Shrub for small sunny bed against a wall
I'd like a nice medium sized (4-5ft) shrub to go behind the chair. The bed is sunny and has good soil but not very deep - you can only dig about a spade and a half depth before you hit hardstanding! I'm thinking of Hydrangea 'Annabelle' but not sure if the conditions are ideal. I can water it well - the tap's just round the corner.
Last year I grew a scruffy mess of Luzula, Thalictrum delavayi, Miscanthus, and Verbena in the bed; and Tricyrtis formosa has managed to grow surprisingly well there.
The thought of forgetting about shrubs and growing cannas has also occurred to me; I just think I need something with height and solidity.