I am facing the same question....when to start 12/12?

My personal grow is just about at week 7, from seed, and the plants are around 18"-24". I can't see any pre-flowers, although I'm not 100% sure what I'm looking for, and did wonder if I should switch to 12/12 prior to determining sex, or after determining sex?

Reading some other posts, it seems people are switching to 12/12 at around week 7 but, albeit with my limited knowledge and experience, this seems too early to me. Is it?

I was thinking I would need to wait until 9-10 weeks had passed, from seed, to determine sex and, if required, remove the males and THEN switch to 12/12.

Any advice would be greatly appreciated. I'm growing NL, if that helps! :jointsmile:

Thanks again

Peace
Chester Atkins
Nashville