Shame I did not know this at the time, I would probably done it.
The trees and all vegetations are the real thing. I have always used what nature has to offer since I was building 1/35 scale armor. The trees are small branches broken of a bigger tree. The grass is moss and the rest are tree stems and whatever looks the part. I always choose particular ones because not all branches will look right. And not all moss will produce the same effect.
A thousand thanks to everyone else who has replied. I do appreciate your comments.