How to Grow Hydrangea
Shrub
Hydrangeas are deciduous flowering shrubs prized for their large, long-lasting flower clusters and dependable summer color. US home gardeners grow them for foundation plantings, shrub borders, and cut arrangements, and many kinds thrive in the partial shade where other flowering shrubs struggle. Common garden types include bigleaf, panicle, smooth, and oakleaf hydrangeas, each suited to different climates and light levels.
Planting
Plant hydrangeas in spring or early fall so roots can settle before extreme heat or hard freezes. Choose a site with morning sun and afternoon shade for bigleaf and oakleaf types, while panicle hydrangeas tolerate more full sun; all prefer rich, moist, well-drained soil high in organic matter. Dig the hole as deep as the root ball and about two to three times as wide, set the plant at the same depth it grew in the pot, and water it in well. Space most shrubs about 3 to 6 feet apart depending on the mature size of the variety, and check the plant tag for cold hardiness in your region.
Care
Keep the soil consistently moist but not waterlogged, watering deeply about once or twice a week and more often during heat, since hydrangeas wilt quickly when dry. Spread a 2 to 3 inch layer of mulch over the root zone to conserve moisture and moderate soil temperature, keeping it a few inches back from the stems. Feed lightly in early spring using a balanced garden feed worked into the soil surface, and avoid feeding late in the season. Prune according to type: bigleaf and oakleaf hydrangeas that bloom on old wood are pruned right after flowering, while panicle and smooth hydrangeas that bloom on new wood are cut back in late winter or early spring, and removing spent blooms tidies the plant and can encourage reblooming in some varieties.
Bloom time
Most hydrangeas bloom from early or midsummer into fall, and individual flower clusters can hold their color for several weeks. Panicle and reblooming types often extend the show the longest, sometimes into early autumn.
Garden uses
Hydrangeas work well as specimen shrubs, in mixed borders, along foundations, and in large containers, and compact varieties suit small yards. The big flower heads are popular for fresh and dried arrangements and add long-season structure to the landscape.
Tips
Flower color on bigleaf hydrangeas responds to soil chemistry, with acidic soil tending toward blue and alkaline soil toward pink, so a soil test helps you plan the shade you want. Plant where the shrub is sheltered from strong afternoon sun and drying wind to reduce wilting and leaf scorch. In colder regions, protect flower buds of old-wood types over winter with a loose mulch or a temporary wrap, and delay any hard pruning until you can see which stems have leafed out.
General guidance for US gardens. Timing and hardiness vary by region; check your local frost dates and hardiness zone. Page updated Aug 4, 2026.