Changing foliage density scale to specific foliages

Hi all,

I was wondering that is there a possible methods to use those foliage.DensityScale to some specific foliage? For example, if I have three types of foliages: two grasses and one flower, and since those flowers wouldn’t have such effect to performance compared to grasses, I wouldn’t want to reduce it as much as the two others. So it would be better to decrease grass density to something like 0.1 while keeping flowers at 0.5.

So, are there methods to tell that which foliage types I want to reduce rather than reducing all?