Determine whether you live in the right climate to mount the orchid plant outdoors. The right climate will depend on the species of orchid, although generally orchids grow well in milder climates. Research the natural origins of the species of orchid.
Locate a tree that will provide the orchid with partial or indirect sun. The orchid plant should not be in full sun or in dense shade.
Place a small pile of moss in a crook of the tree where two branches meet. This spot will be the easiest place to mount an orchid because it will stay in place better and have some measure of protection.
Mount the orchid by setting the roots into the moss. Secure the orchid plant by carefully tying it with fishing line or a strip of pantyhose.
Inspect the orchid plant at least once a week to monitor how well its roots are anchoring and clinging to the tree. Repair or retie the fishing line or pantyhose strip if it comes loose. Remove the line or strip after the roots start clinging firmly to the tree, usually in two to four weeks.