I've been thinking about throwing some orchids up in some of the trees out back. I know oak trees are great, but I have read that some trees such as walnuts I think have some kind of acid that does not agree with the plants. I have an orange tree with an amazing gigantic air plant growing out of it. Has anyone tried an orange tree for mounting? Just curious. Any input on the idea? I just dont know how it would react to citrus.