10 Highest THC Autoflower Strains In 2022 (With Pictures)

Looking for the Strongest Autoflower strains to grow? Look no further!

I’ve hunted down the top 10 most potent auto-flowering cannabis strains that are guaranteed to blow your mind.

Free Cannabis Seeds? Check out my list of the best seed bank promotions – Including FREE Seeds, discount codes, and giveaways!

1. Hellfire OG ~ 29% THC

hellfire og autflower
Sativa/Indica10% Sativa
Flowering Time55 to 65 days
Grow DifficultyMedium
Max Indoor Yield400 grams/m²
Max Outdoor Yield150 grams/plant
Plant Height (Outdoors)60 to 80 cm
Plant Height (Indoors)60 to 80 cm
EffectsEuphoric, Happy, Relaxed, Creative, Energetic, Social
Aroma/FlavorsHerbal, Pepper, Pine, Citrus, Diesel, Lemon, Sour

Hellfire OG is a potent and fast-growing Indica-dominant strain that was created by crossing two renowned parent strains, OG Kush and SFV OG Kush. This autoflowering variety inherits the robust plant structure, mouthwatering flavors, and pungent aroma of its parents. It also takes after its Sativa-dominant parent strain in terms of its effects, offering an uplifting and relaxing experience.

Due to the presence of Ruderalis genes, Hellfire OG plants remain short and manageable, with an average height between 80 and 100 cm indoors and outdoors. This makes it suitable for those with limited grow spaces. The flowering period of this strain is about 8-9 weeks, with a harvest expected around October to November.

The yield from Hellfire OG is abundant, despite her modest stature. Indoors, cultivators can expect to get an average of 300-400 grams per m², while outdoor growers can harvest 80-150 grams per plant.

The effects of Hellfire OG are balanced, providing an energetic and uplifting cerebral high that is paired with a relaxing body stone. It also has potent anti-inflammatory properties, making it effective in reducing physical discomforts such as chronic pain, sore joints, and cramps.

2. Bruce Banner ~ 26% THC

bruce banner autoflower
Sativa/Indica50% Sativa
Flowering Time56 to 63 days
Grow DifficultyEasy
Max Indoor Yield600 grams/m²
Max Outdoor Yield150 grams/plant
Plant Height (Outdoors)75 to 150 cm
Plant Height (Indoors)50 to 100 cm
EffectsEnergetic, Euphoric, Relaxed, Creative, Focused, Giggly, Uplifting
Aroma/FlavorsDiesel, Earthy, Sweet, Berry, Citrus, Flowery

Bruce Banner is an award-winning Sativa-dominant hybrid with a whopping average THC level of about 26%. It has been bred from OG Kush and Strawberry Diesel genetics to create a potent, powerful strain that offers both an uplifting mental buzz and a full-body high.

In terms of plant height, Bruce Banner can grow up to 100 cm indoors and is especially suited for the ‘monster plant’ lover. It has a flowering time of 8-9 weeks and yields an abundant harvest, producing up to 600 grams per m² indoors and 150 grams per plant outdoors.

The effects of Bruce Banner are both mentally and physically stimulating. This powerful hybrid will leave you feeling giggly, euphoric and creative while at same time remaining clear-headed and energetic. It is perfect for those days when you need a burst of energy and motivation to get things done!

3. Critical Purple ~ 25% THC

Sativa/Indica20% Sativa
Flowering Time49 to 56 days
Grow DifficultyEasy
Max Indoor Yield400 grams/m²
Max Outdoor Yield200 grams/plant
Plant Height (Outdoors)60 to 120 cm
Plant Height (Indoors)50 to 90 cm
EffectsCalming, Hungry, Lazy, Relaxed, Sleepy, Focused, Tingly
Aroma/FlavorsEarthy, Sweet, Woody, Citrus

Critical Purple is a great option for any cannabis enthusiast looking to get the most out of their crop. This Indica-dominant hybrid strain offers an incredibly high THC content, making it a very potent and long-lasting physical and mental effect. The ease of growth has been significantly increased by adding auto-flowering genetics, making it a great strain for novice growers.

