Heavenly Hydrangea
/To determine when to prune, you will need to determine what type of hydrangea you have. Hydrangea either blooms on "old" wood or "new" wood. Ask neighbors or a nearby nursery to help you with identification. Hydrangea that blooms on old wood (Macrophylla (“moptops”), oakleaf, and lace caps) should be pruned only after they bloom in the summer, before August to be safe, because next year's buds form on this year's growth.
Hydrangea that blooms on new growth (Annabelle, Limelight, Pee Gee, and other H.paniculata varieties) can be pruned to within 6-12 inches from the ground in the early spring. No matter which type you have, you can begin to reinvigorate plants by cutting 1/3 of the branches to the ground in the summer.
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