Top 10 Highest THC Strains In 2021

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For experienced marijuana connoisseurs or weed enthusiasts, potency is king. Many longtime smokers or pot fans specifically seek out high THC marijuana strains for the increased potency and psychoactive effects they receive from these cannabis types.

Fortunately, modern growers have produced a variety of high THC strains, in large part due to increased consumer demand. High THC cannabis strains produce a longer-lasting high, more medicinal effects, and even a boost to certain senses, like your smell and taste. Cannabis fans who like to chow down while high may especially like high THC strains!

But keep in mind that high THC cannabis strains are only appropriate for experienced smokers or users. Those who are new to enjoying cannabis recreationally should start with low THC strains to get used to the experience.

Additionally, growing high THC strains of cannabis often requires a little more attention to detail than normal. THC potency can vary dramatically based on plant nutrition, sunlight, and more.

Not sure where to start? Luckily for you, we’ve collected the 10 best high THC strains for 2021 below. Each has a detailed description so you know what to expect, along with a breakdown of each strain’s major characteristics. Let’s get started!

STRONGEST WEED STRAINS HIGHEST THC

Mimosa EVO

A 70% Sativa strain Mimosa EVO is a mix of the Purple Punch and Clementine strains produced by Symbiotic Genetics in the Emerald Triangle. With large buds, these seeds pack quite a punch and have tons of cannabinoids and terpenes.

Growers will appreciate these as they can grow suitably both indoors and outdoors, particularly in Mediterranean climates. With a potential THC cap of 30% in the right hands, these plants have the potential to supercharge your entire growing operation. Key facts about the Mimosa EVO strain include:

Height: 80 to 90 cm
Time to Bud: 65 to 70 days
THC: Up to 30%
Harvest Time: 10 to 11 weeks
Gr/M^2: 700-2000 Gr/M^2

All in all, the Mimosa EVO seeds are ideal for those who want to grow big buds, or those whose growing sites are ideally positioned for maximum sunlight or warmth. They’re also a great choice if you want to add super-high THC buds to your store offerings or for your personal use.

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strongest weed strains 2021

Mimosa X Orange Punch

Another super high THC seed strain, this 65% Indica hybrid is created from crossing Orange Punch and the above-mentioned Mimosa Evo. The resulting strain is fantastic for beginners and experienced growers alike. The flowers are colorful and grow perfectly in Mediterranean climates. 

Height: 70 to 80 cm indoors or 150 to 180 cm outdoors
Time to Bud: 55 to 60 days
THC: Up to 30%
Harvest Time: 9 to 10 weeks
Gr/M^2: 700-1500 Gr/M^2

The buds feature a citrus or candy-like flavor once dried and cured, and each plant is more compact than you might think, making it ideal for both indoor and outdoor growing. All in all, these beginner-friendly seeds are perfect for growers who want concentrated THC and a sparkling, sunny flavor that goes perfectly with the uplifting feeling Mimosa X Orange Punch brings.

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high thc weed strains 2021

Runtz Muffin

A new and highly potent seed strain from Barney’s Farm, Runtz Muffin is extremely high-quality and is perfect for marijuana connoisseurs and beginners alike. This seed produces a medium-sized plant indoors with a relatively fast flowering time, allowing a quick harvest when nourished correctly.

Height: 110 to 270 m
Time to Bud: 56 to 63 days
THC: 29%
Harvest Time: 1011 weeks
Gr/M^2: 550 to 1000 Gr/M^2

Plants grown outdoors can reach up to 200 cm in height. Both indoor and outdoor plants will produce a fruity fragrance, as well as flavors including Clementine, pineapple, and lavender. The resulting buds are stress-relieving and uplifting in every way. Ultimately, the Runtz Muffin strain is a fantastic pick for fans of light and uplifting MJ plus a high THC concentration for added psychoactive benefits.

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strongest weed strains

Blue Sunset Sherbet

Blue Sunset Sherbet is a 35% Sativa and 65% Indica hybrid, created by crossing the titular Sunset Sherbet with Purple Punch. The resulting compact and robust plants are fantastic for beginner growers looking for a bud they can reliably produce without worrying too much about perfect concentrations of light and water.

Height: 80 to 200 cm
Time to Bud: 59 to 63 days
THC: 28%
Harvest Time: 9 to 10 weeks
Gr/M^2: 650 to 1000 Gr/M^2

These seeds produce plants that are perfect for both indoor and outdoor cultivation, and the leaves come in exotic color ranges between purple, orange, red, and even blue. Many will appreciate the Blue Sunset Sherbet’s fantastic flavors, ranging between candy, citrus dust, and sweet berry.

