double retaining wall bed 50'x5'
I am working on a design and there are two retaining walls 50 feet long, 5 feet apart and each about 5 feet high. There is a bed in between the two walls. The wall is made of sandstone, it has fallen down before and been rebuilt. I hope the second rebuild was solid.
I am trying to figure out what plants would be good here. I was wondering if this spot would be naturally moist or naturally dry? At first I was thinking dry because the walls would make the water runoff quicker but maybe my logic is flawed. Now I am leaning toward wet because the water would run into the first retaining wall then go under it causing the bed in between the walls to be wet.
It faces east is in full sun and has sandy loam.