Answer: The bigleafed hydrangeas bloom on wood formed the previous year. The two most common reasons for lack of bloom are winter damage and incorrect pruning. Both of these would damage or remove the blooming wood. These plants grow best in a sheltered location, particularly protected from winter winds. Any pruning would be done carefully in spring to possibly thin out just a few of the older branches or if an all over tip pruning is done, in summer, immediately after they bloom. I hope this helps.
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