Autoflower Seeds

What are autoflowering seeds?

Autoflowering cannabis carries genetics from Cannabis ruderalis, a hardy subspecies that switches to flowering based on age rather than day length. Crossed with popular strains, the result is a plant that goes from seed to harvest in around 9–12 weeks, without changing the light schedule and without needing darkness to trigger bloom.

That makes autoflower seeds perfect for beginners, for growers short on time and for anyone who wants several harvests a year. Outdoors, you can plant them from spring to late summer and still harvest before the cold arrives. Read more in our guide to autoflowering cannabis.

Advantages of autoflower seeds

• Speed: most of our autos are ready 8–10 weeks from germination. Biodiesel Auto completes its life cycle in 60–70 days.
• Compact and discreet: many autos stay under one metre, like Northern Lights Auto (under 110 cm) or Critical Kush Auto.
• Easy to grow: no light-cycle changes, no timing headaches. Just give them light and let them run.
• Several harvests a year: indoors you can run crop after crop; outdoors, two or even three sowings per season.
• Resilient: ruderalis genetics make autos tough and forgiving of beginner mistakes.

Best-selling autoflower strains

• Critical 2.0 Auto: one of the most grown autos around, indica-dominant and discreet at 130 cm.
• Northern Lights Auto: the legendary indica, harvested 9 weeks from germination.
• Gorilla Glue Auto: fat, sticky buds and up to 25% THC in just 70–75 days.
• Big Bud Auto: big, relaxing harvests in about 65 days.
• Runtz Muffin XL Auto: one of our most potent autos, with THC reaching 25% in some plants.
• Blueberry Auto: sweet berry flavour and dense, resinous buds in 65 days.

Want the heaviest yielders? Don’t miss our list of the 10 most productive autoflowering strains.

Cheap autoflower seeds, serious quality

Our autoflowering seeds come from experienced breeders and stable, tested lines produced in large volumes: top seed bank quality at prices from €1 per seed. Quality stays first: seeds are stored in cool, dry conditions and every order is covered by our germination guarantee. For even more savings, browse our cheap cannabis seeds, or check out CBD autoflower seeds if you prefer a milder effect.

Autoflower seeds FAQ

How long do autoflowering seeds take to grow?

Most autoflowers are ready 8–12 weeks after germination, depending on the strain and conditions. Each product page shows the expected cycle.

What is the downside of autoflowers?

Because they flower on a fixed schedule, you cannot extend the vegetative stage to grow bigger plants, and mistakes early on have less time to recover. They are also less suitable for cloning. For most growers, their speed and simplicity more than make up for it.

Are autoflowers good for growing in the UK?

Yes. Their short cycle suits the UK’s short summers: sow outdoors between late spring and mid-summer and harvest before the autumn rain.

Autoflower or feminised: which is better?

Autoflowers are faster and easier; photoperiod feminised seeds give you more control and usually bigger yields. Many growers keep both on hand.