I only have to Catasetum type orchids. I grow them in bark. When the new growths are a couple inches tall, I start watering very sparingly. I water once, and then wait until it is bone dry to water again. I know this is earlier than is typically recommended to begin watering, but my plants grow like crazy and get bigger every year with more flowers every year. I know I'm only one guy with only two plants, but that has been my method, and it has worked for me. Maybe the proper time to start watering them isn't such an exact science after all.
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