I provided a link below so you can see the quality of the trees, they are plastic trunks that you add the provided foliage to. I figured for 1/72 scale, those are perfect since the detail of real wood is barely neccessary, if at all. (If you can't tell, with the need of almost 80 trees, I'm building a BIG diorama.

http://www.sceneryexpress.com/prodinfo.asp?number=WD1101
- John