Originally Posted by MJPassion
Auto flower plants should flower under 24 hours of light.
If you have to have a dark cycle to flower your plant it is not, technically, an auto flower.
Not quite true.
Autoflowering cannabis varieties automatically switch from vegetative growth to the flowering stage with age, starting around day 15-21, showing sex.with photoperiod the ratio of light to dark hours is required to start the process of flowering. Many autoflowers will be ready to harvest in less than 10 weeks from seed, but claims of 60 days seedling to finish is unrealistic. We've tried numerous on the market....82 days are the sweet spot for the majority of autoflowering strains.
THE DILEMMA - WHICH IS BEST, 18 OR 24 HOURS OF LIGHT?
Some like to take the middle ground, using a 20/4 light cycle.
Really, you do not want your autoflowering plants to receive less than 18 hours per day. This is the minimum, and anything less will adversely affect growth.
So, to summarize, every grower should do what best works for them. It is worth experimenting with both light cycles (on two separate grows), to see what gets you better results, and what suits your grow situation better. 24-hour lighting offers a little more potential, but it may not always be practical.
We've done a 1/2 dozen of side-by-side grows between 24/0, 20-4 and 18/6. No appreciable benefit (indoors) 24/0.
To each their own. After growing autos for almost 13 years, we've noted plants grow best under 20/4 or 18/6.