I just saw a bunch of Vandas at the BBG.org and most have keikis. But only the larger ones. Some look great and some very leggy. long stem not many leaves/ roots. But the best ones are a tangle of lush leaves and keikis. Maybe you could use some keiki paste - some people say it works. I just saw a Vanda keiki that was blooming with a terminal spike. The plant was attached to a way larger one. You can't see it well from the photo but that was a keiki attached to a huge one.
I think if you chop off plants they tend to grow new shoots. I did that with reed stem Epis. I planted some Lemongrass I got at a west indian market just for cooking and the one that sprouted was the one that i chopped the top off and planted just the bas, a couple of inches of the basal stem. I am sure if your Vanda is large enough it would send out new keikis if you chop the top off. I wonder if they can get keikis on the flower stems like Phasl - wich are in teh same tribe.
I think in nature probably Vandas are not an individual plant but a clump of keikis.
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