Skyrim - Flora Overhaul is a free mod that completely overhauls your flora in Skyrim.

Create more dense and luscious foliage

Skyrim - Flora Overhaul is a cosmetic mod that changes the way trees, flowers, plants and grass look. Trees look more real and are positioned in a much more realistic manner, and the tundra has lots of grass strewn about. In a game with as many forests and trees as Skyrim, this has a big visual impact.

Add variety to the environment

In addition to changing the look and feel of the flora, Skyrim - Flora Overhaul also adds much more plant variety. Trees and plants will better reflect the local environment, whether cold and snowy or dry and temperate. Vanilla Skyrim tends to reuse a lot of flora by default, even when it doesn't quite fit with its surroundings.

Create dense forests at a cost

A trade-off of adding denser forests and more plants is that the game may crash if your device cannot handle all of the new flora. That's why it's recommended to combine Skyrim - Flora Overhaul with a mod like Skyrim Performance Mod to help reduce as much performance loss as possible.

Has some compatibility issues

Unfortunately, Skyrim - Flora Overhaul has some compatibility issues, particularly with mods that add things to the overworld. Since this mod adds many more trees, they may block paths that normally don't have any tree there, which other mod authors cannot anticipate. It's recommended to perform a stress test after installing to check for any issues.