No tree models in my Unity Help!

Hi i am having trouble with my terrain. There are no tree models in my Unity except for one which is just a big long stick and i cant really edit it to make it look like a real tree. So if there is any way you guys can set me up with a download link to 3D trees that would be great. (The download has to be free btw)

Assets->Import Package-> Terrain Assets. I am pretty sure that is where all the pre-made trees are. There is also a unitypackage download with some additional trees at the website.