Autoflower cannabis seeds grow well indoors, outdoors, or in greenhouses. Indoors, they are typically ready to harvest around 10–11 weeks after germination, often grown under 18–20 hours of daily light. Dutch Passion’s autoflower seed varieties stand out for their numerous cannabis cup wins, high THC levels (20–25%, occasionally higher), XL yields, resilient growth, and premium flavors.
Best autoflower cannabis strains to grow indoors
Quality levels from this top 5 selection rival the best photoperiod feminized seed varieties. These customer favorites are best-sellers for their wide grow adaptability, low-maintenance cultivation, and hard-hitting effects.
Auto Frozen Biscotti: pungent USA cookie goodness
This indica-dominant hybrid (Auto Oreoz OG x Biscotti) is a compact Cookies powerhouse perfect for indoor setups, producing XL yields of dense, resin-covered buds in about 11 weeks.
With THC around and above 20%, Auto Frozen Biscotti delivers a balanced, soothing body buzz paired with uplifting effects. She is ideal for relaxation and unwinding after a tough day. The flavors combine fruity sourness, creamy sweetness, and a chemical diesel/gassy edge.
She’s a favorite for extractions thanks to the unusually dense layer of frosty trichomes and loud U.S.-style aromas. The easy, natural growth suits beginners. These plants thrive in small spaces without requiring advanced plant training experience.
Auto Strawberry Soda: forgiving, high-performance auto
Auto Strawberry Soda is an indica-dominant cross (the legendary Strawberry Cough x Blue Auto Mazar). This strain excels indoors with compact, bonsai-like plants yielding medium-high harvests in 10–11 weeks.
THC levels in the range of 20–25% provide a powerful, relaxing high with a strong euphoric vibe. Expect sweet strawberry, red berry, and fizzy soda terpenes for a delightful smoke, enhanced by vibrant purple hues in cooler conditions. Its resilience and SOG compatibility make it forgiving for indoor growers aiming for quick, aromatic results.
Auto Red Tropicana Cookies: serious potency, fast growth
Auto Red Tropicana Cookies, a sativa-dominant hybrid (Red Tropicana Cookies x Auto Night Queen), offers exceptional indoor bag appeal with purple tones and compact, dense buds ready in 11 weeks.
THC can approach 25%, delivering a creative, energetic high that eases into relaxation. Tangy citrus, sour fruit, and subtle blueberry-yogurt flavors shine through, with a sweet, vape-friendly profile.
Sturdy and potent, it’s a stress-buster for indoor environments, blending sativa vigor with auto speed.
Auto Melonade Runtz: fruity & creamy with unique terps
Auto Melonade Runtz is a fine-quality hybrid (Auto Pink Runtz x Melonade). This strain grows to average size indoors, producing high yields of dense, frosty buds in 11 weeks.
With up to 25% THC, she packs a potent, long-lasting high perfect for connoisseurs. Fruity, creamy melon and Runtz terpenes dominate, highlighted by unique farnesene notes.
Easy to cultivate with sturdy branches, it’s stable for SOG and natural grows, rewarding the grower with white, resinous buds and powerful, long-lasting effects.
Auto Cinderella Jack: THC heavyweight, easy to grow
Auto Cinderella Jack is a sativa-leaning hybrid (Cinderella 99 x Jack Herer x autoflower genetics) forming medium-sized, Christmas tree-shaped plants indoors, yielding XL resinous buds in 10–11 weeks.
THC levels exceed 25%, offering a potent, giggly, happy high with calming effects. Sweet, fruity, and herbal flavors provide a balanced smoke. Forgiving and vigorous, it’s ideal for indoor LED grows, handling minor mistakes while delivering consistent potency.
Tips for growing autoflower seeds indoors
Germination and planting: Germinate in damp (never soaked) cotton pads or directly in final pots (15L+ is typical). Germinating in your final container avoids the potential risk of transplant shock later on. Aim for grow room temperatures around 73–77°F.
Light schedule: Use 18/6 or 20/4 LED cycles from autoflower seed to harvest for optimal growth. Some prefer 24/0 light cycles. Whichever autoflower light schedule you use, ensure your autos stay in the optical sweet spot. Use or borrow a light meter if needed and refer to LED manufacturer guidelines for hanging height and intensity.
Environment: Keep temperatures around 73–77°F (23–25°C) during lights-on and a degree or two cooler during lights-off. Relative humidity should be reduced to 40–50% in bloom to minimize risk of mold or bud rot. Buy the best autoflower seeds and you’ll be rewarded with heavy, thick blooms if you maintain the nutrient and optical sweet spot from seed to harvest.
Nutrients and water: Using slow-release organic nutrients (BioTabs are market leaders and highly recommended) allows you to keep your autos in the nutrient sweet spot more easily than most growers can with bottled mineral nutrients.
Overfeeding & overwatering advice: The two most common yield- and quality-limiting mistakes (especially among newer growers) are overfeeding and overwatering. Use of a tensiometer (which measures soil water content via surface tension) is highly recommended for each container. Using slow-release organic nutrients allows you to grow with a “water-only” system for much of the grow, drastically reducing or eliminating overfeeding errors.
Training and space: LST or the SCROG method can be used to great effect for the larger, higher-stretching, higher-yielding strains.
Harvest: Check trichomes at 10–12 weeks. This article explains the best ways to harvest indoor cannabis with color pictures of trichomes at harvest. Expect 400–600g/m² (1.3–2 oz/ft²) with these strains under well-managed LED lights.
Final thoughts: pro-quality harvests with autoflower seeds
Work hard to optimize your indoor grow room and invest in good equipment, lights, containers, grow medium, tools, and meters.
The top growers work hard over many years to master their craft. But even they can’t grow the best buds with loud terpenes and 25% THC levels from poor-quality seeds. Invest in the best autoflower genetics you can get and learn as much as you can from other growers.
This 3.3lb (1.4kg) Auto Critical Orange Punch dry harvest (you read that right) shows the true potential of the best autoflower seeds from professional seed banks when pushed to their absolute limit.
Remember, the ongoing Dutch Passion seed sale offers top-quality seeds at discounted prices: up to half off! Good luck with your next auto grow, and remember that autos also grow very well outdoors or in greenhouses/hoop houses, typically taking about 3 months to reach harvest.
Check out our Top 10 tips for growing autoflower seeds outdoors if you’re planning some outdoor action this summer.
