[Hygro]

How big must a plant be before you can switch the light cycle to 12/12 to determine sex. I want to it as early as possible to get out the males. 6 hydro ebb and flow and 13 soil. Scrog for the hydro. But started seeds in rockwool which was stupid financially. So would like to sex em early to get out males before they root like crazy in the rockwool.

[reckon]

you can go straight from seed running 12/12,...they usually start to show sex after about 30-40 days,...with the males showing balls first.

males will usually be slightly taller than the exact same varieties female (apical dominance)

you can also check the second internode right at the main branch, very often a plant will pop two flowers on each side there after only a few weeks, giving you an early glimpse as to what sex they are.

[Hygro]

So would they still be seedlings when they show sex or will they be more mature with a level or two of nodes?

[Biatchzxz]

Well when they get mature they will tell you. It depends. Just think about it like a baby growing up. Showing it's first teeth etc. Growing into a teenager. No it will show it's sex as soon as it matures naturally. Mother nature. So pretty much u can grow it out 12/12 from seedling. ThAt way it will show sex as soon as it's ready. U could even just give it 18/6 for a week or 2 so it grows a little faster and matures. Or go 12/12 straight Thru. Pull the males , clone females. Etc. The possibilitys are endless. Don't ask me why I compared babys. Teeth and all that sillyness. That sour diesel bowl hit didn't do it . Peace guys and gals

[Stevius]

A good way to determine sex is by taking test cuts and putting them on 12/12.

[kmk420kali]

Originally Posted by Stevius

A good way to determine sex is by taking test cuts and putting them on 12/12.

This is what you want to do--
If you were doing SOG or a micro grow, then you could go straight 12/12 from seed...but it seems like you would like to finish with a li'l more than a 6 inch plant--
Take a couple clones from them, root them, and by the time you do that, your seedlings should be big enough to flip--

[reckon]

little hard to take a cut from something like this:



but I can already see female flowers at the second and third internodes,...these are all girls

these have been growing under 12/12 from seed for 20 days now.

[kmk420kali]

Good luck bro--

[Biatchzxz]

Yeah I see. Well that's good that u already see female flowers. I've already read an article that said just what the dude just said. U can let em grow clone (when u can) n keep 12/12 that way flowers show by the time they root or whateve something Like that I can't think right now for some Sour Diesel resason

[Hygro]

20 days hm. So for hydro what would you do? Go straight to bloom with the nutrients? Then if I wanted to revert them back to veg use veg nutrients? Sounds like alot of stress.