This may be timely for the Northern Hemishericals.
The cultural recommendations given in this video clip are specifically for
Cymbidiums, which are the orchids pictured in the clip. Unfortunately they don't mention this in the clip so don't use this culture info generally on all orchids. There's also a factual error in this clip in that they say the fancy hybrid Cymbidiums are epiphytic but they are not. They are semi-terrestrial.
YouTube - Winter Orchids