Top 5 indoor autoflower cannabis seeds in 2025

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 flavours. 

Best autoflower cannabis strains to grow indoors

Quality levels from this top 5 selection rival the best photoperiod feminised seed varieties. These customer favourites are best sellers for the wide grow latitude, fuss-free cultivation and slamming 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 kicking back after a tough day. The flavours combine fruity sourness, creamy sweetness and a chemical diesel/gassy edge. 

She is a favourite for extractions due to the unusually dense layer of frosty trichomes and loud US-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 xBlue Auto Mazar), this strain excels indoors with compact, bonsai-like plants yielding medium-high harvests in 10-11 weeks. 

THC levels in the range 20-25% provide a powerful, relaxing high with a firm 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 is 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 unwinds into relaxation. Tangy citrus, sour fruit, and subtle blueberry-yogurt flavors shine through, with a sweet profile that's vape-friendly. 

Sturdy and potent, it's a stress-buster for indoor environments, blending sativa vigour 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 potent 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) forms 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 errors while delivering consistent potency.

SSSC bonus pick: Auto Northern Dragon Fuel

From the Super Sativa Seed Club (SSSC), Auto Northern Dragon Fuel is an indica-dominant (Afghani landrace x Northern Lights x SSSC auto) which grows vigorously indoors to produce 1-1.5m (3 - 4.5ft) Xmas-tree structures. 

Yields are up to 500g/m² (1.6 oz/ft²) in 10-11 weeks. High THC (>20%) provides an uplifting and intense stone. A classical pungent Afghani aroma evokes old-school hash memories with earthy, penetrating notes. 

Resilient and productive in growth, it's a relaxing classic for stress relief.

Tips for growing autoflower seeds indoors

Germination and planting: Germinate in damp (never soaked) cotton pads or directly in final pots (15L + are typical). Germinating in your final plant container avoids the potential hazard of transplant shock later on. Aim for grow room temperatures around 23-25°C / 73-77F. 

Light schedule: Use 18/6 or 20/4 LED cycles from autoflowering marijuana seed to harvest for optimal growth. Some prefer 24/0 light cycles. Whichever autoflower light cycle you use, ensure you meet the challenge of keeping your autos in the optical sweet spot. Use/borrow a light meter if necessary and refer to LED manufacturers guidelines for hanging height/intensity at different stages of growth.

Environment: Keep temperatures around 23-25°C / 73-77F during lights-on and a degree or two cooler during lights-off. Relative humidity should be reduced to 40-50% in bloom to minimise risk of mould/bud rot. Buy the best autoflower seeds and you will be rewarded with heavy, thick blooms if you can keep your plants in the nutrient and optical sweet spot from marijuana seed to harvest.

Nutrients and water: Use of slow release organic nutrients (BioTabs are market leaders and highly recommended) allows you to keep your autos in the nutrient sweet spot with greater ease than most growers find by using bottled mineral nutrients. 

Overfeeding & over watering advice. Note that the two most common yield/quality limiting errors (especially from less experienced growers) tends to be over-feeding and over-watering. Use of a tensiometer (measures soil water content via surface tension measurements) is highly recommended for each container. Use of slow-release organic nutrients allows you to grow with the ‘water-only’ grow system for much of the grow. This drastically reduces/eliminates the scope for over-feeding errors.

Training and space: LST or the SCROG method can be used to great effect for the large, higher stretching & yielding strains. 

Harvest: Check trichomes at 10-12 weeks, this article explains the best ways to harvest indoor cannabis with colour pictures of trichomes at harvest; expect 400-600g/m² (1.3 - 2 oz/ft²) with these strains under well-managed LED light. 

Related:
10 tips for bigger & better indoor autoflower harvests

Final thoughts: pro quality harvests with autoflower seeds

Work hard to optimise your indoor grow room, invest in good equipment, lights, grow containers, grow medium, tools & meters etc. 

The top growers work hard over many years to master their craft. But even they can’t grow the best buds with screaming terpenes and 25% THC levels from poor quality weed seeds. Invest in the best autoflower genetics you can get and learn as much as you can from other growers. 

This 1.4Kg Auto Critical Orange Punch dry harvest (you read it 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 some top-quality seeds at discounted prices, up to half price! Good luck with your next auto grow and remember that autos also grow very well outdoors or in greenhouses/polytunnels typically taking 3 months to reach harvest. 

Check out our Top-10 tips for growing autoflower seeds outdoors if you plan some outdoor action in the summer.