How to force plants to show sex?

What is the best way to force regular plants to show sex? im growing 3 regular plants and 1 fem under a scrog but i am not 100% sure what is the best way to go about this situation. i am trying to save as much room for buds and the regular plants are not mine.

I need the sex to be extremely noticeable for the owner to confirm they are males so i can chop them. I never grow regular seeds so i have no idea how to go about this the easiest way and when would be too late to reveg.

Flip to 12 12 and see what pops out. Or 4-6 weeks veg will show you too.

macsnax said:

Flip to 12 12 and see what pops out. Or 4-6 weeks veg will show you too.

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How far into the 12/12 is too late to reveg? i am pretty sure they are males just doing it for the owners sake he doesn't know how to sex and wont let me chop

You can reveg at any point. How far into flower and how much gibberellins have built up, are the biggest factor on reveg speed. If you flip to flower and back just to see sex, 2-4 weeks if they're not super young, longer if they are. The longer it takes to show sex the longer to revert.

You can just take a couple clones of each and then flip. Toss the male clones if you don't want them. Or wait for hairs to show eventually like was said