can you tell the sex of a plant before you flower it

you could put it into 12/12 then when you see the hairs thow it back into veg
some beleave that this will cause it to herm,, ithas never happen to me and thats the way i do it

or you could take a clone from each and label them then put in 12/12 this is the perfered way
 
70391d1028682501-hempseeds-sexing-preflowers-m_and_f.gif

This is a picture of a node, sorry its so big. but it allso shows male/female.
 
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