Hydrangea is a water-loving shrub known for its lush greenery and large, dramatic blooms, some of which change color as the season progresses. The plant is original to Asia but is now widely grown as a landscaping specimen in temperate climates elsewhere. Because the outer layer of its stems tend to peel, revealing different shades of pith beneath, hydrangea has earned the nickname of Seven Barks. A tea is made from the root of the plant, which contains a crystalline substance in the coumarin family called hydrangine, also known as umbelliferone.