Autoflower Seeds

Autoflowering cannabis seeds are perfect for growers who want speed, simplicity, and stealth. At Homegrown, we offer premium autoflower seeds bred for high THC, quick flowering, and strong resistance to pests and mold. Whether you’re growing indoors, outdoors, or in limited space, our autoflowers go from seed to harvest in as little as 8 weeks — no light cycle changes required. They're ideal for new growers looking to streamline their process and experienced cultivators seeking efficiency without sacrificing quality.

Autoflower seeds produce cannabis plants that begin flowering based on their age — not the amount of light they receive. This trait originates from Cannabis ruderalis, a hardy strain adapted to short growing seasons. Unlike feminized photoperiod strains, autoflowers do not rely on a 12/12 light cycle to bloom, making them ideal for fast grows and discreet setups.

Autoflowering plants are genetically engineered for speed, resilience, and simplicity. Because they flower automatically, they’re especially useful in regions with unpredictable weather or limited sunlight. Plus, with their short stature and fast life cycle, they're perfect for stealth grows on balconies, patios, or small backyard plots.

Our most popular autoflower strains include:

• Blueberry Autoflower – A fruity, relaxing classic with compact size and a beginner-friendly grow profile.
• Gorilla Glue Autoflower – High THC with sticky buds, pungent aroma, and knockout potency that makes it a fan favorite.

Whether you want something energizing and creative or relaxing and sedative, we have a strain tailored to your lifestyle. Explore cultivars with high THC, rich terpene profiles, or even CBD-dominant hybrids for therapeutic effects. Shop the full autoflower seed collection for USA-bred genetics with guaranteed germination.

Indoor Autoflowers:

• Compact size fits small tents or cabinets — great for growers with limited space.
• You can run perpetual harvests by staggering germination times.
• Excellent for maintaining low odor with the right ventilation and filters.
• Maintain 18/6 light schedule throughout the entire life cycle for best results.

Outdoor Autoflowers:

• Ideal for climates with short summers — finish before fall frost.
• Require less space and fewer resources than photoperiod strains.
• Low-profile plants blend in easily for stealth outdoor grows.
• Resistant to pests, diseases, and environmental stress — perfect for beginners.

Pro tip: Start your autoflowers indoors under lights and transplant them outside after two weeks to get a head start.

Germination Steps:

• Soak seeds in water for 12–24 hours until they sink.
• Transfer to moist paper towels between two plates or in a ziplock bag.
• Store in a warm, dark area (70–80°F) and check daily.
• Once a taproot emerges, plant seed root-down in your final container.

Growing Tips:

• Autoflowers enter flower automatically, so timing is critical.
• Use a light, well-aerated soil mix rich in organic matter or coco coir blends.
• Avoid transplanting — root shock can slow growth significantly.
• Begin feeding low-strength nutrients around week 2, increasing bloom nutrients as pistils form.
• Maintain pH between 6.0–6.5 in soil (5.8–6.2 for hydro/coco).
• Harvest when 70–90% of pistils darken or use trichome inspection.

Autoflower seeds are created by crossing a feminized photoperiod strain with a Cannabis ruderalis plant. Ruderalis naturally flowers based on age rather than light. Through repeated backcrossing, breeders stabilize the autoflowering trait while retaining potency, aroma, and other desirable characteristics.

Advanced breeders now produce autoflowers with THC levels comparable to top-shelf photoperiod strains. With proper selection and stress-testing, these strains deliver high yields, dense buds, and stable genetics — all in a compact and fast-flowering package.

• Overwatering in early stages — wait until the top inch of soil is dry.
• Using heavy or hot soils that retain too much moisture or burn seedlings.
• Transplanting after day 10–14 — root shock reduces yield.
• Using high-nitrogen veg nutrients too long — switch to bloom formula by week 4.
• Neglecting pH levels — always monitor runoff and adjust if needed.
• Autoflowers are forgiving, but timing and subtle care make all the difference. Don’t let early mistakes cost you big on final yield.

Autoflower seeds should be stored in an airtight container, placed in a cool, dark, and dry area away from temperature fluctuations. This environment keeps them fresh for longer ensuring their viability. If you plan to store them for longer than six months, it's best to keep them in a refrigerator between 6°C - 8°C.

Use desiccants like silica gel packs to control humidity. Avoid touching seeds directly with hands — use sanitized tweezers when handling. Damaged seeds (cracked, soft, discolored) should be discarded. Label all containers clearly with strain name and date.

