| While it is a good idea to isolate the plant and while many of us routinely check the roots of each new plant we get, that's really as far as we should go before suggesting ny further cultural changes.
What if the plant is a Phal, Paph, Masdevallia, Phrag or some other moisture-loving orchid? Repotting it into a fast drying medium and letting it dry out is a recipe for stressing the plant.
Because different orchids require slightly different care, it's best not to make any cultural recommendations until we know exactly what kind of orchid we're dealing with.
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