Then I have a question Ray. What mechanism in repotting and using new media deteriorates the old roots? Unless something stresses the plants root system, it should continue to grow regardless. As far as I know there is no symbiotic growth of bacteria that is disrupted by repotting. I have repotted many orchids where there has been not even a hiccup in the root system. I have posted pics of rescue phals repeatedly that show continued growth of the root system and that included repotting into different media. But...you are correct if you are referring to old roots on old pseudobulbs that don't need the old roots anyway and they just stop growing and their moisture and nutrients are sent forward to the new roots growing on new growth anyway. Cattleya's and oncidium's roots on old pbulbs usually die back within a season or at most two while new pbulbs grow new roots. So I am very interested in what mechanism is at work deteriorating the roots on an orchid when it is repotted. Maybe I can learn something I didn't know before.
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