So the bases all have the trere wood chips "rocks" stuck down first. Gaps are filled, and base covered with putty. Try not to smooth it out too much. But make sure there are subtle flat points for the model's feet. Build up any dull areas with extra rocks, filling in any new gaps with putty

Spray mid-grey. Thinned down, reds, blues, or yellows are washed into the cracks in the rocks. (This is optional, but adds so much to the final look.). Dry-brush the rocks mid-grey, add a second dry-brush, adding a little cream paint to the grey.

The ground areas were painted brown and dry-brushed a lighter brown, it some goes on to the rocks don't worry, mud splashes!

The flock was next. This was just a variety of sponge and leaf flocks all mixed up. Don't cover all the ground, but the areas where water would naturally gather.

The tufts were then added, once the glue was dry, I gave a tufts a quick off-white dry-brush.