Since I do a lot of smaller scale stuff, I have been doing this:
I purchased some grey and brown crushed stone from Busch (their "schotter 7061 for the brown). The stuff is mainly used as ballast. I also use wax paper and some thick, clear drying white glue (like Woodland Scenics "Scenic Glue"- S190).
I start by laying down several rather thich lines of glue on the wax paper, being careful to keep them separated. While wet, I apply (sprinkle)the crushed stone by the pinch-fulls (between the thumb and forefinger) to cover the top and sides of the glue, making mounds. A small putty knife helps further shape them after about 10-15 minutes while it's still wet, but "putty-like". Allow to dry.
Next I shake off the excess that did not bond with the glue. At this point, I can either use what I have done as stone walls or a base for a line oof hedges. If used for stone walls, I slop on either a gray or Burnt Sienna wash over the dried mounds- allow to dry and dry-brush a "Lighter Shade of Gray" (Sorry Procol Harem fans).
For hedges, instead, I take foilage (like Woodland Scenics Coarse Turf- "Burnt Grass"- T1362 or their "Underbrush" Light Green- FC1635 and sprinkle it (and in some cases, "pinch it" onto another layer of white glue (Elmers works fine and is less expensive). When dry, I mix a 50-50 solution of white clue and water in an old spray bottle and liberally wet it all down.
The stone walls have a rubber-like texture that will conform to small undulations. Remember to make 60, 90, 45 degree corners/angles to meet your special needs to wrap around your fields.
The hedges are nice, stiff and look great. The weight of the stone base not only gives a decent representation of the conglomerate hedge base, but helps keep it from moving around to some degree, on the table.
Hope this helps some folks out there try their hand for smaller scales than those destined for use in your excellent video! (Yes, this is also cheap as chips as you blokes say!…I love that expression!)
v/r
Tom