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. 
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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.
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