Here it is without the plants: But you should follow the link above: First make the stone shader for the big stones, then the stone shader for the "small" connected under the "big". Copy the big one (must be an exact copy of the big one) turn the colors all up to white, then connect the copy of the "big" stone shader to the mask input of the "small" stone shader. In the small stone shader check the invert mask. (I added another stone layer of a bit bigger "small" stones with another exact copy of the big stone shader as an invert mask.)
