I have a town house in Hudson, with a front stoop and a lower entrance under the stoop. I’m trying to do a little planted area there, sort of a grotto effect, but so far nothing seems to survive. Very little light, but not total darkness, but almost. An area across from the gate is mirrored and adds some reflected, diffused light. Impatients lasted not much more than a week. I put in Japanese ferns two weeks ago, and they’re already looking pretty pathetic. Any thoughts? The area is about a foot deep with potting soil and lots of peat moss (the area is about 6′ x by 4′) and stays pretty moist. I was thinking maybe some sort of lovely moss might work?