Foliage paint groups

I have a slight problem. I have 3 different grass models and one flower model which I need to paint. To place the 1st grass first, then 2nd one and finaly the 3rd one with flowers later is kinda hard to pull off especially the density. What i need, is a way to paint all 4 of these models at the same time. Kinda like a group. Now I know about the foliage spawner, but that way isn’t as artistic, since you can’t paint where you want trees and where not.