Can I Prune Back My Hydrangeas?
After the harsh summer heat and lack of rain your Hydrangeas may not be as pretty as you’d like. If this is the case and you are curious if you can cut them back here’s the answer:
It depends upon the variety of Hydrangea that you have. Whether it blooms on last years stems (old wood) or on new growth (new wood).
This is general pruning information. I suggest verifying the species you have and reading advice that is specific to that species prior to pruning.