The only zone lists available for orchids are for terrestrial orchids such as Cypripedium, certain Disas, Bletillas, Pleiones, Platanthera, Galeandra, Aplectrum, Tipularia, Calanthes, and probably a few others I can't think of at the moment. Even then, there aren't many references to them. I don't even know how accurate or precise some these are, as most of the info comes from the net. However, for Cypripediums, there is a book dedicated largely to their culture and a few other hardy orchids, so finding info on them won't be too difficult. The author to the book about growing hardy terrestrial orchids is John Tullock.
Epiphytes on the otherhand are a whole different thing. To my knowledge, there isn't any reliable information about zoning with them. But epiphytes are so commonly cultivated by comparison to terrestrial orchids, that finding culture information on most species will not be terribly difficult. Unless...you decide to go nuts and buy some ultra rare orchid that few people grow. Then you're pretty much on your own.
If you happen to get in a situation where you plan on getting or are getting a very rare orchid in cultivation, then I can give you a few hints to start off with...:
1. Check Jay's Internet Encyclopedia whatever tiny bit of info you can glean off it.
2. If you know the country of origin from where the plant comes from - or even better, if you know the exact region or range of habitat the plants grow in nature, research the area.
3. Take into account any kind of climactic norms and variations in the area in question.
4. Ask yourself why the plant is rare in cultivation. It could be because they're endemic to a certain micro-environment and micro-climate.
These are just a few things to take into consideration if you hit a roadblock. Basically gather up every resource you can, cause if it's ultra rare and you wanna grow it and keep it alive, you better put in the time and effort.
Otherwise, if they're commonly grown resources are limitless.
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