Answer: Hydrangea serrata Blue Bird blooms on wood grown the previous year, so do not prune it in the spring before bloom time or you will be cutting off the current crop of flowers. In general, hydrangea pruning is done only to remove winter killed material (this pruning can be done in the late spring once you are certain a bit is truly dead), and then possibly to thin the plant should it ever become too dense. Thinning would only be done in the summer immediately after blooming. Enjoy your hydrangea!
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