In the early days of fem seeds, some (most?) breeders would use light torture or heat stress etc. to get the nanas. Problems occurred when the customer accidentally gave their plants the same sort of stress. Here come the nanas.
Colloidal silver has the advantage of never happening by accident.
Another method is to start the daddy female earlier. A female left to grow way beyond the usual chop time is likely to throw out nanas. She's pitching pollen just as the ladies next to her are ready to catch pollen.
If looking to make fems, I'd suggest starting with F1 regulars and do a keeper hunt first. Fems aren't bred to give keepers. (Although that can happen.) What the breeder is looking for is consistency. Customer buys and grows 10 fems and ideally they're all close in quality. With F1s, customer gets an average of 1 keeper per 4 females. The other 3 females might be a bit meh but who cares, the keeper is brilliant.
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