Hydrangea · last checked 2026-09-28
When to prune hydrangeas: bigleaf, Annabelle and panicle
The right time to cut a hydrangea depends on which kind it is. Bigleaf (mophead and lacecap) and oakleaf types set next year’s buds on old wood; Annabelle and panicle types flower on new growth.
Cutting an old-wood type at the wrong time is a common reason for a year with no flowers.
Each line names the Extension service it comes from and links to their page. Where the services split plants into groups, each group is shown as they put it.
Sun and soil
- Clemson Cooperative Extension says in South Carolina, bigleaf hydrangea does best with morning sun and shade in the afternoon. Hydrangea Care in South Carolina (HGIC fact sheet) · checked 2026-09-28
- Clemson Cooperative Extension says oakleaf hydrangea, a Southeastern native, copes with more sun and needs less water than bigleaf types. Pruning Hydrangeas (HGIC fact sheet) · checked 2026-09-27
Watering
- Clemson Cooperative Extension says water deeply once a week, and more often when it is dry. In South Carolina summers, hydrangeas in sandy soil often need a deep soak twice a week. Hydrangea Care in South Carolina (HGIC fact sheet) · checked 2026-09-28
When it blooms
- Clemson Cooperative Extension says smooth hydrangea blooms from late June through September; panicle (peegee) hydrangea blooms white in late summer. Hydrangea Care in South Carolina (HGIC fact sheet) · checked 2026-09-28
- Clemson Cooperative Extension says among panicle hydrangea cultivars, 'Praecox' blooms early, in June, and 'Tardiva' blooms late, in August and September. Hydrangea Care in South Carolina (HGIC fact sheet) · checked 2026-09-28
When to prune
- University of Wisconsin–Madison Extension says counts hydrangeas among summer-flowering shrubs, pruned while dormant or in early spring before buds break; Annabelle can be cut back to 4 to 10 inches. Pruning Deciduous Shrubs (Wisconsin Horticulture) · checked 2026-09-27
- Clemson Cooperative Extension says bigleaf hydrangeas do not need pruning, but dead canes and rejuvenation cuts are best done right after flowering; ideally stop by August 1 so next year’s buds are kept. Pruning Hydrangeas (HGIC fact sheet) · checked 2026-09-27
- Clemson Cooperative Extension says if you have to prune in winter or spring once buds have formed, remove no more than a third of the canes; oakleaf hydrangeas are also pruned soon after blooming. Pruning Hydrangeas (HGIC fact sheet) · checked 2026-09-27
- Clemson Cooperative Extension says reblooming cultivars such as Endless Summer flower on old and new growth, so timing matters less. Pruning Hydrangeas (HGIC fact sheet) · checked 2026-09-27
- Clemson Cooperative Extension says lists bigleaf and oakleaf hydrangea among shrubs to prune after flowering, because they bloom on the previous season’s growth. Pruning Shrubs (HGIC fact sheet) · checked 2026-09-27
- Colorado State University Extension says Annabelle and Peegee (panicle) hydrangeas bloom on new wood and can be thinned or renewed in early spring before growth starts; hydrangea tolerates being cut to the ground then. Pruning Flowering Shrubs · checked 2026-09-27
Timing shifts with your local climate and the plant’s variety; your state’s Extension service has the final word. See how these pages are put together.
Other flowers: Daffodil, Lavender, Mums (garden chrysanthemums), Peony, Rose, Tulip.