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Cattleya walkeriana with black spots on leaves Black spots on several orchids
 
 
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Old 06-30-2019, 12:10 PM
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Black spots on several orchids Female
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Your water is quite good enough for the Cymbidiums (and for many other orchids as well) I would suggest saving your RO water for those types that really do appreciate it.. Pleurothallids especially. Also Miltoniopsis and some of the other Oncidium tribe like pure water. But Cyms really don't care - your water is quite good (no matter what the exact mix of minerals, nothing is very high)
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