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Top 10 Autoflowering Strains of 2021
After establishing your favourite autoflowering cannabis strains, you've mastered cultivating them over several growing seasons. Do you feel like it's time for something new? If so, check out our best autoflowering cultivars of 2021. These new-school genetics offer huge levels of THC, branch-bending yields, and mouth-watering terpene profiles.
Autoflowering cannabis strains are renowned for their resilience, speed, and overall ease. These traits make them ideal for beginners, experienced growers seeking an easy stash, and those seeking to optimise turnover.
Autoflowering cultivars are predisposed to flower based on age, as opposed to a change in the light cycle. Most varieties surge from seed to harvest in 8–10 weeks and reach a small to medium height that makes them easy to manage and conceal.
Many growers previously associated autos with low-grade weed, and viewed their speed as a trade-off for potency. However, innovative breeders have created a new wave of strains that boast rapid flowering times alongside THC and CBD levels—not to mention flavours—that rival many photoperiod strains.
Check out the best autoflowering strains to cultivate in 2021 below.
ROYAL GORILLA AUTOMATIC
Not long ago, some growers would turn up their noses at those who chose to grow autoflowers. The reason behind this is that early autos simply couldn’t match the yield, potency, and flavour of photoperiodic strains. Today, no one would dare say anything bad about Royal Gorilla Automatic, a dank auto that is more than deserving of the spotlight. This uber-potent lady from the US West Coast is a cross of Royal Gorilla, Royal Cookies, and ruderalis. She has been finely tuned for exceptional performance, beastly potency, and top resin production. Not to mention, she delivers up to 400g/m² of dense bud indoors—all within a short 8–10 weeks from seed.
Royal Gorilla Automatic boasts an impressive 20% THC, so she can deliver a real knockout punch. She starts you out with a happy, heady euphoria that makes way for an incredibly relaxing couch-lock. Smoke (or vape) the girl, and you will taste Diesel flavours with citrus, pine, and fruity notes.
Royal Gorilla Automatic
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Gorilla x Cookies x Ruderalis |
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325 - 400 gr/m2 |
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70 - 100 cm |
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6 - 8 weeks |
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THC: 20% |
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Sativa 30% Indica 50% Ruderalis 20% |
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120 - 170 gr/plant |
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80 - 140 cm |
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10 - 12 weeks after sprouting |
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Heavy, Physically Relaxing, Stoned |
GREEN GELATO AUTOMATIC
Green Gelato Automatic represents the new standard for autoflowering genetics. She packs all of the best traits of a high-quality photoperiod strain into a small and easy-to-grow package accessible to novices and those limited by space.
As the progeny of Green Gelato and Cookies Auto, Green Gelato Automatic descends from a prestigious line of THC titans with tantalising terpene profiles. Her tapered, light-green buds pack a massive THC content of 24%, which synergises with earthy and sweet terpenes to provide an energising and motivating head high.
Indoor plants won’t surpass 120cm in height, but still churn out an impressive 375–450g/m². Plants grown outdoors in containers and raised beds peak at 120cm as well, offering a return of 100–175g/plant. Prepare to harvest her aromatic buds 9–10 weeks after germination.
Green Gelato Automatic
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Green Gelato x Cookies Auto |
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375 - 450 gr/m2 |
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70 - 120 cm |
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7 - 8 weeks |
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THC: 24% |
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Sativa 55% Indica 40% Ruderalis 5% |
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100 - 175 gr/plant |
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100 - 120 cm |
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9 - 10 weeks after sprouting |
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Clear, Physically Relaxing |
SHERBET QUEEN AUTOMATIC
Sherbet Queen Automatic delivers momentous flavours rarely found elsewhere. As the progeny of Pink Panties and Cookies Automatic, she inherited a terpene profile that mostly targets the sweet-detecting taste buds on the tip of the tongue. Along with a THC level of 20% and her indica-dominant genetic profile, these terpenes catalyse a relaxing and enjoyable high perfect for chill evenings.
Sherbet Queen Automatic provides these flavourful flowers in impressive quantities for a strain of her build. Indoor plants reach a height of 100cm and churn out up to 425g/m². If you’re growing outdoors, choose the sunniest spot in your garden and you’ll receive yields of up to 150g/plant. Not bad for a compact strain that tops out at 120cm in this setting.