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cookies gelato 5

Cookies Gelato

Ever wanted to combine Girl Scout cookies with quality cannabis? Now you can with Cookies Gelato, which offers up to 28% THC and which produces a downright psychedelic high with every toke. Naturally, these seeds produce buds with a sugary sweet flavor. Key facts about the Cookies Gelato strain include:

Height: 90 to 130 cm
Time to Bud: 8 to 9 weeks
THC: 28%
Harvest Time: 9 to 10 weeks
Gr/M^2: 600 to 650 Gr/M^2

Cookies Gelato is great for experienced growers wanting to make something of a dessert cannabis or just try something a little sweeter than their usual flavor profiles.

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strongest thc strains

Royal Gorilla

Royal Gorilla is a popular 50-50 strain between Indica and Sativa, offering high THC concentration and fantastic flavors. These seeds produce strong and flavorful buds as a result of the accidental crossing of several other previous seed strains, including Sour Dubb, Chocolate Diesel, and Chem’s Sis. Key facts about the Royal Gorilla strain include:

Height: 90 to 160 cm
Time to Bud: 8 to 10 weeks
THC: 27%
Harvest Time: 10 to 11 weeks
Gr/M^2: 50 to 550 Gr/M^2

Royal Gorilla is ultimately a blended seed that can produce excellent effects for both your mind and body. Due to its potency and mingled effects, it’s better suited for experienced growers compared to beginners just starting to experiment with home-growing cannabis.

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royal runtz 2

Royal Runtz

Derived from mixing strains from Gelato and Zkittelz, Royal Runtz produces very dense and compact flowers that are perfect for indoor growing. With a high THC content of 27%, this brand of seeds mixes Indica and Sativa genetics expertly. Key facts about the Royal Runtz strain include:

Height: 90 to 130 cm
Time to Bud: 8 to 9 weeks
THC: 27%
Harvest Time: 9 to 10 weeks
Gr/M^2: 400 to 450 Gr/M^2

Royal Runtz produces sweet and candy-like flavors, as well as relaxing psychoactive effects.

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hulkberry automatic

Green Gelato 

Mix Thin Mint Cookies and Sunset Sherbet and you get Green Gelato: an innovative strain that can produce THC concentrations of up to 27%. This potent variety is fantastic for new growers and experienced growers alike, as it flowers in just eight weeks and responds very well to plant training. Key facts about the Green Gelato strain include:

Height: 80 to 120 cm
Time to Bud: 8 to 10 weeks
THC: 27%
Harvest Time: 10 to 11 weeks
Gr/M^2: 800 Gr/M^2

Green Gelato is powerful yet relaxing at the same time and produces vibrant green flowers that are perfect for showing off to your friends just before harvest.

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high thc strains 2021

HulkBerry

For fans of Sativa seeds, it doesn’t get much better than Hulkberry. This Sativa dominated strain produces plants with a whopping 20% THC content. Also called Bruce Banner #3, this strain is excellent for growing both indoors and outdoors and thrives in both SoG and SCRoG systems.

Height: 60 to 200 cm
Time to Bud: 9 to 10 weeks
THC: 28%
Harvest Time: 10 to 11 weeks
Gr/M^2: 400 to 700 Gr/M^2

Each plant produces a noticeable perfume that mixes lemon lime and fruitier scents. Each puff, meanwhile, produces a clear and energetic high, making this ideal for experienced growers wanting to produce quality product. Hulkberry is a fantastic seed choice for fans of the Bruce Banner strain line and a high-THC smoking experience.

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royal gorilla 20

Girl Scout Cookies

Girl Scout Cookies is a famous Californian strain of feminized seeds has super high THC levels that reach up to 28%. Each plant produces highly colorful buds that combine pink, purple, and orange use. As a 50-50 Sativa and Indica strain, this indoor strain features a very short flowering time and a fantastic fragrance that expertly blends cherry, lemon, and sweet fruit scents.Key facts about the Girl Scout Cookies strain include:

Height: 65 to 100 cm
Time to Bud: 55 to 60 days
THC: 28-30%
Harvest Time: 8 to 9 weeks
Gr/M^2: 450 Gr/m^2

Though it’s not ideal for beginner smokers, Girl Scout Cookies is sure to put a smile on your face as much as its titular snack. Combine them with real girl scout cookies when you get the munchies!  As you can see, there are plenty of high THC seed strains to choose from. Our advice? Pick the one with the best flavor profile and growing constraints for your situation and give the seeds a shot! There’s a seed strain for you no matter your experience level, allowing you to grow high THC cannabis in a matter of months.

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