Posted: Yesterday at 12:44
I think you would be better with a few different clematis on the fence. Many benefit from a bit of shade rather than full on sun anyway as they get bleached. Wouldn't use hydrangea personally. They get huge and never look right on a fence - better on a big wall.
Loads of perennials which would grow very well there. If you have a preference for colours, just say and you'll get loads of suggestions.
A mix of smaller shrubs and a few evergreens will give you all year round interest too - otherwise you're looking out at a very bare space through winter. It's also quite a small and geometric space, so repeat planting of a few well chosen items will always be successful. You can then infill with other shape and colour.