Have a look at a pack for Unreal (free in October) that will help you set up nature scenes.
The pack features more than 140 plant species, including 760 HQ Static Meshes:
- 648 flowers and plants;
- 28 vegetable spline elements;
- 84 environment models.
Using the pack, you will be able to create beautiful natural scenes, using flexible settings of wind and material, interaction with the character, high optimization.
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It provides the ability to customize a variety of wind parameters: Waves, Swaying, Simple Grass Wind, Shadow Waves, and other aspects. There's also a system of interaction between plants and your characters.
You can learn more and get the pack here.