I'm not quite sure I understand what you so I'm going to answer the question "How would I model cut grass on the safety guard and wheels of a lawnmower?"
For that I would use fine sand mixed with white glue or even an epoxy like green stuff.
I use the sand/glue method to represent less "gravelly" ground. Just pick up whatever is outside your house/apt in a container, then wash it. To wash, fill up the container with water, stir the mixture up, then carefully pour out the water. What will come out is dust, maybe a dead ant, twigs, and most of what makes the dirt that dark dirty color. What's left is fine to coarse sand with some interesting pieces in it based on where you live (in upstate NY I get perfectly sized pieces of slate as well). Now mix the now slightly damp sand with white glue and apply carefully to where you want the grass to be. The fine sand in the mixture should help it look a little more smooth. When it's dry, prime as normal. Wash with a brown wash and then dry brush lightly with a dark green or a lighter green mixed with brown to simulate the newer grass being less dead. At the end I would also be tempted to add a bit of brush on matte sealer and then apply just a couple fibers of static grass. The sealer in this case is only there to hold the static grass in place, afterward you can seal it however you would seal the whole mini.
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