OK, in that case, I'll do a soil test. I'll probable plant a few spots with seed next fall just to see what happens. All of this is on a north-easterly facing slope, and it is very impressive how just a few yards away from this fern forest is that area covered in club moss that I previously posted, and then just a few yards from that is an area where ginseng (that I planted) is growing well.
I guess the idea of making sure to find the ideal 'micro' climate for your plants is important. I'm trying to keep this thing as low effort as possible (I'm trying to keep it wild and avoid any spraying, tilling, soil amendments, etc (but I don't mind shooting a turkey or deer or two). So I'm just trying to find where it grows the best naturally, and then just plant primarily in those locations.