No, not the internal grass. It's quite simple basically; just one or two fake stones in line with very high setting 8-12 for height, none for the bulging (zero), and a small size; 0.005 or so, coverage 2, then some mix of colors, but no further displacement. You could add a reflective shader or a Lambert shader for some shiny grass or translucency. Anyway; there are clipfiles around also.
But beware; it only gives nice results on a bit of a distance and with quite high detail settings, so good for distant hills.