I’m fairly new to growing my own. Im ready to start experimenting with some advanced training to increase my yield. I figured scrogging is a good place to start. My question is when is the earliest you can identify the sex of your plant so it can be removed from the screen to prevent pollination. 
About 6 weeks (?). I’ve found that males take a bit longer…
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Thanks!
Thank you!! Looking forward to some great grows
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I sex most of mine with a loop around the end of the 4th week. By week 6 I have the clones rooted, by week 8 they are in the flower room. It really depends on strain as well as your eyes and experience. Some strains like northern lights show early.