To check viability after long-term storage, inspect seed color and firmness, or use a float test: healthy seeds typically sink within an hour of soaking.

Autoflower cannabis plants are smaller and faster, but that doesn’t mean you have to sacrifice quality or harvest size—especially with the right genetics and growing conditions. While autoflowers generally yield less than full-sized photoperiod strains, many growers are surprised by how productive they can be.

Average Yields:

• Indoor: 1–4 oz per plant (28–112g), depending on pot size, light quality, and genetics.
• Outdoor: 2–5 oz per plant (56–140g), especially in rich soil with full sunlight.
• Per square meter (SOG setup): 300–500g/m² with skilled canopy management.

Yield Factors:

• Genetics: Some strains are naturally higher yielding, such as Gorilla Glue Autoflower or Gelato Auto.
• Light Exposure: The more light, the more energy for photosynthesis and bud development.
• Pot Size: Larger pots (3–5 gallons) allow more root growth and therefore better nutrient uptake.
• Environment: Stable temperatures, good airflow, and dialed-in humidity all boost results.

Photoperiod vs. Autoflower:

While photoperiod plants may yield 6–10 oz or more, autoflowers offer faster turnaround—often two or more harvests in the same timeframe. That makes yield per year comparable, especially with staggered or perpetual grow strategies.

High-Yielding Autoflower Examples:

• Gorilla Glue Autoflower: Known for resin-rich buds and solid harvests even in compact setups.
• Amnesia Auto: Offers dense sativa-style buds with yields above average.
• Critical Mass Autoflower: A go-to strain for beginner-friendly, high-output harvests.

Early and Gentle Training Techniques:

Start with low-stress training (LST) by gently bending branches sideways after the third node appears. Use soft ties and avoid harsh manipulation. Defoliation should be limited and only target large fan leaves that block bud sites around week 4. High-stress techniques like topping or mainlining should only be attempted by experienced growers and only on robust strains. Fast-flowering indica-dominant autos tend to handle training better than lanky sativas.

Environmental Controls and Stage-Specific Adjustments:

Keep seedlings warm (72–78°F) with RH around 65%. Drop humidity gradually as plants mature — aim for 55–65% during veg and 40–50% during flowering. Use full-spectrum LED lighting at 18–24 inches above canopy; adjust based on PPFD readings (300–500 for veg, 600–800 for flower). Ensure fans are circulating air gently to prevent mold.

Feeding and Watering by Week:

Week 1–2: Use only pH-balanced water. Week 3: Start ¼ dose of 2-1-2 nutrients. Week 4–5: Increase to ½ strength 10-5-5 veg nutrients. Week 6+: Transition to bloom feed with higher phosphorus and potassium (e.g., 1-2-3 ratio). Always monitor runoff pH and EC.

Lighting Strategy:

Use an 18/6 light schedule for balanced growth and rest. Advanced growers may try 20/4 to push yields, or 24/0 for pure intensity — but some plants show stress under constant light. Adjust distance to avoid bleaching or tacoing.

Advanced Outdoor Techniques:

Create microclimates by planting near heat-retaining structures like stone walls. Use mulch to retain moisture and companion plants (marigolds, garlic, basil) to deter pests. In high-rain zones, elevate containers or use mounded soil beds to prevent waterlogging.

Stress Minimization:

Never transplant late or prune heavily. Avoid major changes to environment, lighting, or feeding during the flowering stage. Autoflowers don’t have time to recover — focus on stability and gradual adjustments.

What does autoflower mean in cannabis?

It means the plant will flower automatically based on time, not light schedule.

Are autoflowers less potent?

Modern autoflowers are bred for high THC and rival photoperiod strains in strength.

How long from seed to harvest?

Most autoflowers finish in 8–10 weeks from sprout.

Can you clone autoflowers?

You can, but it’s not recommended due to their short lifecycle.

Are all autoflowers feminized?

At Homegrown, yes — all autoflowers are feminized for female-only plants.

Do autoflowers need 12/12 light?

No, autoflowers thrive under 18–6 or even 20–4 light schedules from start to finish.

What are the best autoflower seeds for indoor growing?

Compact, fast strains like Blueberry Autoflower or Jack Herer Autoflower excel indoors.

What are 45-day autoflowers?

These are ultra-fast strains bred to finish in under 7 weeks — ideal for stealth or speed growers.