Autoflower cannabis seeds produce plants that switch from vegetative growth to flowering based on age rather than light cycle. Most autoflower varieties begin flowering about 2 to 4 weeks after sprouting and finish roughly 8 to 10 weeks from seed to harvest. You can run them under a constant light schedule, grow them outdoors across a longer window, and skip the light-deprivation routine that photoperiod plants require.
Autoflower Seed Bank Recommendations
What Makes Autoflower Seeds Different?
The autoflowering trait comes from Cannabis ruderalis, a tough subspecies native to regions such as Siberia and Central Asia, where short summers reward plants that reproduce fast. Breeders crossed ruderalis with indica and sativa genetics to keep the automatic flowering trigger while improving potency, aroma, and yield. Modern autoflowers commonly test in the 15 to 25 percent THC range, far above the low-potency landraces of the past.
autoflower seeds for outdoor grow
Light schedule for autoflowers
Run 18 hours on and 6 off, or 20 on and 4 off, from seed to harvest. Some growers use 24 hours of continuous light. There is no 12/12 flip, and light leaks during the dark period do not trigger revegetation.
Size and yield
Autoflowers usually stay compact, often between 60 and 120 cm depending on genetics and container size. A well-grown plant indoors typically returns 1 to 3 ounces of dried flower, while larger high-yield auto strains can reach 4 ounces or more under strong lighting.
autoflower seed bank recommendations
Are Autoflower Seeds Good for Beginners?
Yes. Autoflowers forgive a wider range of mistakes because you do not manage a photoperiod, they fit tents and balconies with limited height, and the short lifecycle means less time for problems to compound. They also let outdoor growers in colder US climates harvest before fall rains and early frost.
The tradeoff is less control. If an autoflower gets stressed or stunted in its first three weeks, it has little time to recover before flowering starts.
How Do You Grow Autoflowers Step by Step?
- Germinate seeds in a damp paper towel or directly in moist soil at around 70 to 80F.
- Plant into the final container, since transplanting shocks autoflowers and stalls growth.
- Keep light at 18/6 or 20/4 and maintain 40 to 60 percent relative humidity during vegetation.
- Feed lightly at first, then increase as the plant enters stretch and early flower.
- Use low-stress training such as bending and tying rather than heavy topping on small plants.
- Harvest when trichomes turn cloudy with some amber, usually 8 to 10 weeks after sprouting.
Can You Clone Autoflower Plants?
You can root a cutting, but the clone inherits the mother's age and will flower on the same schedule while producing far less. Autoflowers are grown from seed for that reason, and most growers run them as single-cycle crops.
Autoflower vs Photoperiod: Which Should You Pick?
- Speed: autoflowers finish in 8 to 10 weeks, photoperiods often need 12 to 16 weeks or more.
- Yield: photoperiods generally produce more per plant when space and time allow.
- Control: photoperiods let you decide when to flower and clone proven mothers.
- Space: autoflowers suit small tents, stealth grows, and short outdoor seasons.
Do Autoflowers Need Different Nutrients?
They use the same nutrient program as photoperiod plants, but on a compressed timeline. Start with a quarter to half strength in weeks 1 to 3, then move to bloom nutrients once pistils appear, and flush in the final week or two.