Being short of cash and not having had much success growing one, I rescued a frail looking red maple from Homebase several weeks ago for a couple of pounds. Unfortunately, it's not showing any signs of recovery. I tried feeding it, watering it more, watering it less, putting it in the sun, putting it in the shade, out of the wind... Nothing seems to be helping as yet. It's still crispy around the edges of all its leaves and just as unhappy as it was when I bought it. Any ideas?