I used to use it. You can get quite a convincing coarse soil effect by pouring a wet layer then sprinkling a layer of dry powder on top. The powder absorbs the water from the poured layer. Let it dry completely then brush off the excess powder. You’ll be left with a nice soil texture.
But now I use acrylic texture gel. I mix in paint, sand, small roots, twigs, static grass, etc. I find I have a lot more control over the groundwork with this method.
Hope this helps,
Gerald

I use an old toothbrush to texture the putty for groundwork.
Just stipple lightly for a good effect.

Malc