@kevin r Well, some growers don't flush at all. Some growers will do a 5-day flush, some 7-day, some 14-day. When I'm growing with bottled nutrients, I'll typically flush (or cut off nutrients) a week or so before harvest depending on how the leaves look and the trichomes. Flushing is one of those things I recommend you try both doing it and not doing it and see what works best for you.
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Beautiful job! You made a great recovery with these plants. I'm so happy to see how far they have come since the beginning.