Ray is right, of course. I never meant to imply that I had invented this method of growing in water. I had heard of it first on another, ahem, orchid site. Jerry Meola proved it was possible to grow Paphiopedilums in water and worm tea, and he possibly got the idea from Rod Verger.
There are others using this technique successfully, and algae does seem to be the key in keeping the roots healthy and in equilibrium.
It's definitely an indoor method though. I think mosquitoes would find vases of standing water quite attractive to breed in.
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