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Hydrangeas bloom on either old or new growth. Those that bloom on old growth can be pruned shortly after they are finished flowering. Those that bloom on new growth can be pruned in late winter. It is always beneficial to deadhead hydrangeas (remove dead flowers as they occur).
Hydrangea arborescens. The most common variety of this species is Annabelle. Bloom on new growth, prune in late winter.
Hydrangea macrophylla. French or broadleaf hydrangeas, including common varieties like Nikko Blue. Bloom on old growth, prune shortly after they are finished flowering.
*Repeat-blooming varieties of H. macrophylla, such as Penny Mac & Endless Summer bloom on both old & new growth, and so can be pruned after flowering is finished or in late winter.
Hydrangea paniculata. Late-summer blooming types, including Limelight, Pinky Winky, Little Lamb, PeeGee and Tardiva. Bloom on new growth, prune in late winter.
Hydrangea quercifolia. Oakleaf hydrangeas bloom on old growth, prune shortly after they are finished flowering.
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