What material do you use for landscaping and what is the structure of the layers?
it depends on the nature of material, but ultimately you have an alpha for your grass which is where it is JUST grass. that, conceptually/ideally, is what you would feed into your grassmap
what you have going into it for that pic isn’t that, it’s the whole landscape.
In foliage mode, with the grass mesh selected, in the Placement tab use the ground slope settings min and max values to tell were grass still should grow on a slope.
In addition to adjusting the slope, I use texture masks to fully control where the grass should grow.