Vase culture is your friend if you want to grow Vanda indoors. Place the Vanda into a vase that is large enough to accommodate the roots. To water, fill the vase up to the vase of the plant with water, or a very weak fertilizer solution, and let it be for an hour or so. Then drain all the liquid from the vase. Wait until the roots are all white before watering again.
If you want less work, net pots, the ones used for hydroponics, with 80% bark mixed with 20% sphagnum moss also work very well.
Either way, the most important thing when it comes to water vanda is to wait until the roots are all white, then water until they are solid green.
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