There are several reasons why hydrangeas do not bloom, and over-diligent pruning in the fall is one of them. The plants have already set buds for the following spring. When pruned, the flower buds are actually removed. Leave your hydrangeas alone this fall,except for feeding them in fall or spring. Also, is there a lot of nitrogen in your soil? You can determine the answer by having a soil test done by your county extension service. If there is too much nitrogen (perhaps from fertilizer runoff from a lawn)in the soil, it encourages big leaves but no blossoms.
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