Pruning about 12 inches off the top of my hydrangeas

Question

I need to prune about 12 inches off the tops of my hydrangeas as they are growing above my windows. They are about ready to bloom. Will it hurt to wait until they bloom and then cut them back?

Answer 1

This article should answer your question: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm