Thank you so much for such a quick answer.

I was thinking about parents (not mine, but tree parents), and I think my situation is simpler than "yours". As every voxel world, I work with chunks (8*8*8), so I can simply set chunks as parents. Any change on trees in chunk, parent is easy to find and notify.

But I think chunk is too small of a measure. Trees are usually 5-10m apart, so there will be about 2 per chunk. 

Maybe I should have 1 parent tree per 8 chunks... What's the recommended maximum distance between the parent and a child tree, so it would still look smooth?

So, I need to:

add LushLODTreesManager to the scene,

add TreesRoot,

use your prefabs using my instantiate script and add them as children of TreesRoot,

tell some tree or other game object that it has these trees as children,

add two scripts to the camera,

rework your settings canvas into my "trees settings" so players can set things by themselves

Thanks again,

Karlo