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Originally Posted by dionysus  i have had it sitting in a semi-stagnant greenhouse, and it has been doing considerably well. |
Well maybe for the time being but it won't stay healthy in satgnant conditions. Promenaea like pretty much all orchids like and need lots of fresh air movement. It sounds like oyu really should install a couple of fans to get some good air circulation.
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Originally Posted by dionysus any suggestions on reactivating the dormant pseudobulbs? i have one sitting in water, and it has a small root poking out, but the other one is still inactive. |
It sounds like you may have some fundamental missunderstandings about back-bulbs. Once an orchid looses leaves off a mature pseudobulb, sometimes refered to as a back bulb, they don't re-grow leaves or roots. In some species like Lycaste, these old leafless bulbs might rebloom but that's about all they'll do. New growths can come off the base too, but the leafless pseudobulb won't "reactivate".
You have one back bulb sitting in water? So have you removed it? Removign a single back-bulb like that isn't generally recommended. Instead, leave the back bulbs on as they will help nourish new growths.