Photos are the way to go but that's me I don't like feminized or autos. But if your looking as to when preflowers might show it's more of a crap shoot. If on a 18/6 light schedule you could see preflowers in six weeks or so just remember though it's all genetics and strain as well. For creating them as said already you can spray them with silver. I would rather clone then make feminized seeds.I never grew anything besides female seeds. When will they approx show pre flowers? Will the male or female show first? Also does anyone know how to create female seeds?