There are some Vandas that are cold-tolerant and can grow outside. The big, bright hybrids mostly not. (They nearly all have a lot of V. sanderiana in them and that's definitiely a warm grower) But V. tricolor, V. cristata (and their hybrid V. Paki) do fine outside. Also V. roblingiana, V. coerulea do quite well, And for color, there are some Renantheras that are cold tolerant as well (like Ren. imschootiana, Ren. citrina, and several others on my list) , When you're looking at the species, to make a good, educated guess about cold tolerance, go to
orchidspecies.com If they come from elevations above about 1000-1200m near the equator, or even only a few hundred meters farther north (like southern China) they will be cold-tolerant. Example, the genus Cleisocentron (gokusingii and and merrillianum) from Borneo (very tropical) from elevation above 1000 m, not only tolerates cold, but the flower color is better in winter than in summer (both species bloom 2-3 times a year) and have truly BLUE flowers...the flowers of the two species look identical, the plants are different. ("coerulea" is blue-violet, not truly blue but is as blue as most orchids get... These little guys are actually blue)
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