it that were to happen, you should get vines or moss from it. and of course someones going to reply that it would burn and it wouldn't cause i said so ha
Only if regular cobble placed on top/adjacent to grass slowly(very slowly, not like bloody vines) turned to mossy also, to represent plant life slowly growing over and retaking it. Burning would be a great way to keep it under control, especially on castle walls.
Why does everyone think I don't have an avatar? Is there anyone who can see the one black pixel.