Answer: Hydrangea macrophylla, the common blue hydrangea, produces flowers on new shoots which develop on old wood. If your plant freezes down to ground level each winter, or if you prune it down each spring, it will never have old wood on which to develop flowering stems. It may never bloom for you. You may want to replace your hydrangea with one of the newer cultivars which bloom on new wood (Endless Summer, for instance).
Best wishes with your garden!
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