I think most people who have trouble with Vanda don't water enough, keep them too cool and/or don't fertilize enough during warm weather.
According to Martin Motes of Motes Orchids, a happy Vanda should have a 1 centimeter wide band of lighter green new tissue at the base of the leaves emerging from the crown. If this band isn't present, the plant is lacking at least one of adequate water, plentiful fertilizer and proper temperatures.
Your vase culture will solve the water problem.
At 68F most hybrid Vandas will hardly grow at all, but will not be in danger. NYC in summer is hot and humid outside, and Vandas seem to love it. Use the Search feature in the top maroon menu to look up the beautiful vandas OB member Bud grows on his fire escape.
There is no point fertilizing until it's good and warm, since the plant doesn't grow much at your temperatures. But when it feels warm to you, fertilizer is important.
As I mentioned, quite a few people run in to trouble with Vandas in full water culture when it's good and hot, and humid. Cooler weather seems not to be a problem with this. I don't know whether it has to do with the Vanda or with organisms growing in the water.
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