The Vanilla Vegetation Overhaul improves textures of trees, plants and grasses, but tries at the same time to keep a very vanilla-like look. This mod does change textures of tree branches, most plants and grasses and also adds new grasses for more variety.
Since there is no "grass only" version of SFO for Skyrim SE, when i saw this mod i thought that it would be the perfect replacement in case of a STEP Special Edition.
The only downside (for me at least) is that there is no Realistic Aspen Trees patch yet.