Answer: Hydrangeas should not flower every other year so there's something going on that maybe you're missing during the growing season. Consider the following possible explanations: Late frosts can nip the developing flower buds resulting in no flowers for that year. Or, late pruning can removing the flower buds. High nitrogen in late summer can also stop flower production for the following year. Even if you do not deliberately fertilize your hydrangea, if it is planted near a lawn that you fertilizer, enough nitrogen can leach into the soil near the roots and result in lots of vegetative growth at the expense of flowers.
Hope one of these scenarios fits your situation and you can correct the problem. If a late frost threatens, try covering the plant overnight to protect the new growth. If you prune your hydrangea, do so just as the leaves are begining to unfurl. Finally, if your hydrangea is anywhere near your lawn, don't feed your lawn in late summer.
Best wishes with your hydrangea!
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