Here in Florida we have had a few cold snaps recently and I had to bring the Vandas inside. I have had this issue previous years as well and learned quickly that with the heat on inside it is very dry for them. If I slack off on soaking them (I do this in the bathtub for about 10-20 minutes at a time and make sure they dry out quickly like they would outside) I have lost spikes that were actively growing prior to being brought inside. So, I try to just soak them everyday now, but I have missed a day here and there, but not two days in a row. I will also lightly fertilize about once a week and use superthrive when I fertilize. I have actively growing vandas so I still fertilize them.
I agree that I would not cut off those roots. There is still a chance to get new growth from them, but you might also get new roots starting from the base of the plant. One of my vandas that lost all of its roots did successfully sprout new roots eventually, but it has not bloomed yet since then and that was about 2 years ago. It is still alive though, so there is hope.
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Hybrid Mode
