Here is another picture. I'm not sure how to cut these back.

Why do you think they need to be cut back?

double post

This post was edited by SouthCountryGuy on Wed, Aug 7, 13 at 13:45

Endless summer hydrangeas don't need pruning, only prune if they get to talk or if you want then to be shaped a certain way, unlike other hydrangeas endless summer blooms on old and new wood

You can deadhead the blooms instead of pruning. That usually triggers a new flush of blooms with ES ... although I am not sure if your growing season will allow one more flush.

See 'Removing Old Blooms' in the link below.

Here is a link that might be useful: Pruning versus deadheading