Making autos Fem seeds in a 2x2 Tent?

[G-paS]

This question was answered here 4 days a go. I hope the advise here helps.

Reversing auto strains with STS

I’ve been hoping to reverse 2 Widow Maker Auto plants out of the 6 I started awhile back. I think I may have started spraying too late, so think this attempt may be a failure. All 6 are in flower now. While tending to them this morning, I started thinking about starting more seeds for reversing, and starting the spray earlier…and I got hung up on a question. If you have some regular seeds, and you have to spray them before they go into flower, how do you identify the females to spray? Seems…