I use relatively weak fertiliser - once a month - and have never flushed my pots. And genuinely - the orchids here just keep growing all the same. But ---- for sure ---- considerations need to be made about frequency and concentration applied.
For some of my pots ----- the pots are quite large - and also deep, and there is a lot of scoria inside the pot, and probably a lot of roots too within. What I don't want to do is to super saturate with a flush --- otherwise it could become watery for a really long time down in the dark depths - which could become an issue too. Probably depends on whether some roots can handle the watery conditions or not ------- ie. even if the pot is very good drainage, the volume of media inside my pots can become an issue ----- water-logging. That's why I usually water a particular way - to avoid water-logging.
As for my other pots - shallower ones ----- pretty sure I could flush those ones with no water-logging issues ----- should be ok to do that.
Also - as for semi-hydro/hydro growing ----- as the roots are already used to watery or lower-oxygen environments --- then flushing is usually definitely ok to do.
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