Simple fast question. How long after flipping lights to 12/12 do the hormones kick in and show flower?
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For me usually 7 to 10 days. And can depend on strain.
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Awesome, thanks 
How long have they been in veg? Are they ready or just wondering?
Flipped mine after 30 days in vege as didnt have the room for big photos and they took 14 days to flower.
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When I flip the flower I count the first 7 days as transition. Usually flower for an additional 9.5 weeks (minimum), so expect 73 days of 12/12s at least. (Tricombs say when to actually harvest).
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7 weeks in veg. They’re getting to big for my space and my autos are flowering
I flipped 55 days from being above ground. That was on 6/1. Today they are showing first pistils.
That puts me out to around labor day.
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Ok. I’m pretty close to you in time then
You can see she is mature enough to start flower
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Mine is as well