question

how old will the plant be when you find out the sex of it ?

Well that depends. It all starts when switch to 12/12 lighting. Some show sex in a couple days some 2 weeks my hit at day 10 I got the white hairs. Also you should veg at least a month so if you do that it can take 5 to 7 weeks to show sex unless you veg longer then you can figure that out it starts when you swith your light to 12/12

about 4-5 days into flowering

nicfitnikki87 said:

how old will the plant be when you find out the sex of it ?

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Also, if you veg for long periods of time, your plant will start to show sex.

but you will still have to 12/12 to flower.

I think the last of my plants had shown sex 5 weeks from seed.

I've had some show within three weeks from seed under 18/6 and others will take a couple weeks after the change to 12/12 to show. It is purely genetic.