I wasn't too sure when to prune.
Jan 27, If you were to prune them in early spring, you can cut off the dormant flower buds. By pruning after they bloom, you allow them time to set buds for the next year.
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Oakleaf (H. quercifolia) and bigleaf hydrangea (H.

macrophylla), including Nikko Blue and all the other pink- and blue-flowering cultivars, bloom from buds set the previous year. If they need pruning to maintain size or shape, do it Estimated Reading Time: 3 mins. Aug 20, Prune the hydrangea to reduce its size.
If they need pruning to maintain size or shape, do it in the summer, preferably before August.
If your hydrangea has grown quite large, you can prune it in June or July (just after the blooming season) to contain it a bit. Trim back the branches by 1/3 to the nearest joint.
In most cases hydrangeas will grow back quite quickly, so you may not be able to maintain the smaller size for bushgrinding.club: K.