Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Mobile Environment Pack Free.
Mobile Environment Pack
This pack is uber low-poly, diffuse only including LOD groups for the highest optimal performance.
Bushes : 4 species in 45 variations.
Grass : 4 types in 42 variations.
Plants : 14 different species in 88 variations.
Trees : 10 species in 156 variations.
Underbrush : 8 types in 68 variations.
Cave-Kit: 64 Prefabs, cave-walls, stalagmites, crystals, spiderweb, etc to build customized low-poly caves. .
Rocks & Stones : 13 different types of rocks and stones from small to big in over 410 variations. .
Buildings : 6 different types of shacks in 12 variations + 32 add-ons in 64 variations like fences, roofs, stairs, walks, walls, etc. for unique looking villages.
Props : 46 Prefabs.
Terrain Textures : 16 textures.
FX : Over 4 Shuriken Particle Effects and 2 different light-cones.
Scripts: Collision based renderfog, sky-box color and light fading script.
Scenes : 10 demo-scenes, and 5 inventory scenes.