Hydrangeas bloom during the summer and fall seasons. The plants grow in the specific USDA hardiness zones of 3 through 9 in the United States.
Hydrangeas are considered a shrub. The plants prefer an environment of shade or partial sun and grow in any type of soil that has a pH balance ranging from acidic to neutral to slightly alkaline. The soil type and the pH value determine the color of the flowers. These visually appealing flower clusters can be blue, pink, white, red and purple, depending on the plant variety and the soil pH. They can be grown in gardens, along borders or in containers.