lol, I hear you bullet1968. There are several sites where you can get trees and stuff but I prefer to model my own, that way I can get the look that I want. The more control I have, the better I like it.
However, if I was going to just do a single still render, I would definitely consider using someone elses tree/shrubbery models. Or even use the paint brush trees and convert to poly's.
Don't be satisfied with what you can do but rather strive to do the things you can't do!
Exceed Expectations!