Critical Purple reaches an average height of 120 cm outdoors and around one meter indoors. The flowering time is relatively short at 7 to 8 weeks, with harvest coming towards the end of the cycle. Indoor yields can reach up to 400 grams per m² while outdoor yields average 200 grams per plant.

The effects of Critical Purple are powerfully relaxing and long-lasting. It has been praised for its ability to reduce chronic pain, relieve anxiety and stress, reduce nausea, and even reduce headaches and migraines. In addition to these medicinal benefits, the strain is also great at improving appetite.

4. Acapulco Gold ~ 24% THC

acapulco gold autoflower
Sativa/Indica65% Sativa
Flowering Time56 to 70 days
Grow DifficultyMedium
Max Indoor Yield600 grams/m²
Max Outdoor Yield550 grams/plant
Plant Height (Outdoors)110 to 170 cm
Plant Height (Indoors)100 to 150 cm
EffectsCreative, Energetic, Happy, Social, Uplifting
Aroma/FlavorsCitrus, Earthy, Fruity, Lemon, Sour, Sweet, Pine

Acapulco Gold is an old-school Sativa strain that is renowned for its potency. This classic strain has been crossed with Ruderalis to make it auto-flowering and even easier to grow, with a shorter vegetative period. Acapulco Gold’s unique combination of terpenes leads to its complex aroma and flavor profile, with hints of lemon, pine, earthiness, and toffee.

Grown indoors, Acapulco Gold grows into plants that will reach an average height of 100-150 cm. This strain is surprisingly high yielding given its short flowering period; you can expect about 500 – 550 grams per square meter with optimal conditions. Outdoors, Acapulco Gold can yield up to 450 – 550 grams per plant.

This strain boasts an impressive THC content of 24%, which will give you a powerful cerebral and body high that is both uplifting and relaxing. This combination makes it popular among recreational and medicinal users alike, who benefit from the mood-enhancing properties and analgesic effects.

5. G13 ~ 24% THC

g-13 autoflower
Sativa/Indica20% Sativa
Flowering Time56 to 63 days
Grow DifficultyEasy
Max Indoor Yield550 grams/m²
Max Outdoor Yield100 grams/plant
Plant Height (Outdoors)100 to 120 cm
Plant Height (Indoors)90 to 110
EffectsEuphoric, Relaxed, Sleepy, Powerful, Uplifting
Aroma/FlavorsBerry, Fruity, Herbal, Skunk, Sweet, Woody

G13 is a great hybrid strain for both indoor and outdoor cultivation. This predominantly Indica strain offers a powerful yet mellow high that can be used to help alleviate chronic stress, muscle spasms, and joint pain and even combat sleep disorders.

It is well-known for its short growing time of only 56 to 63 days before G-13 delivers high-quality buds, and her small size, which reaches no more than 120 cm, makes her an ideal choice for growers in tight spaces.

With indoor yields of up to 550 grams per m² and outdoor yields of up to 100 grams per plant, G13 packs a lot of punch in her petite frame. Its pungent earthy, herbaceous and citrus aromas offer users a tantalizing flavour experience with each smoke.

The effects of G13 can range from a slightly euphoric yet completely mellow high to an analgesic property that helps to effectively relieve pain. For those with sleep disorders, a higher dose may be necessary in order to achieve the desired results. As with any other potent strain, users should exercise caution and moderate their dosage accordingly in order to avoid any adverse effects.

