I bent the ends of short pieces of wire into a loop (or something almost a loop). I then dabbed the ends in white glue and sprinkled some static grass fibers over them, while gently rotating the wire between my fingers. The wires were then set aside for the glue to set
When the glue had set I sprayed the fibres with hair spray (but any spray adhesive would of course do) and sprinkled on Noch 2.5 mm Scatter Grass. For some bushes I used "Forest Floor" and for others i used "Meadow". Some got a combination of both.
The pictures below shows the procedure .
I then planted the bushes at various locations around the layout.