Scenery Animator 4.0
I've had some success with Raydance's TREE generator. It's simply too
sloooooooooooow at rendering for me to use much.
I believe it can do Bushes. It is HIGHLY configureable thru its Scripting
language. It also has a built in Landscape generator. Not bad for a $50
piece of software but too slow for my tastes even on my 3000