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High THC Strains

The “Best of the Best” when it comes to THC content! 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. Some cannabis strains with a particular high THC content can even make for outright psychedelic experiences!

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.

The High THC strains category here in the Zamnesia web shop features these select strains that are known for their particular high THC content. Find your favourite High THC strain in no time here at Zamnesia!

Feeling overwhelmed by all the different cannabis strains out there? Use the Cannabis Seedfinder and find the strain that best suits your growing needs in 6 simple steps.

High THC Strains - Click here for more info

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621 products

Ghost Train Haze Autoflower (Zamnesia Seeds) feminized

Compact plants: Ghost Train Haze Auto reaches max heights of 120–140 cm. Speedy flowering time: Harvest real Haze weed just 12–14 weeks after sprouting your seeds. Top-shelf potency: Ghost Train Haze Auto packs 24% THC and dank diesel terpenes. Excellent yields: Ghost Train Haze Auto yields up to 550 g/m² indoors or 200 g/plant outdoors.

(230)

Seeds

£22.38

+26 Extra Gift Points

20% off

Black Runtz (Zamnesia Seeds) feminized

Tantalising tastes: Enjoy flavours of sourness, berries, and fruit. Epic genetics: The offspring of legendary parents Zkittlez, Gelato, and Runtz. Rapid flowering: Watch your buds burst into maturity in as little as 8 weeks. Mind-blowing power: Prepare for a THC content of 24%.

(80)

Seeds

£22.38 £17.90

+26 Extra Gift Points

Fat Bastard Auto (Blimburn Seeds) feminized

If fat, sticky buds with a dank, skunky aroma are your thing, look no further—Fat Bastard Auto is a bulky hybrid bred from a variety of unique strains. Easy to cultivate, potent, and riddled with aromatic terpenes, this strain will impress even the pickiest growers and smokers with the quality and size of its yields. Best of all, Fat Bastard Auto goes from seed to harvest in just 10 weeks.

(32)

Seeds

£33.58

Permanent Marker Autoflower (Zamnesia Seeds)

Award-winning genetics: Permanent Marker was Leafly's Strain of the Year in 2023. Express harvest: These auto seeds are harvest-ready in just 9–10 weeks. Heavy high: Perfect for unwinding at the end of the day! USA flair: Permanent Marker is originally from California's Seed Junky Genetics.

(65)

Seeds

£22.38

+26 Extra Gift Points

20% off

Pink Rozay (Zamnesia Seeds) feminized

Raise your glass to Pink Rozay, a US-bred strain that's not afraid to show off! Combining the best of Lemonchello and London Pound Cake, this strain packs a wild THC content, a superb social high, and wine-like aromas that'll have you begging for another glass—or hit, that is.

(214)

Seeds

£22.38 £17.90

+26 Extra Gift Points

Do-Si-Dos F1 Autoflower (Zamnesia Seeds) feminized

From the team at Zamnesia Seeds comes Do-Si-Dos F1 Autoflower. Harnessing uniform and reliable F1 genetics, this cultivar is not only incredibly simple and hassle-free to grow, but also delivers great-tasting and potent buds. Plants stay close to the ground and provide a dependable cultivation experience that will appeal to all.

(102)

Seeds

£30.13

+36 Extra Gift Points

20% off

Fat Bastard (Blimburn Seeds) feminized

If you're looking for a strain that will really deliver come harvest time, make space for Blimburn Seeds' Fat Bastard. This variety has the potential to pump out up to a whopping 900 g/plant in outdoor conditions. What's more, flowers are of unrivalled quality and power—full of resin and skunky aromas enhanced by citrus undertones.

(20)

Seeds

£33.58 £26.86

Slurricane (Zamnesia Seeds) feminized

Top US genetics: Enjoy the original Slurricane, bred from Purple Punch x Do-Si-Dos. Complex terps: Slurricane has sweet and spicy berry aromas/flavours. Compact structure: Plants are stout and discreet. Heavy yields: Slurricane yields up to 450 g/m² indoors and 650 g/plant outside.

