Is it possible to mass place trees from a script?

I'm aware that it's possible to mass place individual trees from a script, which is basically what I'm doing that the moment. What I want, however, is to mass place the trees the way the Unity editor is doing it via the terrain's "place trees" functionality.

I want to do this so that I don't end up with thousands of individual game objects. I've googled quite a bit, but the few interesting results I've seen indicates that this is impossible - or at least extremely hard...?

Thanks in advance!

 

It's pretty easy. Just use TerrainData.treeInstances