Having fun with Side FX Houdini and Redshift render in my free time.
RBD sim - Bullet with constraint networks
Tree rig/sim - wire sim for trunk/branches/twigs
Leafs sim - bullet with constraints and POPs
Grass sim - wires + pointdeform
Soil - POP grains
Dust - Pyro
Rendered in Redshift for Houdini. Lit with single HDRI dome light, rendertime displacement used on the solid chunks. Grains rendered as particles. Dust as native Houdini volumes with RS volume shader. Motion blur on everything. Render times were very reasonable. 2-3 minutes per frame on single 1080Ti and around 3 minutes on 980Ti at full HD.