You did absolutely the right thing in prioritizing preservation of roots. On general principles (for all orchids) don't worry about getting all of the old medium out. The bad stuff pretty much washes out. the rest isn't hurting anything. The next time you pot (in a couple of years) more of the old stuff will be easy to get out. Oncidums do like to stay on the damp side - so just observe and you will get a feel for watering frequency. (How fast plants dry is dependent on your heat, humidity, potting medium, pot...and likely is different than mine) So getting it right for you will just take some observation. The pot-weighing trick works well... weigh it right after watering, using postal scale or kitchen scale. Then weigh in subsequent days. When the rate of weight loss declines (not that much more water to evaporate) it's time to water again. Let the Phals get to "barely damp", the Catts to "rather dry", Oncidiums and Paphs to "still damp".
Last edited by Roberta; 10-18-2021 at 11:33 AM..
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