Not all plants show preflowers in veg. Most don't show sex until 1-3 weeks into 12/12 flowering cycle. A plant is ready for flowering when it's about 12-15 inches tall and has good root development. IMO.

Smell will not help determine sex...unless your're a beagle...
Dutch Pimp Reviewed by Dutch Pimp on . sexing HI All. I have 4 plants on the 5th week of vegetative grouth and they started to pre flower, the problem is i can't tell if they are male or female. Question, i notice some of the plants have a intense scent while the others don't, could this be a sign of male and female? Rating: 5