I have 2 Vanda's. Both are in a plastic tube. I think if I have success with Vanda's here in Colorado, outside of a greenhouse, the tube will be necessary. Mine have added a new leaf of 2 since I have had them. I got them a bit of sunburn out on the deck early in the spring when I put them out one day.
I recently removed the dried, dead roots from the Vandas. The good roots have green tips. So I think they are progressing forward.