The link I posted above contains my notes from when he spoke to our club in 2017. He addressed Den. cuthbertsonii at some length. This time, Thursday June 18 2020, he mentioned it only in response to my question. His topic this time was Cattleya.
He said he uses RO to flush his cuthbertsonii 25-30 minutes after watering and fertilizing. He said they are in the cooler eastern part of a greenhouse, but it still gets well over 100 F / 38C on many summer days. They have survived much higher temperatures with equipment failure. His greenhouses are humid.
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