(35)

Seeds

£22.38

+26 Extra Gift Points

Gelonade (Zamnesia Seeds) feminized

Trusted and loved genetics: This hybrid is the lovechild of Gelato and Lemon Tree. Satisfying harvests: Reared in optimal conditions, Gelonade pleases growers with healthy yields. Exciting terpene profile: Refreshing citrus and spicy pepper combine to provide a fruity blend with a kick. Soothing effects: Excellent when you need to loosen up and relax.

(57)

OG Kush can enhance any genetic pairing, so when our breeders coupled it with the beloved Skywalker, they created a superb hybrid indeed—Skywalker OG. This plant contains indica-dominant genetics, with a 70% indica and 30% sativa breakdown. At 24% THC, it's all about potent effects, soothing and relaxing the body while uplifting the mood. And don't sleep on her earthy, spicy flavor either!

(35)

Seeds

£22.38

+26 Extra Gift Points

Passion Fruitz (Zamnesia Seeds) feminized

Sweet and super fruity: Passion Fruitz is packed with delicious tropical citrus terps. Timeless genetics: Descends from the almighty OG Kush. Tall plants with XL yields: Ideal for larger spaces. Potent but balanced effects: With 24% THC, Passion Fruitz relaxes both the body and mind after a single toke.

(8)

Seeds

£22.38

+26 Extra Gift Points

Blackberry Moonrocks (Blimburn Seeds) feminized

Meet Blackberry Moonrocks, the lovechild of Blue Moonrocks and Blackberry Kush, straight from the extensive catalogue of Blimburn Seeds. This indica-dominant plant delivers interesting berry and lavender flavours alongside uplifting effects. It will suit moderately experienced growers looking for a rewarding growing project.

(12)

Seeds

£33.58

Larry Bird Kush (Zamnesia Seeds) feminized

This legendary strain by Zamnesia is named after Larry Bird, the famous Boston Celtics basketball player. The nearly perfect hybrid (50/50), made from a Sunset Sherbert and a Girl Scout Cookies Thin Mint phenotype shines with a fantastic aroma that is sweet, tangy, and minty, and a great high that is relaxing yet wonderfully upbeat and mood lifting.

(81)

Seeds

£24.10

+28 Extra Gift Points

Jealousy (Zamnesia Seeds) feminized

Jealousy, a superb creation from Zamnesia, hit the ground running, and was named Leafly Strain of the Year 2022. It's got plenty to love, including famous parentage, good potency, excellent yield potential, and complex aromas and flavours. This slightly indica-dominant lady produces pronounced effects, making users relaxed and happy, ready for a quiet night in or a fun evening out with friends.

(63)

Seeds

£22.38

+26 Extra Gift Points

Motorbreath Autoflower (Zamnesia Seeds) feminized

Dank fuel aromas: Motorbreath Autoflower will leave your house smelling like a mechanic's shop with her strong fuel terps. Very high potency: Expect to harvest frosty buds packing 24% THC and a heavy, relaxing stone. Speedy harvests: Motorbreath Auto goes from seed to harvest in just 12 weeks. Stellar genetics: A direct descendant of the almighty Chemdawg.

(31)

Seeds

£22.38

+26 Extra Gift Points

If it's speed and convenience you're after, then look no further. GG#4 Auto by Blimburn Seeds packs the beloved traits of Original Glue into a fast, compact seed that goes from seed to harvest in just 8–10 weeks. Order your seeds now and enjoy a speedy harvest of top-shelf GG#4 in no time.

(9)

Seeds

£21.09

Motorbreath (Zamnesia Seeds) feminized

Beloved US genetics: Motorbreath stems from the legendary Chemdawg and SFV OG. Top-shelf potency: Harvest buds with up to 26% THC and bold diesel aromas. Strong effects: Motorbreath is ideal for experienced cannabis users seeking a heavy-hitting stone. Easy growth traits: Expect compact, resilient, and high-yielding plants.

(36)

Seeds

£22.38

+26 Extra Gift Points

Cosmic Noodles Autoflower (Zamnesia Seeds) feminized

We love catering to all types of growers, and this time our breeders crafted something special for lovers of autoflowers: Cosmic Noodles Autoflower. This neat auto is quite manageable, only slightly exceeding 100cm in height, which means it will suit low-key operations well. Its 60% indica influence creates robust, productive plants with rich aromas and great potency.

