High THC Cannabis Strains

Strains that are high in THC, the psychoactive compound contained in cannabis, can deliver the most potent smoke for the ultimate in relaxation or powerful uplifting euphoria. But high THC content doesn’t just mean that these cannabis varieties can be optimal for recreational users who seek the ultimate for chilling and relaxation. These strains rich in THC can also be a good choice for those users who need very potent medicine that can help with pain relief and other medical conditions.

Generally, cannabis strains that consistently have THC levels of 20 percent or higher are considered to be very potent. Let’s take a look at some of the cannabis strains that have earned awards for their potency.

Ghost Train Haze


Ghost Train Haze may be the most popular sativa-dominant hybrid out there, named by High Times as one of the Strongest Strains on Earth. A mix of Ghost OG and Neville’s Wreck, the strain’s genetics are 70 percent sativa and 30 percent indica, although it has been listed here because of its effects.

Ghost Train Haze represents the prototypical sativa profile, as it will provide a high that is energetic, uplifting and uplifting. If one is naturally creative, this strain will wake that up!
It once tested for 28 percent THC, which is probably the highest result a sativa has tested for, although this isn’t confirmed data.

Only when this strain is tasted will its indica presence be seen, as it gives off a bit of a kushy flavour, with just a hint of fruit.

Bruce Banner

THC Range: As high as 30 percent
One of the most famed strains, Bruce Banner, aka the “Strongest Strain on Earth” according to High Times. This regular strain has been measured up to 30% of THC which should tell serious cannabis enthusiasts all they need to know why they absolutely would want to grow this legend. The head high is intensely euphoric, combined with strong creativity and a whole-body mood boost. Energy levels are high, making this a good daytime strain. Bruce Banner is a highly effective painkiller.


THC Range: 27 – 32 percent
A-Dub is an intensely potent indica dominant hybrid strain that’s an insanely dank cross between Sour Double and Alien Dawg. Because of its extremely high THC level and indica dominated genetics, it is not recommended for new users, who may experience acute paranoia and dizziness upon smoking even a small amount.

Gorilla Glue

THC Range: 25 – 28 percent
Gorilla Glue is a spectacular autoflower that shines with incredible resin production, very high potency and a superb taste. This type of cannabis is often used by those that feel a need to self-medicate. It can help with reducing chronic pain such as arthritis and chronic back pain.

Girl Scout Cookies

THC Range: 17 – 28 percent
Growers seeking the best US autoflowering genetics have just found their perfect match. Girl Scout Cookies, the absolute killer-strain from the West Coast, is now about to conquer Europe. THC levels are skyrocketing up to 28%. This strain provides the best aspects of both sativa and indica, and the high is powerful, happy, and euphoric, but with couch-lock body effects and feelings of lethargy.

Afghan Kush

Starting to see a trend here? It’s not that we really like kushes—I mean we do, but that’s not the point—but they really are some of the highest THC strains.

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Afghan Kush is an indica that has been popular for a while now, as it is the product of the Hindu Kush mountain range. This strain has been tested left and right, with various results from 16 percent to more than 25 percent THC content, so the percentage can’t really be pinpointed.

Afgahn Kush is very easy to grow both indoors and outside, as it is resistant to mould and mildew, and has huge yields compared to its size.


Hypnotic is an Indica-dominant hybrid regarded as an icon for offering a stable and reliable behaviour. The mind-blowing effect it provides is both physical and euphoria-producing.

White Fire OG

THC Range: 22 – 28 percent
White Fire OG is also referred to as WiFi OG. It produces frosted buds that are quite valuable to the entire medical marijuana industry. It is a cross between the White and Fire OG. It has a sour diesel like aroma with a touch of citrus. It has a sweet taste with an earthy flavour. It is considered to be one of the finest medical marijuana strains and has several benefits.

Critical Kush

THC Range: 14 – 25 percent
Critical Kush by Barney’s Farm is a very successful cross between the Critical Mass, itself a hybrid of Afghani x Skunk #1 and OG Kush, a North Californian with Chew Dawg and Pakistani Kush heritage. An Indica dominant smoke that induces a strong stone, making it a great choice for both relaxing and medical purposes.

Strawberry Cough

THC Range: 25 – 26 Percent
Strawberry Cough is a strain that holds true to its name. A sweet strawberry smell and subtle after taste is accompanied by a thick smoke that leaves even veteran tokers coughing. This strain is sativa dominant with an 80:20 sativa/indica ratio.

Sour Diesel

Sour Diesel, sometimes called Sour D, is an invigorating sativa-dominant strain named after its pungent, diesel-like aroma. This fast-acting strain delivers energizing, dreamy cerebral effects that have pushed Sour Diesel to its legendary status. Stress, pain, and depression fade away in long-lasting relief that makes Sour Diesel a top choice among medical patients.

[Updated, originally published 18.4. 2017]

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