Sherbet Queen Automatic
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Pink Panties x Cookies Auto |
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325 - 400 gr/m2 |
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70 - 100 cm |
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6 - 7 weeks |
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THC: 20% |
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Sativa 35% Indica 60% Ruderalis 5% |
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100 - 150 gr/plant |
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80 - 120 cm |
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8 - 9 weeks after sprouting |
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Calming |
WHITE WIDOW AUTOMATIC
The White Widow is another classic strain beloved by cannabis smokers and growers all over the world. Royal Queen Seeds took an original White Widow variety and gave the strain an autoflowering update with the help of a fine ruderalis specimen. Out comes the same spectacular White Widow, but now so easy to grow that even bloody novices can handle her! Indoors, she will stay at a convenient height of 40–80cm and produces a very impressive 450g/m² after about 80 days post-germination. Grow her outdoors, and you can expect around 240g/plant in good conditions.
White Widow Automatic is not extremely potent at 14% THC, but she’s still strong enough to make for a very good high. Compared to her photoperiodic sister, her effect is a tad more physical and stoney, making her an excellent smoke for some cool relaxation at the end of the day. She has a pungent aroma and taste defined by woody and earthy notes, yet her smoke is pleasantly smooth.
White Widow Automatic
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White Widow x ruderalis |
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400 - 450 gr/m2 |
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40 - 80 cm |
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7 - 8 weeks |
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THC: 14% |
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Sativa 40% Indica 40% Ruderalis 20% |
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190 - 240 gr/plant |
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50 - 110 cm |
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10 - 12 weeks after sprouting |
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Physically Relaxing, Stoned |
AMNESIA HAZE AUTOMATIC
The original Amnesia is a famous sativa with a cult following. Her euphoric high and unique flavour are the reward for what many would describe as a difficult growing process. Most Hazes need around 12 or more weeks to flower, and their size and nutrient demands can be an issue too. Luckily, Amnesia Haze Automatic by Royal Queen Seeds is here to save the day! This fabulous autoflowering variant does away with the long wait, instead requiring only 80–85 days from germination. Moreover, she will remain at a convenient height of 80–150cm, which makes her very manageable.
Amnesia Haze Automatic provides the same superb heady effect that made her big sister so famous—a high that is as cerebral as it is uplifting. Another highlight is her classic Haze aroma that blends earth and citrus notes to max capacity. As long as you make sure not to overfeed her, growing (and enjoying) Amnesia Haze Automatic will be a breeze.
Amnesia Haze Automatic
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Amnesia x Ruderalis |
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350 - 400 gr/m2 |
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50 - 100 cm |
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7 - 8 weeks |
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THC: 18% |
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Sativa 50% Indica 20% Ruderalis 30% |
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130 - 180 gr/plant |
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100 - 120 cm |
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11 - 12 weeks after sprouting |
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Clear, Uplifting |
FAT BANANA AUTOMATIC
Fat Banana Automatic puts the power of new-school autoflowering genetics on display. Royal Queen Seeds teased out the best traits of Fat Banana and Cookies Auto over several generations and stabilised them in a reliable phenotype.
They settled on a final version of the strain that features small and compact buds bursting with THC. At first glance, these blossoms seem innocent. However, her THC content of 22% swarms the CB1 receptors with only a couple of hits. Within a matter of seconds, her phytochemical cocktail of cannabinoids and earthy terpenes cast a stoning effect over the body and mind.
Indoor plants peak at 100cm and provide a rewarding yield of 375–450g/m² after 9–10 weeks post-germination. Outdoor plants reach a similar height and produce 90–175g/plant.
Fat Banana Automatic
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Fat Banana x Cookies Auto |
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375 - 450 gr/m2 |
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70 - 100 cm |
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7 - 8 weeks |
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THC: 22% |
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Sativa 20% Indica 70% Ruderalis 10% |
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90 - 175 gr/plant |
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80 - 120 cm |
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9 - 10 weeks after sprouting |
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Calming, Clear |
PURPLE QUEEN AUTOMATIC
Purple Queen Automatic puts on a show during the flowering phase. This mellow auto produces thick and glistening buds that boast fantastic shades of purple, dark green, and orange. Bring these flowers to your group smoking sessions to amaze your botanical buddies.
