Answer: If it is one of the Hydrangea macrophylla types, it may be suffering cold damage each winter and/or spring which prevents it from flowering or you may be pruning it at the wrong time. These typically flower on old wood meaning stems that grew the year before. If winter kills back the stems or the stems are pruned off before the bloom period, or if frost nips the new growth in the spring, then it will not bloom much if at all. In your zone 6A we often seen hydrangeas that survive but do not bloom. You might try giving it some extra winter protection (especially from wind) and make sure you do not prune in spring (except to remove truly dead stems or branches) and see if that helps.
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