Pinetree
Sort of low poly.
The 'master' tree is on layer 20 using emptys to instance the branch models.
These are all collected into a group called 'Pine Tree'
Layer 1 has an empty set to dupli the 'Pine Tree' group
Layer 0 has my human scale model
which I use to scale all my models
to.
Short answer: you dont :(
Longer answer: I tried making this with the Array modifier, it got really high poly really quick...
You can edit the 'master' tree on layer 20 by moving the individual 'branches' around... because it uses object instances it's not nearly as memory hungry.
Cool, but how do you make it a mesh so you can edit it?