I want to remove all the grass from my backyard and replace it with small stones. When I have used small riverstones in the backyard before,it seems that they disappear in a few weeks. I should tell you that I live in south Florida and I think the sand just eats them up. Is there a way to set the stone on something (short of a concrete bed) so that I can remove the grass, cover that part with stone and maintain my flower bed around the walkways. Thank.