Oak Leaf Hydrangeas Pruning. When to prune oakleaf hydrangea. Pruning however can be very important to the overall look of the plant.
Pruning to ground level should be done in the spring or fall. Prune bigleaf vining and oakleaf hydrangeas after blooming in fall or winter. When you prepare to prune your Oakleaf hydrangea you want to remove older growth.
Pruning oakleaf hydrangeas can also help establish a full shrub.
This gives them time to grow new buds that. You should take approximately one-third of the total growth or less but never more. Oakleaf hydrangeas bloom on the previous seasons growth so prune right after flowering in the fall or in early winter. Only prune in early spring before the plant leafs out.