Strains & Products 

Cannabis strain and product insights with curated strain lists, new devices, and other fun facts.

What Are the Strongest Cannabis Strains?

Leafly users often ask us what the strongest strains of cannabis are, and before we attempt to tackle that question, it’s worth explaining why the answer is kind of tricky.

The strongest strains are obviously those with the highest THC content. Generally speaking, anything that surpasses 20 percent could be considered pretty potent. However, let’s say one grower’s harvest of Kosher Kush tested at 22 percent THC. Due to differences in environmental conditions, growing techniques, and genetic phenotypes, another grower’s Kosher Kush could come out wildly below the mark and test at, let’s say, 15 percent.

Even with this variability, there are strains that tend to express higher levels of THC thanks to strong genetics and selective breeding. Let’s take a look at some of the champion THC heavyweights that have earned awards for their potency as well as some user reviews that testify to their strength.

 

Leafly Girl Scout Cookies cannabis strain tile Leafly Girl Scout Cookies cannabis strain effects

Girl Scout Cookies hauled its way up the ladder of fame in recent years, and it isn’t hard to see why. The genetics in this hybrid are strong: according to Steep Hill’s lab data, Girl Scout Cookies typically tests upwards to 28 percent THC, and even the low end of its average is a decently impressive 17 percent. The Girl Scout Cookies experience begins with a crushing wave of blissful euphoria, one that enshrouds both mind and body with warm relaxation for hours.

Review of Girl Scout Cookies by Leafly user herbknight

“Incredible jelly foot. Very nice body pudding. Creativity mixed with amazing peaks of HD colors.”

 

Leafly Kosher Kush cannabis strain tile Leafly Kosher Kush cannabis strain effects

Kosher Kush first blessed the world with its presence in 2010 and has been nabbing Cannabis Cup awards ever since. Its genetic background may be a mystery, but this indica’s keepers at DNA Genetics have refined a champion strain that consistently breaches 20 percent THC. Wrapped in a thick blanket of crystalline resin, you’ll hardly need a closer look to see that this tranquilizing indica is not one for the novices.

Review of Kosher Kush by Leafly user ricegrain

“I can’t feel my face… or my arms, or my feet, or anything for that matter. It’s as though I’m a weightless entity with a somewhat foggy- consciousness, floating on the patio. praise Yahweh I’m high off my tuchis.”

 

Leafly Bruce Banner cannabis strain tile Leafly Bruce Banner cannabis strain effects

Bruce Banner, appropriately named after the Hulk’s alter ego, is a heavy-duty hybrid with a THC high-water mark of almost 29 percent. Rated the strongest strain in 2014 by High Times following its victory in the 2013 Denver Cannabis Cup, Bruce Banner has since carved itself quite the reputation. Powered by OG Kush and Strawberry Diesel genetics, Bruce Banner delivers a dizzying punch of euphoria that anchors your body in deep relaxation.

 

Leafly Ghost Train Haze cannabis strain tile Leafly Ghost Train Haze cannabis strain effects

In the last few years, the Cannabis Cup leaderboards saw a new rising star: the lively and vigorous sativa known as Ghost Train Haze. Bred by Rare Dankness Seeds, Ghost Train Haze had the highest THC content of any 2011 Cannabis Cup submissions, weighing in at a staggering 25.5 percent THC. Inheriting genetics from Ghost OG and Neville’s Wreck, this sativa’s potency takes form in a jolt of euphoric energy that goes straight to the head, feeding focus and creativity.

Review of Ghost Train Haze by Leafly user thepiginzen

“My initial response was yelling. It’s almost unreasonably potent. Smooth and citrusy too, but potent. Did I mention it was potent? It was potent. A next-level sativa. Made me feel like a marijuana n00b up until now. CAREFUL, it’s potent.”

 

Leafly Gorilla Glue #4 cannabis strain tile Leafly Gorilla Glue #4 cannabis strain effects

Gorilla Glue is named for the stickiness of its resinous buds, and this hybrid certainly lives up to her name. It isn’t rare for Gorilla Glue to hit the mid- to upper-twenties in a potency analysis, and she’s got multiple Cannabis Cup awards to back that claim up. But we doubt you’ll need the proof when this hybrid’s got you gorilla-glued to the couch in stupefied contentment.

 

Leafly Strawberry Cough cannabis strain tile Leafly Strawberry Cough cannabis strain effects

What smells like a bushel of fresh strawberries and has a THC content that’ll make even the most seasoned veteran cough? It’s Strawberry Cough, winner of numerous Cannabis Cups and the hearts of cannabis enthusiasts around the world. The story goes that Kyle Kushman inherited a really sad-looking mystery clone from a friend’s garden and polished it into the sweet-smelling THC engine that now boasts heights of 25 to 26 percent.

 

Leafly The White cannabis strain tile Leafly The White cannabis strain effects

Named for the whiteout of crystal resin cloaking her buds, The White has become a godsend for breeders looking to improve the potency of their genetics. Routinely testing between 20 and 28 percent THC, The White delivers a disorienting blizzard of euphoric delirium that commands relaxation.

 

Leafly Death Star cannabis strain tile Leafly Death Star cannabis strain effects

With a THC profile that typically dances between 20 and 24 percent, Death Star will surely wreak as much havoc as the Galactic Empire. Using its great psychoactive forces, this Sensi Star and Sour Diesel hybrid commands you to chill out as it imposes powerfully euphoric and sedating effects.

Review of Death Star by Leafly user laketrash

“Brain still trying to float out of head.”

 

Leafly Red Dragon cannabis strain tile Leafly Red Dragon cannabis strain effects

A Barney’s Farm creation, Red Dragon is another familiar name among Cannabis Cup winners. Fiery red hairs shoot out from resin-packed buds, giving this strain a fierce dragon-like appearance. Accurately so, because this strain’s path of destruction entails an intoxicating cerebral blast that’ll knock bad moods and stress (and possibly common sense) right out.

Review of Red Dragon by Leafly user someguy2448

“I can barely write anything that makes coherent sense right now, omgggggggggggg……..”

 

Leafly White Fire OG cannabis strain tile Leafly White Fire OG cannabis strain effects

Born from The White and Fire OG, White Fire OG (also known as WiFi OG) is a force not to be trifled with. Steep Hill’s testing data shows the impressive THC potential of this hybrid, with average levels falling between 22 and 30 percent. Its uplifting effects launch your mood into the clouds, an elevated feeling that will shake creativity and happiness wide awake.

 

Which other heavy-handed strains belong on this list? Tell us about them in the comments section!