Hello,
i was working on some map design and i noticed the foliage spawner isnt able to take a landscape layer into consideration. I built splines/roads on my map and the foliage spawner keeps spawning the trees on the roads - we are still working on the map design itself, so when you make changes for example to the splines you have to resimulate foliage placement which results in having trees being placed again on the roads.
You should be able to set the landscape layer under the placement settings.
I meant on the procedual foliage volume. when applying it on the landscape material you won’t have collision. For gras types it works fine, just wish the foliage volume would consider landscape layers as well.