I have heavy clay and a full sun side , I bought a few laurels to dot between trees (rheum , hazel, silver birch) I also have red and yellow dogwoods, broom deep red and a yellow, spirea snow mound and japonica forget name pink and white flowers) , potentilla , roses, bamboo, I'm on acid so going to plant a rhododendron into my new bed , also buddlea , clematis , weigelia , viburnum ..