I've had this climber in my garden 5 years No blooms ever Lots of growth with last summers plentiful rain Want to prune But how and when?
Why a Climbing Hydrangea on a North Facing Wall Has Not Ever Bloomed
Certified GKH Gardening Expert
Sometimes these are just reluctant to bloom, and have dry spells that can last several seasons or years. There are a few things you can do to help out, though. This article will help: https://www.gardeningknowhow.com/ornamental/vines/climbing-hydrangea/climbing-hydrangea-wont-bloom.htm
And Here is an article on pruning them: https://www.gardeningknowhow.com/ornamental/vines/climbing-hydrangea/climbing-hydrangea-pruning.htm