Seeking advice on mass planting for a long south-facing (but shaded by trees) brick retaining wall. The wall is about five feet high and over a hundred feet long. At the moment I'm thinking of a mass of just one or two types of cascading plant--something with a good 'structural' texture, and that stays green in winter. I have seen some impressive cascading arabis and aubretia, but I am wondering if the wall will be sunny enough to promote good growth, as-- though south-facing-- it is shaded by a long line of trees. And would such plants take years to grow? Masses of lithodora can be breath-taking, but again I wonder how well it will do in partial shade (or would you call that "filtered sunlight"?)

I will try to attach an image to this posting. This is my first post, so bear with me if I get it wrong.

(follow-up during message preview; I see no 'upload photo' option on this forum, so perhaps I can later figure out a way to make a URL link)