Autoflower Cannabis Seeds
Autoflower seeds go from seed to harvest in just 8–11 weeks without any light schedule changes. Modern autoflowers from Fast Buds, Dutch Passion, and Royal Queen Seeds now hit 24–28% THC and rival photoperiod yields.
1342 strains found
Tropical Butter Sauce Automatic Seeds
$28.67
Caramellow Kush Automatic Seeds
$18.23
Mandarin Punch Automatic Seeds
$22.84
Stardust Kush Automatic Seeds
$28.67
Berliner Automatic Seeds
$37.91
Sensi Supreme Jack Automatic Seeds
$28.67
White Skunk Automatic Seeds
$28.67
Sensi Skunk Automatic Seeds
$28.67
Gelauto Kush Automatic Seeds
$50.54
StrawZ Automatic Seeds
$28.67
CBD Apple Betty Auto Seeds
$37.94
Blue Bullet Automatic Seeds
$23.33
Pure Power Plant Automatic Seeds
$27.33
Auto GG#4 Original Glue F1 Seeds
$41.72
Early Skunk Automatic Seeds
$24.30
Sensi Amnesia Automatic Seeds
$28.67
White Haze Automatic Seeds
$28.67
Headband Kiwi Automatic Seeds
$63.67
Royal Cheese Auto Seeds
$19.44
Sweet Skunk Auto Seeds
$22.36
Bruce Banner Autoflower Seeds
$37.94
Tropicana Cookies Auto Seeds
$37.91
Sensi Supreme Oak Automatic Seeds
$28.67
Fast Eddy Automatic CBD Seeds
$26.24
Why Choose Autoflower Cannabis Seeds?
Autoflower cannabis seeds flower automatically based on age — typically starting to bud at 3–5 weeks regardless of the light schedule. That means a complete grow from seed to harvest in 60–90 days, no light schedule changes, and no stress about photoperiod timing. Autoflowers are the fastest path from seed to smoke and the easiest seeds to grow outdoors in unstable climates, which is why they have become the fastest-growing seed type on Seennabis. Below you'll find every autoflower strain stocked across 33 verified seed banks — sortable by THC, yield, flowering speed, and grower reviews.
How autoflowers work
Modern autoflowers descend from Cannabis ruderalis, a wild subspecies adapted to short summers in northern latitudes. Ruderalis flowers based on age, not light cycle. Breeders crossed it with high-potency indica and sativa lines to produce the modern autoflower: a plant that flowers automatically at 3–5 weeks while still hitting 18–28% THC and yielding meaningfully. Run autoflowers on 18/6 or 20/4 light from seed to harvest — no schedule change needed. The plant will trigger flowering on its own and finish in 60–90 days total.
Why growers pick autoflowers
Speed is the headline: photoperiod feminized plants take 4–6 months from seed to harvest, autoflowers finish in 8–12 weeks. Outdoor stealth is the other big driver — autoflowers stay shorter (typically 60–110cm) and finish before late-season weather, mold, or law-enforcement leaf-watching becomes an issue. Northern climate growers can run two or even three back-to-back autoflower harvests in a single outdoor season. Indoor growers running multiple staggered tents can harvest every 30 days. The trade-off: per-plant yields are lower (50–200g indoors), and there's no veg window for training.
Best autoflower strains in 2026
The strongest modern autoflowers come from Fast Buds, Royal Queen Seeds, Dutch Passion, and Barney's Farm — breeders that have spent years stabilizing high-THC autoflowering lines. Top sellers right now include Gorilla Cookies Auto, Banana Guava Auto, Mandarin Thuggee, Mendo Frost Auto, and Northern Lights Auto. Newer 'auto-fast' lines (auto crosses with photoperiod fast-flower phenos) have pushed THC into the 25–28% range with only modest yield trade-offs. Filter by `flowerSpeed=fast` to see varieties finishing in 60–70 days.
Training autoflowers (carefully)
Because autoflowers don't have a veg window, aggressive high-stress training (HST, topping, main-lining) is risky — the plant doesn't have time to recover before flowering kicks in and locks the structure. Stick to Low Stress Training (LST) and gentle defoliation. Tie main branches outward early (week 2–3) and let the plant fill the canopy. Pair with a 5–7 gallon fabric pot, light feed schedule (autoflowers are nutrient-sensitive), and stable lighting from day one. With LST alone, a quality auto can hit 150–250g per plant.
Frequently Asked Questions
Do autoflowers need 12/12 light to flower?
No — autoflowers flower based on age, not light cycle. Run them on 18/6 or 20/4 from seed to harvest. They'll start budding at 3–5 weeks automatically.
How long do autoflowers take from seed to harvest?
Typically 60–90 days total. Fast-flowering autos finish in 60–70 days; longer-flowering varieties can take up to 100 days. Always go by trichome color, not the breeder's stated timeline.
Are autoflowers as potent as photoperiod strains?
Modern autoflowers reach 20–28% THC, comparable to mid-tier photoperiod strains. Top-tier photoperiod strains still hit 30%+ THC, but the gap has closed dramatically since 2020.
Can I top or train an autoflower?
Stick to Low Stress Training (LST) and light defoliation. Topping is risky because the plant won't have time to recover before flowering. If you do top, do it before week 3.
What's the best autoflower strain for beginners?
Northern Lights Auto, Blueberry Auto, and Quick One are forgiving, pest-resistant, and finish in 65–75 days. Easy to grow and very hard to kill.
All Autoflower Cannabis Seeds
Browse every autoflower cannabis seed listed on Seennabis. Autoflowers flower automatically based on age rather than light schedule, making them ideal for beginners and growers who want fast harvests in 8 to 11 weeks from seed. Compare autoflower genetics across all verified breeders by THC, yield, flowering window, and grow difficulty.
This Spring on Seennabis
Time-sensitive picks for what growers are actually planting and harvesting this season — refreshed each quarter as the calendar shifts.
Browse by flavor profile
Cannabis terpenes group into a handful of recognizable families. Pick the profile that matches what you actually want to taste — the strain shortlists below come from grower-confirmed flavor tags.