Answer: Hydrangeas produce flowers on new shoots which develop on old wood. Your hydrangeas are in the process of maturing their current growth which will be considered old wood next spring. So just allow your plants to become established in your landscape this year. Early next spring, just as the leaf buds begin to swell on the branches, cut everything down to about knee-high. New growth will develop on this old wood and the new growth should produce flowers at the ends of the branches. Enjoy!
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