We have a waterfall that goes into our swimming pool and the backside of the waterfall is currently grass. Needless to say it is a real pain to cut, so we want to take it out and landscape it. The area is about 15' across and 4' high. I like tall grasses and am thinking about putting them on either side of the waterfall but am stumped about the backside where the grass currently is. I have thought about just planting ground cover - ajuga maybe - but wonder if I should also have some actual plants. This area is in full sun. It is a fairly steep slope right now, but we could probably change that. Any suggestions?