I opted for the moss from the crafts store. I chose three shades of green moss and a brownish colored moss. By tearing it with my fingers and finely cutting it with scissors I arrived at a size of moss that would be in scale with the miniature wall.
Next I cut sections of burlap cloth to the size I wanted my mass of moss to be. Using a hot glue gun I tacked the burlap to the top of the wall. After adding more glue to the burlap I pressed small batches of moss into place with a metal palette knife.