You can get this on UE Marketplace: https://www.unrealengine.com/marketplace/forest-starter-pack
My latest piece based on a Redwood Forest. This project was made for Jeremy Huxley's CGMA Vegetation and Plants for Games course.
I want to say that this is my first time creating foliage from scratch so comments and critiques are more than welcome. My main reference was based on Willi Hammes' Redwood Forest.
Plants were modeled in 3ds Max, textures were created in Substance Designer and Zbrush. Rendered in real-time with Unreal Engine 4.