It was @MostHost_LA, in fact, who pointed out to me that’s it’s possible to get large terrain with grass and trees running on a Galaxy Note. ( With UE4, to be fair ).
I was also helping someone with a project the other day, and they had grass all the way to the horizon. It wasn’t affecting the frame rate at all. It was stylized, but even so. It’s was just using the foliage tool and LODs, although it was an efficient mesh and LODs / imposter.