(51)

Seeds

£22.38

+26 Extra Gift Points

Frosted Guava (Zamnesia Seeds) feminized

Frosted Guava is a super-resinous indica-dominant treat bred from Guava and Frosted Skywalker. Balancing versatile grow traits with exotic, fruity aromas and a relaxing, clear-headed high, Frosted Guava makes a great addition to any cannabis garden.

(40)

Seeds

£22.38

+26 Extra Gift Points

Glookies Auto (Blimburn Seeds) feminized

What do you get when you cross GSC and Original Glue? Glookies, of course. Add a touch of ruderalis to the mix and voilà—you've got Glookies Auto, an autoflowering indica-dominant hybrid packing the best traits of two of the most important cannabis strains of modern times. Need we say more? Order your seeds here now.

Grizzly Glue (Zamnesia Seeds) feminized

Every weed grower deserves to have a prime cut of Glue in their garden. If you've reached the Bear rank of the Zamnesia TRIBE, your time has come. Order Grizzly Glue, an exclusive GG#4 cross, today, and be among the few privileged gardeners blessed with the opportunity to grow this unique cultivar, which boasts that iconic Glue stank and a heavy stone to match.

(86)

Seeds

700 Gift Points

Cafe Racer Auto is a vigorous, potent plant with plenty of personality. This autoflowering specimen races through its life cycle to deliver ample yields of fruity, resinous buds. Coupled with balanced effects that don't overwhelm, this plant is a keeper!

(2)

Seeds

£26.68

Chemdog 4 (Blimburn Seeds) feminized

Chemdawg is the pinnacle of the Chem genetic line. Discovered by Greg Krzanowski in 1991 after attending a Grateful Dead concert, Chemdawg has been used to create countless new hybrids, infusing them with its stinky fuel aroma and uplifting buzz. Now, with these feminized Chemdog #4 seeds by Blimburn, you can grow real Chem weed at home indoors, outside, or in a greenhouse.

(2)

Seeds

£25.82

Bruce Banner 3 (Blimburn Seeds) feminized

A potent descendant of OG Kush and Strawberry Diesel, Bruce Banner #3 is a cannabis force to be reckoned with. Breeders at Blimburn Seeds created an easygoing hybrid that amazes when harvest time rolls around. The final product has loads of bag appeal, boasting an abundance of resin, terpenes, and THC.

(1)

Seeds

£24.93

New

Glitter Bomb (Blimburn Seeds) feminized

Glitter Bomb is a 50/50 feminised hybrid from Blimburn, rich in resin with THC levels reaching 25–29 %. It delivers bold notes of blueberry, grape and fuel, coated in a sparkling layer of trichomes. Expect euphoric and relaxing effects. Ideal for experienced growers seeking flavourful, high-resin harvests in 9–10 weeks.

Seeds

£33.58

New

Donny Burger (Blimburn Seeds) feminized

Donny Burger is a 70% Indica‑dominant feminised strain from Blimburn Seeds, featuring exceptionally high THC (27–30%). Expect deep physical relaxation and mild euphoria, with earthy, garlic-cheese aromas underpinned by spicy pepper notes. Ideal for experienced growers after resin-rich, potent harvests within 9–10 weeks.

Seeds

£33.58

New

Stardawg (Blimburn Seeds) feminized

Stardawg is a 45% Indica / 55% Sativa hybrid from Blimburn Seeds, known for its energising effects and bold diesel-pine flavours. With THC levels reaching up to 25%, it delivers clarity and focus, making it ideal for cultivators seeking vigorous growth, resin-rich buds, and reliable medium yields.

Seeds

£33.58

New

Cap Junky (Blimburn Seeds) feminized

Cap Junky is a powerful feminised cannabis strain (60% Indica) by Blimburn Seeds. With THC levels of 33–34%, it delivers deeply relaxing effects and rich, layered flavours of earth, vanilla and mint. Ideal for seasoned growers seeking top-shelf yields and terpene-rich, resin-packed buds.

