Block out grass renderer

In my landscapematerial im blending grass, dirt and stone textures with slope/height, and after 4.8 i implemented the grassrenderer to add real grass everywhere there is not dirt or stones. Works fine but the grass grows throu roadsplines and all other meshes i have placed on the map.

Any way t block out the grass in selected areas or stop it from growing throu roadsplines etc ?

Any ideas that might point me to the right direction would be great :slight_smile:

Have no one other then me had this problem ?