I grow few vandas and try to avoid the small seedlings. The 4 inch pot baggie size from sun bulb at big box stores occasionally request a trip home with me. They do well in wood baskets under 50 percent shade cloth sitting or hanging in an open area. They need daily watering with a misting want until all roots turn green and sometimes more that once, depending on air movement.
They love the rain and consistent feeding. Vandas are always growing and benefit from constant (weekly) feeding.
they do not like cold temps lower 50s.
If you have a green house then you can grow them free hanging on a wire and will do just fine.
I grow in the Gainesville area.
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