how do you propogate hydrangeas
have both types
Certified GKH Gardening Expert
Generally, you will want to select a branch of at least 6 inches, and do so when there are no flowers, but new vegetative growth.
This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-propagation.htm
This article will go over several of the types of hydrangeas, and when to prune them, which will be a good time to assess where your new cuttings will form: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/prune-hydrangea-bushes-hydrangea-pruning-instructions.htm