Mismatched Trees

I have made my own gumdrops and i made them trees for my candy car game. The problem is, when i am at a distance, they show up 2D with brown lining on them. they change form only when i get close to them. Is there a reason for this? I have a before and after attached below:

http://unityimageprobs.wordpress.com/2012/01/01/tree-problem/

(sorry i couldnt figure out how to attach an image directly)