Landscape Grass Output with a grayscale Mask (not with Layer Sample)?

Hey Frank!
Thanks for your response!

Selecting the foliage tool didn’t work for me unfortunately.

Maybe there’s something else going wrong. I attached 2 images to show how i set up the grass output in my material

Here’s the result when i set it up using sample layer nodes (in this case i mask out only the “base” area).
Grass assets are spawned across the landscape in the predictable manner. All good here.

And here is when i use a simple mask to drive the output.
No foliage is spawned on the landscape. I wonder if this is even possible?
Or do i need to fiddle around with landscape UVs to let the engine know where to spawn grass?

Thanks again!
Best,
Ron