I want something for the top of that wall. Below are daylilies, coreopsis moonbeam, lantana. Above are knockout roses (pink and red), salvia (blue bedder and Mystic Spires), some artemesia (maybe a groundcover variety?), grasses, and veronica speedwell. I need something that can withstand very dry soil as this slope tends to just funnel the water straight off. It gets morning sun til about 1pm. Hard packed clay that I have been working to amend with little success. Nothing invasive, please. I already have vinca major and English ivy.