Perennials are notoriously more expensive than annuals, and you will pay a pretty penny for hydrangea shrubs, so knowing all you can before purchase is essential.
The hydrangea is hardy and easy to grow without needing much special attention. They generally don't need pruning or special fertilizer and will bloom year after year without your help. They grow into good size shrubs that can be used as singular points of interest in the garden or grouped to form a beautiful hedge. No wonder this flowering shrub is a favorite among gardeners.
Hydrangeas grow in many parts of the world, but the ones I am most familiar with grow in my area of the northeastern United States. Before you buy online, consult a Zone Map to help you choose which ones will thrive in your area.