Well, I don't know if they are predisposed or not, if they are then outside influences can change them, and I don't know about any of that stuff from a seedbank, either. For certain I
do know that if you interrupt the dark cycle for an hour during flowering, you
will delay maturity, so that doesn't lend much credence to the other things listed.
That said, the best thing to do is grow a healthy plant. And that means to give the plant enough room to grow, especially room for the taproot to grow downward. Y'know, with a seed plant, the taproot will grow down more quickly than the plant grows above soil. If you crowd that root, or impede it from growing downward, it could signal to the plant to express male. So don't crowd the roots. Do you have at least 6 inches for the roots to grow down?
HTH
