Hydrangeas are a genus of over 75 species and 600 named cultivars that are native to a wide range of regions and countries, including Japan, Asia, Indonesia, Himalayan mountains, and the Americas. The beautiful flowers produced by this plant is what makes these so popular. Most put on a showy display from early spring all the way into fall. The large flowers come in a variety of shapes, colors, and sizes. Hydrangea blooms can be pink, blue, red, white, purple and green!