10 Strongest Autoflower Strains With Over 30% THC 🤯

An autoflower plant in its flowering stage

Autoflowering cannabis strains are popular because they're quick and easy to grow.

But it's not all about speed; today's autoflowers also boast some pretty impressive potency.

This article looks at 10 of the highest THC autoflower strains that are sure to knock your socks off. 

1. Haze Auto - 24% THC

Haze Auto from WeedSeedsExpress grown by PEAKYPLANTERS and  Mani1728 on Growdiaries

This sativa-dominant strain has potent 24% THC. It delivers an energetic, creative high while also providing some relaxation.

New users should be cautious as overdoing it can cause paranoia. The strong cerebral buzz may be too much for some.

Haze Auto is easy to grow, even for beginners. No light cycle management needed thanks to autoflowering. Finishes quickly in 8-9 weeks.

Indoors, it stays short between 2-3 feet tall. Outdoors it can reach 5 feet with enough sun.

Yields are solid at 1.5+ ounces per square foot indoors. Outdoors around 3 to 7 ounces per plant.

For bigger yields and more plant control, try the photoperiod Haze instead.

2. Grape Ape Auto - 24% THC

Grape Ape Auto has very high 24% THC. It starts with an uplifting head high then mellows into a chilled out body buzz.

This easy strain grows well indoors or outdoors. The short, bushy plants reach around 1.5 feet tall.

Flowering is fast at just 7-8 weeks. Indoors it yields around 1.5 ounces per square foot. Outdoors around 5 ounces per plant.

The fast finish allows multiple outdoor harvests per season. The photoperiod version provides more control and higher yields given more time.

3. G13 Auto - 24% THC

G13 Auto from WeedSeedsExpress grown by Roberts on Growdiaries

This mostly indica has potent 24% THC, providing a mellow, relaxing high that relieves stress and pain. Higher doses can help insomnia.

New users should be cautious with the high THC levels to avoid paranoia or dizziness.

G13 Auto grows well indoors or outdoors. Indoor yields reach 450-550g/m2. Outdoors around 100g per plant.

It stays short at 90-120cm for discreet outdoor growing. The fast 8-9 week flowering allows multiple outdoor harvests.

Use hydroponics or quality soil with nutrients since it's a heavy feeder. The photoperiod version yields more with slower growing.

4. Critical Purple Auto - 25% THC

Critical Purple Auto from WeedSeedsExpress grown by Mother on Growdiaries

This indica-heavy strain has potent 25% THC. It provides complete relaxation and is ideal for nighttime unwinding.

Medically, it relieves pain, anxiety, nausea and stimulates appetite, benefiting chemo patients or those with eating issues.

The autoflowering genetics make growing super easy indoors or outdoors. Plants transition themselves to flower automatically.

Indoors, plants reach around 1 meter tall. Outdoors around 120cm. Yields are 400g/m2 indoors and 200g per plant outdoors.

5. Lemon Autoflower - 25% THC

Lemon Autoflower from WeedSeedsExpress grown by PEAKYPLANTERS on Growdiaries

This sativa-leaning strain has potent 25% THC. It lifts mood and relieves stress but new users should go slow.

The autoflowering genetics make it super easy to grow. Buds form in just 7-8 weeks from seed.

Indoors it stays short at 70cm, yielding 400g/m2. Outdoors it reaches 80-100cm tall, yielding up to 150g per plant.

The compact size suits discreet outdoor grows or tight indoor spaces. It combines zesty flavor and easy growing.

6. Gorilla Glue Autoflower - 26% THC

Gorilla Glue Auto from WeedSeedsExpress grown by Master_weeda and  smoking_hills9 on Growdiaries

The 26% THC creates a potent euphoric, relaxing high. New users should be cautious.

This easy autoflower transitions itself from vegetative to flowering. Pistils appear by week 2.

It finishes in just 8-10 weeks with thick, frosty buds. Indoors it stays short at 60-100cm, stretching taller outdoors to 100-150cm.

Yields are 550g/m2 indoors and 60-120g per outdoor plant.

Given time, the photoperiod Gorilla Glue provides even bigger harvests.

7. Bruce Banner Auto - 26% THC

Bruce Banner Auto from WeedSeedsExpress grown by Mosquito_Haarlem_Holland on Growdiaries

Bruce Banner Auto has very high 26% THC. The energetic, euphoric high boosts creativity and motivation with mellow side effects.

This robust autoflower thrives indoors or outdoors. The tall sativa-dom plants finish quickly in 10-13 weeks from seed.

Using organic nutrients can further increase the hefty yields. Indoors it produces up to 600g/m2 and 150g per plant outdoors.

For an autoflower, Bruce Banner gives very high yields. For even bigger yields and more control, choose the photoperiod Bruce Banner.

8. Hellfire OG Auto - 30% THC

Hellfire OG Auto from WeedSeedsExpress grown by Mosquito_Haarlem_Holland and smoking_hills9 on Growdiaries

This strain has nearly 30% THC. It starts with a fast euphoric head rush before deeply relaxing the body, relieving stress and tension.

It's effective at treating pain, inflammation, depression and more thanks to its potent effects. Avoid overdoing it to prevent anxiety.

As an autoflower, Hellfire OG grows well indoors or out with few demands. Warm weather and organic soil produce the best results.

The short, bushy plants suit tight indoor setups. Flowering takes 55-65 days, allowing multiple outdoor harvests where possible.

Yields are solid at 400g/m2 indoors and 150g per plant outdoors.

For larger yields and more control, choose the photoperiod Hellfire OG instead.

9. Blackberry Moonrocks Auto - 31% THC

This strain has very high THC at 31%. It starts with an euphoric head-high then relaxes the body.

The indica effects make it ideal for evening relaxation. However, the powerful high means caution for new users.

Blackberry Moonrocks grows well indoors or outdoors. Use quality soil and balance pH.

Indoor growing allows control over factors like light and temperature to increase yields. Training techniques like low-stress training can also boost yields.

Flowering takes 8-10 weeks. The quick flowering allows 2 outdoor harvests per season where possible.

For maximum production, consider the photoperiod version instead.

10. Fat Bastard Auto - 37% THC

This autoflowering cannabis strain has very high THC levels up to 37%. It produces a fast and intense high that leaves users deeply relaxed.

Despite being an autoflower, Fat Bastard grows quickly, finishing in under 3.5 months. Indoors it stays short, around 130cm, stretching slightly taller to 150cm outdoors.

Yields are very high for an autoflower. Indoors it can produce over 600g per sq meter. Outdoors it yields around 300g per plant.

The photoperiod version offers even bigger harvests without sacrificing potency.


Need More High THC Autoflower Strains?

We hope you found a strong weed strain from our list.

If you need more Autoflower options, please check our full range of marijuana seeds autoflower. You can filter the options to highlight those with High THC levels first.

You can also check out our catalog of High THC strains, which include both Autoflower and Photoperiod strains.

If you need help choosing or growing a strong autoflower strain, please email us at [email protected] - one of our experts will be glad to help.

Happy growing!