The tree tool generator is made carefully for making procedural trees. You can make your own trees and use them later in your project and maybe scatter them using Scatter tool. Its optimized for heavy scenes.
What can I modify?
you can select the leaves group or you can add your own
you can use generate botton to get random resultes
you can control the leaves density
you can adjust bark material
you can adjust leaves scale
How To Use?
Follow These Steps:
click on assets botton
go to the trees tab
select the tree that you like
press add a tree
start modifying your rock using the parameters
you can move/delete/draw/extrude its control points and get different results