I have some large, healthy hydrangeas that refuse to bloom other than perhaps one large bloom per year. What is wrong, why won they bloom?
A. If you are meeting water and sun needs, the only other obvious cause of lack of bloom is improperly timed pruning. Prune the plants immediately after bloom, so that the new growth will be able to develop flower buds in the fall. Pruning in the spring or early summer removes the fall-developed flower buds, preventing bloom for that year.
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