I think flushing is a nice way of putting a soft end-date to a grow. As the plant is running out of nutrients it will develop in a different and more visually spectacular way, over a plant you just keep feeding your regular nutrients to harvest. I tend to get this feeling when running full nutrients --maybe another week; yeah.. one more week, just 2 more weeks.. until I have a monster that risk catching mould. Whereas on the flushed plant I might think --one more week and after 2 weeks it's so obviously ready I might even reconsider mid-week and do a chop because it looks ready! 😁👌.
I run my plants 100% closed-cycle, runnoff collected and re-used by the soil zero drain to waste, so no "flush". But I only feed water at the end of the grow to get said "soft-end-date" that will eventually determine when I get this urge to harvest.
If I was growing to feed my 100 kids, then I'd go with the no-flush approach to maximize harvest-weight.
But.. I'm not, I'm looking at my plant's as instagram models that needs to look good too, not just produce a large harvest! 😋.
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