When and How to Prune Hydrangeas for Stunning Blooms

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Pruning hydrangeas can feel tricky, but it’s a vital step in maintaining healthy plants and stunning blooms. The key lies in identifying your hydrangea type—whether it blooms on old wood or new wood. Here’s an easy-to-follow guide for pruning hydrangeas correctly.

Hydrangeas That Bloom on Old Wood

  • Varieties: Bigleaf (H. macrophylla), Oakleaf (H. quercifolia).
  • When to Prune: Just after blooms fade in June or July. Avoid late pruning, as buds for next year form in late summer.
  • How to Prune:
    1. Deadhead blooms at a 45-degree angle just below the flower.
    2. Remove dead canes and crossed branches.
    3. Every few years, prune the oldest canes to the ground to promote new growth.

Hydrangeas That Bloom on New Wood

  • Varieties: Panicle (H. paniculata), Smooth (H. arborescens).
  • When to Prune: Late winter or early spring before growth begins.
  • How to Prune:
    • Trim stems back by 1/3 to encourage bigger blooms.
    • Remove dead or tangled branches for airflow.

Climbing Hydrangeas

  • Variety: H. petiolaris.
  • When to Prune: Late summer, after blooming.
  • How to Prune: Cut dead flower heads and trim unruly vines to maintain shape.

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