the flowers grow white.
When do hydrangeas bloom?
Hydrangeas produce inflorescences from early spring to late fall, they are found grouped in bouquets in the end of the stems.