I have a new bed, built up from what was dug out of my pond, that is currently very sandy and lean. I am already planning on planting amaranth Love Lies Bleeding and morning glories in the spot, and have already planted coleus, iceplant, and a variety of sedums. What else can I grow here that will be a good 'in between' height (1-2 feet) that will grow well in poor soil?