I have mounted orchids, bromeliads, and anthuriums onto trees and totems. The Vandas I have that grab onto things usually grab on to something that has coco coir or moss are root into them. You can mount them to the trunks of trees, but it needs to be a rough woody trunk. Growing mounted vs basket or potted requires a lot higher humidity all the time. This Vanda was mounted to a tree at the beach at a house we saw when we were walking by.
