Unlike traditional photoperiod cannabis strains that depend on seasonal daylight changes to flower, autoflowering seeds transition from growth to bloom automatically based on age. In this guide, we break down how autoflower genetics work, their lifecycle, and why they have revolutionized modern home growing.

If you're new to cannabis cultivation, you’ve likely come across the term "autoflowering" but what actually makes these seeds different from traditional options? Simply put, autoflowering plants bloom based on age rather than changes in daylight hours. While standard photoperiod strains need a strict shift to 12 hours of uninterrupted darkness to trigger flowering, autos simply follow their own internal clock.

What’s the difference between Autoflowering and Feminized seeds?

Ordinarily, cannabis plants grown from regular or feminized seeds produce flowers during a shorter photoperiod. This is when indoor growers change the light cycle to 12 hours of light and 12 hours of darkness. When growing outside, plants will only start blooming when the number of hours of light a day decreases. This leads to a much longer growing period from seed to harvest.

Autoflowering cannabis plants will enter the flowering phase based on maturity, rather than the light cycle. They are very appropriate for the outdoor growing season, and because of the short flowering stage, you can have multiple harvests during one season. Our Autoflowering marijuana seeds are all feminized, so it means they do not produce any male plants. 

What types of Autoflowering Cannabis seeds are available?

Autoflower cannabis seeds can come in both Indica and Sativa hybrids. Many of your favourite strains are available as autoflowering seeds.

How are Autoflowering Cannabis seeds made?

Autoflowering cannabis seeds are made by cross-breeding regular Indica or Sativa with the Cannabis Ruderalis species.

All our auto-flower seeds are feminized, so that's one advantage you already have. 

The Science: What is Cannabis Ruderalis?

The magic behind autoflowering seeds comes from Cannabis ruderalis, a wild subtype native to northern regions like Siberia. Adapting to short summers with nearly continuous daylight, ruderalis evolved to flower automatically regardless of light levels. Modern breeders hybridize these wild genetics with potent Indica and Sativa strains, giving growers the best of both worlds: high potency, delicious terpene profiles, and an ultra-fast lifecycle.

Autoflowering cannabis seeds are also perfect for impatient and novice growers as you can harvest mostly within 8 to 9 weeks from germination when grown indoors and about 10 weeks when gown outdoors. 

Autoflower vs. Photoperiod: Key Differences

• Speed: Autos complete their full life cycle in 8–11 weeks, whereas photoperiods can take 12–16 weeks or more.

• Size: Auto plants remain compact and manageable (typically 60–120 cm), making them ideal for stealth grows and smaller spaces.

• Light Schedule: You can keep your autos on a consistent 18/6 or 20/4 light schedule from start to finish without needing separate veg and bloom tents.

 

Advantages of autoflower seeds:

• The plants remain reasonably small (on average 40 till 80 cm).
• Autoflowering plants bloom automatically after about 2 to 3 weeks of growing.
• Autoflower marijuana seeds are ready relatively fast (on average 10 weeks from seed till harvest).
• Autoflower cannabis plants remain small and don't attract much attention.
• The smell of autoflowering cannabis plants is relatively less strong than the smell of normal cannabis plants.
• You can harvest more than once during one season.
• For growing Autoflowering plants you don't need much space. 
• Autoflower seeds are easy to grow. 

Understanding how autoflowering genetics work is the first step toward a successful harvest, but getting great results ultimately comes down to starting with stable, high-quality genetics. Whether you are looking for high-THC strains, fruity terpene profiles, or compact plants for a stealthy balcony setup, you can browse our full autoflower seed catalog to find the ideal match for your growing environment.