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- Fairfield, CT
When should you prune a hydrangea or just let it grow. We prune ours and it doesn’t bloom
- Oakland, OR
Pruning a hydrangea at the wrong time will certainly cause it not to bloom. The best time to prune a hydrangea all depends on whether the hydrangea produces blooms on new growth, flowers on the previous year's growth, or blooms on both new and old wood.
Those that bloom on old wood (the previous season's growth) include most garden or bigleaf hydrangeas (Hydrangea macrophylla), oakleaf hydrangea (H. quercifolia), and hydrangea serrata. The best time to prune for this group is after they have bloomed.
Hydrangeas that bloom on new wood include smooth hydrangea (H. arborescens), hydrangea paniculata, and some of the garden or bigleaf hydrangeas. The best time to prune for this group is late in the dormant season, pruning only to control the plant's shape.
Pruning tips for those that bloom on both new and old wood include pruning dead wood out when new growth starts in spring, and waiting until after bloom to prune for shape. Good luck!