I have a dwarf wall approx. 30cm tall that curves around a border in a u-shape. It's a retaining wall so needs to be there, but it looks old and has a lot of small areas od damage (frost damage i think.) I was thinking of planting something behind it and then trying to drape it over the wall and cover it. I have seen this done with ivy (lots of small plants places at intervals and eventually they cling to the wall and cascade over it. ) Would I be wise to do this seeing as how there are parts of the wall that are crumbly. However, the structure is sound, the damage is only superficial, yet. Anything different i could use? What is the plant that has hundreds of little purple flowers on it in spring? I often see it in front gardens when driving past. Something evergreen would be ideal. Is there a variety of ivy that would tear the wall down?