Quote Originally Posted by oldmac
I think this myth got started by someone not understanding the use of 36-48 hours of a dark period between vegative and flowering. This btw does have an effect on how fast a plant makes that transition.

Hope this helps and is maybe some food for thought. :thumbsup:
OM
More food for thought is that this dark period before flowering is strain dependent.


I've alway's used 36 hours of dark before shifting from 18/6 to 12/12,

While I don't have a full grasp on it's effect, I can say at least for my blueberry strain it was a detriment.

I did a blind grow resulting in high stretch, and 2 day's delay in the onset of flowering in the "Dark cycle" girl

The 2nd plant was simply swapped to 12/12, and actually received an EXTENDED light cycle! around 24-28 hours, most was under the blue of the MH (14-16 hours), the latter was under the red of HPS.


I'm not going to actually log this grow, so it's just speculation See sig line.
canniwhatsis Reviewed by canniwhatsis on . 10/14 I was looking at the photo-period graph in Marijuana Botany, and according to the graph, maximum THC production occurs with about 10 hours of day light. Doesn't that seem logical that when you are flowering, you should reduce the light period to 10 hours during the last 3-4 weeks for maximum effect? :D Rating: 5