In recent decades, many breeders worldwide have concentrated on creating new strains with the highest possible THC percentage. Nowadays strains with more than 20% THC, rising to percentages of around 30%, are no exception.
THC is the active ingredient of cannabis that has made the plant popular, famous and notorious. The effect of weed that is called 'high / stoned' is largely caused by THC.
Take a look at 10 of the strongest THC-rich strains available on the market today.
With THC levels reaching up to 32%, Chem Berry D has to be one of the most potent strains currently available. Besides producing a strong cerebral stone that can quickly become sedative in large doses, Chem Berry D also boasts an interesting terpene profile that combines both fruity and chemical fuel aromas.
Best of all, Chem Berry D is relatively easy to grow. While it can take a full 10 weeks to flower, this strain is resilient and performs well both indoors and out. Chem Berry D produces large harvests, despite only growing into a medium-sized plant.
There’s a reason this strain is named after the mighty Hulk. Bruce Banner BX 2.0 is a powerhouse, consistently reaching a THC level of up to 30%. It’s won numerous awards, as well the honorary High Times title of “one of the strongest strains on Earth.”
As a cross between Strawberry Diesel and Bruce Banner #3, this strain grows fast, reaches a massive size, and produces a big harvest. Bruce Banner BX 2.0 usually needs a full 10 weeks to flower, as well as some training and pruning to control its height; hence, it’s not the best strain for beginner growers.
There’s a lot a name can tell you about a particular cannabis strain, and that’s especially true for HulkBerry. This is a hardy strain that produces potent buds with rich berry flavors and aromas. Its THC level clocks in at around 27%, producing a long-lasting, energetic euphoria (when taken in moderation).
HulkBerry is a slightly sativa-dominant strain, which shines through in its physical traits. This is a tall plant that tends to stretch, meaning it’ll need some training and pruning to be grown indoors. Nonetheless, despite a long flowering time, this tends to be an easy-to-grow strain that produces good harvests in a variety of grow environments.
Glue strains get their name from their ability to produce thick layers of sticky trichomes. And, given that trichomes are the center of cannabinoid and terpene production, these strains have particularly rich chemical profiles. That’s exactly the case with Original Glue. Thanks to its ability to produce big, frosty buds, this strain boasts a THC level regularly reaching 30%.
Being a three-way cross between Chem’s Sister, Chocolate Diesel, and Sour Dubb, Original Glue is a really interesting variety. It dazzles with aromas that combine sweet citrus notes with deep earthy, slightly piney undertones. Thanks to its high THC level, this strain produces an intense narcotic stone that’ll leave you “glued” to the couch in no time.
Some strains need little introduction, and this is one of them. As a true Cali classic, Girl Scout Cookies has built a massive reputation and cult following among cannabis enthusiasts. While there are many varieties of this strain (and many imitations), original Californian GSC stands out for its potent THC level (25–28%).
Girl Scout Cookies got its name from its complex aromas that are both sweet and fruity, yet also very minty. One of the reasons GSC has become so popular is its strong high that perfectly balances cerebral stimulation with physical relaxation. Given its genetics, potency, flavor, and unique effects, it’s really no wonder this strain has won so many Cannabis Cups and titles.
Green Gelato is a cross between Sunset Sherbet and Thin Mint Girl Scout Cookies, both of which were bred from unique US genetics. The result is a big, strong strain with a THC level that tends to sit at 25–27%. Despite its potency, Green Gelato boasts an interesting mix of aromas/flavors that combine sweet, fruity, and earthy notes.
reen Gelato normally produces a strong, uplifting euphoria at first. However, given its potency, it can quickly leave you feeling sedated, relaxed, and ready to sink into the couch for a good couple of hours. In the grow room, Green Gelato usually needs 8–9 weeks of flowering and can reach a height of 80–120cm indoors and up to 200cm outdoors.
Romulan Haze is a very potent Haze variety bred using both Dutch and US genetics. It produces a strong, uplifting cerebral euphoria that can last for hours. While its exact THC level tends to vary, Romulan Haze is known to be reliably potent, regardless of where or how it’s grown. Come harvest time, this strain will be loaded with big, fluffy buds covered in thick trichomes.
Unlike some of the other strains on this list, Romulan Haze can be tricky for beginner growers to handle. Thanks to its sativa-dominant genetics, this plant can stretch and requires training to keep it contained in small spaces. It also needs a full 10 weeks to flower, which can be demanding for inexperienced growers.
Where’s My Bike might not be well-known, but this strain is up there in the big leagues in terms of potency. Many people treasure this strain for its big, resinous buds, which are perfect for making hash and other concentrates. And while its THC level also varies a bit, a single hit of Where’s My Bike will reassure you of its potency.
Where’s My Bike was bred using Amnesia—a Dutch classic—and Biker Kush, a homage to the potent hybrids originating from California. The result is a big, bushy strain that flowers in roughly 9–12 weeks. But trust us, it’s well worth the wait. Where’s My Bike produces a super strong, long-lasting euphoria that’s hard to beat.
This is another one of those strains that says a lot just with its name. Island Sweet Skunk is, you guessed it, a hybrid Skunk variety with super sweet, tropical, and slightly spicy flavors/aromas. With a THC level consistently reaching around 23%, this strain is potent and very delicious.
Within just a few minutes, Island Sweet Skunk’s high kicks in, leaving you feeling elevated, energetic, happy, and creative. It makes for a great daytime strain that won’t leave you melting into the cushions after just a few hits. Instead, you can enjoy Island Sweet Skunk and still be productive. In the grow room, this strain needs regular attention and a full 10 weeks to flower.
Gorilla Zkittlez is an impressive hybrid cross between Gorilla and Zkittlez. It boasts a fresh, sweet, and fruity aroma, and a THC level up to 24%. It produces a strong stone that’ll leave you feeling calm and relaxed within minutes. In larger doses, this strain is very sedative and makes for a mean nightcap.
Thanks to its indica-dominant genetics, Gorilla Zkittlez grows short and bulky, flowering in just 8 weeks. Due to its big, tight buds, it usually needs a bit of attention and good ventilation. Like any good indica, Gorilla Zkittlez produces a great harvest of up to 700g/m² indoors and up to 2500g/plant outdoors.