Looks aside, Purple Queen Auto provides an exceptionally chilled-out experience. Her moderate THC level of 16% converges with fruity terpenes to provide a deeply relaxing physical high.
Watch these mesmerising purple buds emerge at the end of a rapid growing cycle of 8–9 weeks. Expect to harvest 350–400g/m² from indoor plants topping out at 90–130cm. Outdoor plants provide 100–150g/plant and perform best in polytunnels and greenhouses.
Purple Queen Automatic
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Purple Queen x Critical Auto |
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350 - 400 gr/m2 |
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90 - 130 cm |
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6 - 7 weeks |
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THC: 16% |
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Sativa 15% Indica 80% Ruderalis 5% |
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100 - 150 gr/plant |
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90 - 140 cm |
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8 - 9 weeks after sprouting |
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Calming, Euphoric |
HULKBERRY AUTOMATIC
The original HulkBerry pushed the boundaries of cannabinoid production and amazed the European cannabis world with her hard-hitting highs. Royal Queen Seeds managed to capture the best elements of this legendary high in an autoflowering strain.
After crossing HulkBerry with Diesel Automatic, the progeny emerged as a sativa-dominant variety boasting long, tapered flowers with a THC level of 21%. Opening a stash jar full of these buds releases a wave of sweet and fruity terpenes into the air, which gives a hint of the flavours to come.
HulkBerry Auto thrives in a mild climate and does particularly well in grow tents and greenhouses, where she reaches a height of 80–120cm. Indoor plants produce 450–500g/m² and respond well to LST. Outdoor plants offer 100–150g/plant and do well when interplanted with companion species such as basil. You can expect to make the chop just 8–9 weeks after your seeds germinate.
HulkBerry Automatic
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Hulkberry x Diesel Auto |
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450 - 500 gr/m2 |
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80 - 120 cm |
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6 - 7 weeks |
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THC: 21% |
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Sativa 65% Indica 30% Ruderalis 5% |
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100 - 150 gr/plant |
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80 - 120 cm |
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8 - 9 weeks after sprouting |
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Clear, Uplifting |
MIMOSA AUTOMATIC
Named after a deliciously refreshing drink, Mimosa Automatic wakes up the mind, turns on the senses, and blasts the CB1 receptors with THC. Her dense and trichome-laden flowers boast a huge THC content of 21%, making her one of our most powerful autos available. Her sativa-dominant genetics mean every inhalation contributes towards an exhilarating high ideal for daytime use or creative projects.
Prepare your stash jars for a rewarding yield of 350–400g/m² when growing this strain indoors. If you grow her outdoors, plant her alongside companion species such as lavender for extra pest protection. Expect a yield of 90–130g/plant ready to harvest only 10 weeks after germination.
Mimosa Automatic
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Mimosa Auto x Orangeade Auto |
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350 - 400 gr/m2 |
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100 - 150 cm |
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7 - 8 weeks |
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THC: 21% |
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Sativa 65% Indica 30% Ruderalis 5% |
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80 - 130 gr/plant |
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120 – 160 cm |
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9 - 10 weeks after sprouting |
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Clear, Uplifting |
DO-SI-DOS AUTOMATIC
Do-Si-Dos Automatic brings the delicious and stoning traits of the original strain into the autoflowering world. She produces tall and dense flowers slathered with THC and terpene-rich resin. This indica-dominant lady will sweep you off your feet and put you in the mood for a good film and some delicious food. Prepare to chill.
Do-Si-Dos Automatic also brings impressive yields to the table for such a compact auto. Indoor plants put out 350–400g/m² in as little as 9 weeks after seeds meet the soil. Plants grown outdoors in the elements produce 100–150g/plant after basking in the sunlight.
Do-Si-Dos Automatic
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Do-Si-Dos x Cookies Auto |
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350 - 400 gr/m2 |
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80 - 120 cm |
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7 - 8 weeks |
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THC: 20% |
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Sativa 35% Indica 60% Ruderalis 5% |
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100 - 150 gr/plant |
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100 - 140 cm |
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9 - 10 weeks after sprouting |
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Calming |
Have you found a favourite that you want to grow from our list of top autoflowers? For even more choices, check out all the cannabis strains in the Royal Queen Seeds catalogue! RQS offers not just top autoflowers, but also feminized cannabis seeds and CBD-rich medicinal cannabis seeds.
Happy growing!
