Years later I have a similar problem. I’ve set up the landscape grass type, made the blend so that the grass layer is set to 1 and the rest to 0, but I’ve still got grass on road/dirt that have > 0% of grass layer in it. Its funny that I’ve got grass on a dirt patch only to find out that it isn’t 100% dirt but something a bit lower since you can’t see an ounce of grass layer on it. Is it possible to make the grass only appear on grass layer if say grass is painted 80% or more? It would help me with performance, as foliage painted grass needs to cast dynamic shadows to look properly, as it doesn’t receive static lighting from cliff mesh, while landscape grass can pull that up from landscape lightmap saving me some nice fps.