6. Bubble Gum ~ 23% THC

bubble gum
Sativa/Indica40% Sativa
Flowering Time56 to 63 days
Grow DifficultyEasy
Max Indoor Yield350 grams/m²
Max Outdoor Yield150 grams/plant
Plant Height (Outdoors)100 to 130 cm
Plant Height (Indoors)70 to 90 cm
EffectsCreative, Euphoric, Powerful
Aroma/FlavorsBerry, Earthy, Sweet, Tropical

Bubblegum is a great choice for both experienced and novice growers who are looking for an easy-to-grow yet rewarding cannabis variety. The strain’s short flowering period of only 56-63 days allows indoor growers to maximize their harvest with the Sea of Green or SCROG methods, while outdoor growers can enjoy two harvests in just one season. The plant itself remains short and manageable, growing only up to 70-90 cm indoors and 130 cm outdoors, making it the perfect strain for limited spaces.

In terms of yield, indoor growers can expect yields of 300-350 grams/m², while outdoor growers may expect yields of around 130-150 grams per plant.

Bubblegum boasts a sweet, sugary taste and aroma of floral notes that have earned it its namesake. Its effects are mainly Sativa-driven, providing an uplifting, euphoric head high that is great for creative endeavors. Indica characteristics offer medical benefits such as alleviating chronic stress, body tension, menstrual cramps, and pain.

The only potential side effects of Bubblegum are dry eyes and dry mouth, both of which can easily be remedied with hydration.

7. Amnesia Kush ~ 22% THC

amnesia kush autoflower
Sativa/Indica60% Sativa
Flowering Time49 to 56 days
Grow DifficultyMedium
Max Indoor Yield500 grams/m²
Max Outdoor Yield300 grams/plant
Plant Height (Outdoors)100 to 120 cm
Plant Height (Indoors)50 to 100 cm
EffectsCalming, Creative, Energetic, Euphoric, Focused, Relaxed
Aroma/FlavorsCitrus, Lemon, Sweet, Pine

Amnesia Kush is an indica-dominant autoflowering cannabis strain from Dinafem Seeds. It is a cross between two legendary strains, Amnesia Haze and OG Kush, with the addition of ruderalis genetics to give it an accelerated flowering cycle. This Sativa-leaning strain provides users with an uplifting and long-lasting cerebral buzz.

In indoor gardens, Amnesia Kush typically grows from 50 to 100 cm in height. Outdoors, it rarely exceeds 120 cm. Being an autoflower strain, Amnesia Kush blooms automatically without the need for a change in light cycle. It takes 8-9 weeks from sprouting to harvest.

Amnesia Kush offers significant yields for indoor growers, with an average of 400-500 g/m2. Outdoor growers can expect a yield of 200-300 g per plant.

With 22% THC content, this strain provides strong psychoactive effects. It begins with a stimulating, uplifting head-high that fades into relaxation throughout the body. While it offers limited analgesic properties due to its low CBD levels, it can reduce stress and anxiety by improving mood.

8. AK-47 ~ 21% THC

ak 47 autoflower
Sativa/Indica35% Sativa
Flowering Time42 to 56 days
Grow DifficultyEasy
Max Indoor Yield500 grams/m²
Max Outdoor Yield90 grams/plant
Plant Height (Outdoors)100 to 150 cm
Plant Height (Indoors)80 to 100 cm
EffectsEnergetic, Happy, Relaxed, Talkative
Aroma/FlavorsPungent, Herbal, Sweet

AK 47 is a powerful hybrid made from Thai Skunk, Mexican, Afghani, and Ruderalis genetics. It produces beautifully large flowers with a thick covering of shiny resin and an incense-like aroma. Thanks to its auto-flowering nature, the plant is easy for beginners to grow indoors or outdoors in hot or cold environments.

Plant height-wise, this medium-sized plant grows to around 80-100 cm indoors and 100-150 cm outdoors. Flowering time is relatively short, only requiring 42 – 56 days when grown indoors. Outdoors, AK 47 will be ready for harvest after 9 to 10 weeks of vegetative growth.

