Thanks for the nice comments, guys!
I use a bunch of different stuff for ground cover…A lot of it is natural…sifted dirt, ground up leaves, small twigs…I also use broken up bits of plaster that I paint to look like loose rock, & lately, I’ve started mixing wood ash with sifted dirt, & using that for ballast…I use bailing twine (jute) to make tall grass, & of coarse, there’s plenty of Woodland Scenics ground foam in there, too