How to block foliage growing through Static Mesh!

Manually painting I can block Landscape Grass Types from spawning through static meshes - rocks, and floors etc, but can I “extend” static meshes to have a boolean flag defaulting to BlockGrass or better still categorise static meshes and do similar setting all SM in category?

You have to tweak the grass ( and mesh I think ) material. See this

Thanks @ClockworkOcean will give it a look see.

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