Corona 3.0
V-Ray 3.60

In the archive: max 2014 Corona + V-Ray fbx folder with textures.

For moss the Hair & Fur modifier was used. Units of measurement – mm. The modifier is on the stack but turned off; enable it before rendering. There is no moss in fbx. Screenshot with moss settings in the archive.
On succulents the Turbosmooth modifier is turned off.

In the V-Ray materials in the BRDF section there is a Microfaset GTR (GGX) if your version is older than 3.1 then choose Blinn Phong or Ward – which is preferable for you.