Go grab a free pack of assets for Unreal.
Check out a pack featuring photorealistic, photoscanned poplar/aspen trees, foliages, ferns, shrubs, rocks models, photoscanned terrain textures and material sets. The pack can help you set up spring, summer, autumn and winter scenes.
This pack contains:
Please note that all flora elements have spring, summer, autumn and winter versions. The pack includes two versions of medium and big size trees (urban and forest). Also, all branches and foliage assets have wind animation and color variation depending on their position on the map.
You can learn more and get the pack here.