Hydrangeas have been popular garden plants for decades. Older varieties add sentimental charm, while newer ones now offer an even wider variety of shapes, colors, and sizes. Hydrangeas put on a showy display from early spring all the way into fall and thrive in both sandy coastal soils and in shady woodland sites and almost everything in-between. Hydrangea blooms can be white, pink, or blue depending on the soil's pH.