Most people water bare-root Vandas every day. Commercial Vanda growers in hot, humid south Florida water every day, and twice on hot days. Less than that and they quickly begin dessicating. When I have bare-root Vandas shipped from nurseries they arrive with fine linear streaks in the leaves, indicating shriveling, after only 2-3 days without water.
Vandas have the potential to make one leaf after another through the year if water and temperature are correct.
In a warm home with low humidity (perhaps less than 60%) watering even once a day is often not enough. When I was growing them in the house in glass jars I needed to soak them for about an hour a day or they began shriveling.
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