Withhold water in Winter?

[Acharn]

That's helpful. I've ordered a book, Dendrobium and Its Relatives. I hope that will help me get a handle on what I've got, but I'm a little sorry all of mine seem to be hybrids, rather than species, so it's harder to find growing advice. The other main type I have are Vandas, but they're in all stages of growth. Several of them look like they're several years from blossoming.