We have a rock wall, only a few feet high, that's up against a fence. There's about an 8 inch gap in between the rock wall and the fence. I have no idea what to plant there! Currently, it's infested with weeds. This area gets full sun. I'm not looking for something that creeps down the rock wall, but something that I could plant in that small of a space that gets relatively high (at least 24 inches??) Is there such a plant?? Thanks!!

-- Newbie gardner