The book I'm reading they take some cuttings from plants early on and put them into flower to see the sex. I would think this is something you would do for a big operation maybe, have to have everything labeled really well.
tacman7 Reviewed by tacman7 on . how long to determine sex How long do you veg a plant before detemining sex. If I'm lucky to get a lady then how long until harvest time? Oh, indoor growing. Rating: 5