I've looked through most of the non-toxic plants for chameleon enclosures, but was wondering about small trees that are common in the US. Has anyone ever used an oak tree, or maple, or apple tree? Has anyone used grape vines as well. I'm going to build a few outdoor cages this winter and was thinking of going the cheap route for plants. Does anyone have any suggestions as to what plants and trees are safe, that grow and are common in the US.