tutorial on trees

Hey guys im trying to make a disc golf game within this there will be a decent amount of trees some small some big, evergreens and what ever else I was curious if there was a tutorial on trees so I dont have to start from scratch and figure out how to make them. Also if the tutorial goes into depth about how I can make them move while using some wind efect would be great but if not I can figure that out later when I get this far.

Some people use L system.
http://lsystem.liquidweb.co.nz/