How many hours of light do Autoflowers need in flowering? The use of spare space in a flowering tent is an excellent opportunity for growers to experiment with autoflowering cannabis strains. Autoflowers tend to grow faster and produce larger yields when exposed to 18, 20 or 24 hours of daily light rather than the traditional 12/12 light cycle. Soil can vary in pH, with differents plants thriving in varying levels. Autoflowering strains are similar to photoperiod varieties in that they prefer a slightly acidic soil medium. Growers should try to keep their soil within an optimal pH range of 6.0–6.5. If purchasing soil, make sure the product is suitable in terms of acidity. Keep in mind that suggestion 600 to 900 PPFD during flower is geared towards photo periods, who are only getting 12 hours of light. If you keep your lights on 18 hours for your autos, there’s no need to go near 900. PPFD of 600 at 18 hours on is more than enough to achieve a proper DLI.
The best schedules for autoflowers include: 18/6: With 18 hours of illumination and 6 hours of darkness, you’ll get a good yield without a sky-high electric bill. Some growers believe autoflowers need a short period of darkness to rest. You’ll need to set up a timer.f. 24/0: This schedule is easy – simply leave your grow lights on
Autoflowers don’t need as many nutrients as photoperiod plants because they are compact in size. As long as you take care of the plants by providing at least 12-16 hours of light every day, they will grow well and reward you at the end of it all. Many people assume that autoflowers don’t yield a lot, but think about it. A few hours of extra light will not hurt anything. Remember, you do not need enough light to keep them growing–just enough to make it not dark. To maintain vegetative growth, use 18-24 hours of light; six hours of darkness or less. To promote flowering, alternate 12 hours of light with 12 hours of darkness. Myth #8: autoflowers need 24hs of light; 9. Myth #9: autoflowers cannot be trained; 10. Myth #10: autoflowers take more time than specified; 11. In conclusion; Autoflowers have been developed throughout the years, even though they were less potent and produced less than photoperiods, that has been left behind. Plants in the vegetative phase receiving 18 hours of light should receive between 306 and 617 uMol/second. Plants in the flowering phase receiving 12 hours of light should receive between 460 and 925 uMol/second. If your plants are currently receiving light intensity within the above range, you do not need to adjust the height of your grow light. Autoflowers are meant to flower once they reach a certain size and height, unlike photoperiod plants that flower due to changes in the season. Autoflowering plants will be fine even with 5 hours of light, but many growers misunderstand this. Go ahead with 5 hours only if you’re ready to get small yields.
This is between 10 and 12 hours of darkness — and it must be uninterrupted, meaning no light exposure at all during that time — per night, every night. Therefore, start by checking your local natural daylight hours. If the daylight hours have gone down to 14 hours or less, you are safe to start preparing your plants for the big move.
This is tricky because even the briefest amount of light will make plants start growing again and put off flowering. Therefore, it needs to be a complete, uninterrupted darkness. Marijuana plants are happiest when they get between 5-6 hours of direct sunlight per day.

Over the course of the average autoflowers lifecycle (90 days), an 18/6 lighting schedule is best for your autoflowers can save 180 hours of electricity compared to a 20/4 light cycle. This schedule can also reduce the heat needed to be managed by other equipment in the grow room.

Many plant training methods focus on improving the yield and potency of marijuana. The goal of schwazzing plants is to get more with less. Growers produce an average of 24–32 oz. per 1000 watt bulb in their greenhouse. Using this technique, some report yields of 48 oz. (or 3 lbs.) per light, hence the title of Haupt’s book, Three A Light

But firstly, you need to know that autoflowers will flower under any light cycle. Which means that you can grow them under a 24/0 light cycle or even on a 12/12 light schedule. However, there are other aspects to consider than just if the plants will grow! What is the best light cycle for autoflowers?

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    • how many hours of light do autoflowers need