Foliage painting not working at all? (4.8)

Hello. I’m trying to paint some foliage into my landscape using the foliage tool, but it doesn’t do anything. I am in the correct level, I have several static meshes in the foliage tool, paint on landscape is checked. When I hover over the landscape, a sphere appears, presumably where the foliage would go, but when I control click, nothing happens. I’m sure I’m missing something simple :confused: Thanks very much for your time.