I was just thinking about your thread Gina and I wanted to add this point that everyone might want to consider.
In my 9 years in Florida, it was all the rage to mount orchids among the Floridians, especially the "snow birds", the seasonal residents. They had this crazy idea that if you tied an orchid to a tree that somehow Mother Nature would take care of them.
When they would ask me what orchids could be mounted to trees, the most common plants mentioned were Phalaenopsis, Vandas and Dendrobiums by them. Imagine 30'+ Royal Palms with naked trunks hosting Phalaenopsis plants!! They had no concern about sun exposure. They had no idea that a Phalaenopsis would cook in the Florida heat in full sun. How are you going to water it I would ask? Oh my sprinkler system will water them. I asked whether or not the sprinkler system would reach them. They had no clue about what I was talking about.
They generally disregarded the cultural needs of the orchid. No thought about light, shade, watering, seasonal differences. It was just tree + orchid= Flowers. Overly simplified orchid growing. They travelled around Naples Florida, saw orchids everywhere and never had a hint about what they were really seeing. AND THEN they would be shocked when the plants would die. How they would head north for six months and return to find most of them dead. They were flabbergasted. The orchids they were sold MUST have been defective. Otherwise they would have survived if not for the defective aspect.
But anyone CAN grow orchids mounted to garden plants in appropriate climates but you have to match the orchid to its preferred conditions. Cattleyas in 3-4 hours of sun, Phalaenopsis in shade, Oncidium is dappled shade with more moisture, etc. it is never so simple as tree + orchid= success!!