By inspecting the preflower with a magnifier. 90% of strains will show sex by week 3 from seed germination. The rest before week 4. An eyelupe works best for me.
Start looking around the 6th node or above. There are 4 possible locations per node for the preflower, but in early veg(3 weeks and earlier) you'll only see one or two on the entire plant. There are four stipules (look like small thin pointy grass blade) at each node. The preflower is located behind the stiplule, in front of the new growth branch. It will emerge as a bump and develop fast (like overnight), generally the male emerges rounded and the female more pointy at the end. The early give away besides the round/pointy tip is the male will show a separation between the stem and the emerging preflower as in a stem from a stem with a ball on top, the female shows no discernable separtion and appears continuous from stem up the preflower, usually fatter at the bottom and gradually leading to a pointed tip. Easy, male roundness, female pointyness. Until you know what you are doing, just move the "males" to the outside of the grow and "females" to center or prime light, until you are certain of ID. Really hard to do early without a magnifier! Easy to do once you know how!
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