as king says you can flip to flower at any stage of growth, you can even go 12-12 from seed and get yields of 14g and anything around 28g per plant, plants will also show sex under veg depending on the light schedule your using, i find under 24-0 plants take much longer to show sex in veg, plants under 18-6 tend to show sex much sooner and under glr they show sex within 4 to 6 weeks, so it depends on light schedule and strain,
so you dont need to wait until they show sex before flipping to 12-12, if they was showing sex under veg then this means they will start to flower a bit sooner under 12-12 compared with a plant thats not mature, so when you think the plant is big enough to go into flower then just flip it 12-12, i usually go on height then flip when my plants are roughly the height i want to flower them at knowing that they will finish around twice as big
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