Q.climbing hydrangea not flowering at all?
I have a climbing hydrangea I planted two years ago. It is in a southern exposure but has shady from a large maple tree during part of the day. It has not bloomed at all although it has lots of healthy foliage and is climbing really well on the trellis and wall where is planted. What can I do so that it will flower next spring?
Hydrangea Lover
Aurora Ontario

This article will help you pinpoint the cause.
https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-not-blooming.htm