When it comes to yield, the potential is massive. Indoors, you can expect 400-500 g/m² and outdoors, 90 g per plant. The buds are compact and thick and of high quality. Effects-wise, this strain offers an energetic yet relaxing experience that relieves chronic pain and anxiety or makes you feel good in general. Common side effects are dry mouth and eyes, which can be remedied easily.

9. Gelato ~ 21% THC

gelato autoflower
Sativa/Indica40% Sativa
Flowering Time56 to 63 days
Grow DifficultyEasy
Max Indoor Yield500 grams/m²
Max Outdoor Yield100 grams/plant
Plant Height (Outdoors)120 to 160 cm
Plant Height (Indoors)90 to 120 cm
EffectsCreative, Euphoric, Hungry, Relaxed, Calming, Uplifting
Aroma/FlavorsFruity, Kush, Sweet, Woody

Gelato is an excellent choice for both recreational and medicinal use. Its compact size makes it ideal for indoor growth, while its high yield makes it great to cultivate outdoors as well. With a flowering time of 8-10 weeks, you can expect generous yields of between 500 grams per m² indoors and up to 100 grams per plant outdoors.

This strain has a high THC content of 21% and a low CBD content of 0.6%. Its effects are mostly physical and calming, allowing you to stay productive even after consumption. The flavor profile is a delightful combination of sweet berries and orange, which offers an earthy yet sweet cookie aroma on the exhale.

Medical users can benefit from Gelato effects as it helps with headaches, inflammation, chronic pain, and muscle spasms and reduces anxiety and insomnia. However, novice smokers should use this strain with caution as it can be quite potent and lead to paranoia if taken in too high of a dosage.

10. Do-si-Dos ~ 20% THC

Sativa/Indica35% Sativa
Flowering Time49 to 56 days
Grow DifficultyEasy
Max Indoor Yield650 grams/m²
Max Outdoor Yield120 grams/plant
Plant Height (Outdoors)120 to 140 cm
Plant Height (Indoors)100 to 120 cm
EffectsEuphoric, Relaxed, Uplifting
Aroma/FlavorsCitrus, Earthy, Kush, Sweet

Do-Si-Dos is a unique and popular strain that offers an amazing combination of potent yet mellow effects. This Indica-dominant auto-flowering variety was created in 2016 by Pacific Northwest cultivator Archive Seed Bank, crossing two members of OG Kush family – Girl Scout Cookies and Face Off OG with ruderalis.

The flowering time of Do-Si-Dos is incredibly fast, ranging from just 9 to 10 weeks from seed to harvest. Growing indoors, these plants remain at a modest height, between 80 and 120 cm, which makes them extremely discreet. Outdoors, this strain can grow up to 140 cm in length and produce huge buds due to their additional size.

Do-Si-Dos is perfect for those looking for impressive yields, with an indoor yield of 550 to 650 grams per m² and 120 to 140 grams per plant when grown outdoors. This strain also has a high THC content of 20%.

Upon consumption, Do-Si-Dos induces a feeling of euphoria that immediately overtakes your mind and relaxes the body, followed by an uplifting yet calming buzz. It’s perfect for unwinding after a long hectic day and is also excellent for medicinal use, providing relief from chronic pain and anti-inflammatory properties as well as being beneficial for those suffering from anxiety and stress-related mental disorders.

free cannabis seeds

What Are Autoflowering Cannabis Seeds?

Autoflowering cannabis seeds are seeds that have been produced by using the genetics of the cannabis Ruderalis plant.

Ruderlais genetics produce plants that are short-growing, resilient, and automatically start to flower after a certain period of time. Their short vegetation period also means that buds are produced quicker.

These attributes make Autoflower seeds perfect for beginners and people who want an easier grow.

James Alexander James Alexander
Hey, I'm James! The founder and head writer here at GreenBudGuru.com. I started this site to share my passion and knowledge of all things cannabis. I used to work as a budtender in central Amsterdam, and have over 7 years of growing experience.

Find me online:

Leave a Comment

This site uses Akismet to reduce spam. Learn how your comment data is processed.