If I can offer unasked advice, I'd go about the greenery in layers from the soil up. And leave a bit of each layer exposed around the contiguous edges (not the layout edges) of each area so that it'll be easier to blend in adjoining areas as you feel up to it. In other words, cover 12" with dirt then 11" with grass/turf then 10" with coarse turf, etc. in whatever order you determine works best for you.
Also, I can't recommend it enough, go with a VARIETY of textures! Too many MR (sorry guys) project layouts use just layers of ground foam and it looks, well, too uniform. It's virtually impossible, technically, for a human to create a truly random expression. Even when we try to be random, it's well, a seemingly random smattering of dark green foliage OVER HERE (vs. over there)...so, see, we've already taken one variable out of it. But let's not to get too mathematical about it...
Try a layer of fine 'burnt' turf, followed by a layer of dark green sawdust, then a bit of medium grind basic green foam then maybe some light green fine foam, etc.
Okay...off to read my son "Henry and the Elephant" (a Thomas the Tank Engine story)before his nap...
Galen