I'm planning on doing something similar, bringing them outside but not mounting on trees. I would not bring them outside until they grow to about a 2.5" to 3" pot size. My experience is that anything smaller e.g. the seedling size from Maui Orchids, LA Orchid Connection or Orchids by Hausermann wouldn't be able to take the temperature swings. Some of the Maui and Miranda Orchids plants in 2" pots I put outside turned brown before I noticed (though some others are showing new growth). I imagine it could be possible growing outside if it's a mild climate and you put a timed mister up to it several times a day, shelter it from strong winds and use an 80% shade cloth, etc., cause I'm always thinking about how I can move these out. But at that point we're kind of in uncharted territory. Once they reach 3" pot size and up, most of my orchids can sit outside in the shade with limited maintenance (zone 10a, sunset zone 20).
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