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This is a paid asset, but now you can download Mountain Vegetation for FREE, but please keep in mind this package is provided only for learning purposes or to be able to test before buying the product, NOT FOR COMMERCIAL PURPOSES.
Detail this asset from Unity Store: Original Link
Mountain Vegetation v1.0
This pack contains 20 mountain trees (60 including all LOD-stages). Textures for the trees are combined into 3 atlas textures. This way you will save a lot of draw calls (a scene with all 20 trees renders with only 44 draw calls in Unity).
Unity’s ambient-occlusion nature shaders are applied and additional collidable prefabs are available.
A video of a sample terrain in action can be seen here.