I've been learning to use UE4 for a while and this is the scene where I've been practicing.
I have added a material that applies a different texture to the ground depending on the slope. Also, each texture has its own foliage (Stones, grass, everything I want to add). The color and height of the grass varies depending on the gradient of the texture underneath.
Both trees and grass move in the wind. The force and direction can be changed within the parameters of the textures.
To finish, I have added niagara stylized wind particles, and a cell shaded post-processing effect.
Sorry for the low quality of the videos.