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The cool thing about growing indoors is the grower can control this aspect. (unless dealing with auto flowers, which flower on their own regardless of light cycle.)

A plant can be put in 12/12 light from the moment it sprouts and will reveal sex within a few weeks, or a grower can grow the cannabis for several months before starting a 12/12 light cycle and not know the sex of the plant(s) the entire time.

This is what is cool about clones too, because once a sex is determined the grower will know what the clones are going to be :)

The clones from last night are all perked up growing towards the light, I'll take photos later :)

Wow. Thanks for providing very detail answer. 🙂

!1UP