Fallen trees

Based on some models from speedtree available here :

Weeping beech :

https://store.speedtree.com/store/weeping_beech_species_pack/

Water elm :

https://store.speedtree.com/store/water_elm_species_pack/

Shagbark :

https://store.speedtree.com/store/shagbark_hickory_species_pack/

Grass pack :

https://store.speedtree.com/store/tall_fescue_grass_pack/

Picture based on a render from Massimo Verona using speedtree, some megascan elements and Bryce 7.1 pro.