Seeds

£33.58

Apple Fritter Auto (Blimburn Seeds) feminized

Bold fruity terps, 25% THC, and a life cycle of just 8–10 weeks—you'd be hard-pressed to find anything worth complaining about when growing and smoking Apple Fritter Auto by Blimburn Seeds. Order your seeds today to grow this mouthwatering US hybrid at home in weeks!

Seeds

£33.58

Gelato (Blimburn Seeds) feminized

Gelato is a beautifully balanced cannabis hybrid with loads to offer both growers and tokers. Its formidable parent strains, Sunset Sherbet and Thin Mint Girl Scout Cookies, ensured Gelato has bags of THC and tons of flavour. On top of that, it's not difficult to grow and can produce smashing yields with lots of sticky resin.

Seeds

£25.79

Milky Way F1 Auto from the team at Royal Queen Seeds is unlike anything seen before on this green Earth. This F1 hybrid produces uniform plants with superb yields of hugely flavourful and potent buds that will satisfy all smokers and growers. Typically taking just 74 days from germination to harvest, this is a truly show-stopping strain.

(36)

Seeds

£32.72

20% off

Green Gelato (Royal Queen Seeds) Feminized

Perhaps one of the dankest and tastiest Cookies hybrids, Green Gelato by Royal Queen Seeds reigns in a new era of connoisseur cannabis. The delicious Thin Mint Cookies and the mouth-watering Sunset Sherbet, arguably the best-tasting Cookies genetics from the SF Bay area, come together in what is one of the most luscious dessert cannabis strains that you can grow today.

The legendary cross of Blueberry and Mazar, Royal Skywalker delivers a potent, cerebral rush that quickly dies down into a relaxing physical stone. Ideal for quiet nights in watching movies, listening to music, or simply unwinding on the couch.

(7)

Seeds

£27.98

Do-Si-Dos (Royal Queen Seeds) feminized

Looking for a new favourite indica? Look no further. With 25% THC, earthy-sweet flavours and a soothing euphoria, Do-Si-Dos is bound to blow you away. Plus, she's a heavy-yielder, too, delivering up to 600 g/plant! Need we say more? Get these premium USA seeds here now.

Seeds

£26.26

Forbidden Fruit (Royal Queen Seeds) feminized

Give in to temptation with Forbidden Fruit by Royal Queen Seeds. Expertly bred from a stellar genetic lineage, this 70% indica queen deserves a spot in your garden quick-smart. Don't believe us? Put her to the test today and thank us later for the bountiful harvest of dense, fruity-sweet buds packed with THC!

Seeds

£21.52

LSD (Barney's Farm) feminized

LSD is an ultra strong Indica dominant strain, that owes its name to the amazing experience it guarantees. Body stone will leave you grounded physically, but your mind will get on a faraway trip to the depths of your consciousness. Genetically a cross between Skunk #1 and Mazar.

(123)

Seeds

£31.83

Critical Kush (Barney's Farm) feminized

Critical Kush by Barney's Farm is a very successful cross between Critical Mass, itself a hybrid of Afghani x Skunk #1, and OG Kush, a Northern Californian strain with Chemdawg and Pakistani Kush heritage. This impressive marriage ultimately results in an indica-dominant smoke that induces a strong stone, making it a great choice for relaxing and medicinal purposes.

An incredible collab from the breeders at Barney's Farm and Doja Exclusive, RS11 x Banana boasts a premium mix of genetics that's sure to impress even the most seasoned growers. Order your seeds now to enjoy 30% THC, XL yields, and delicious terps.

(6)

Seeds

£36.16

White Runtz combines Gelato and Zkittlez, and the results are as you'd expect—incredible. With almost 30% THC, huge yields, and subtle flavours, what are you waiting for? Get your seeds now and grow true fire at home!

Seeds

£34.87

The feminized Tutankhamon by Pyramid Seeds is a very special AK-47 with a very high THC level. This is the perfect strain to grow your own mother-plant. It is small, only 80-110cm, and branches nicely, so you can have many clones. Tutankhamon requires 60-65 days of flowering to produce its very compact buds with an intense Skunk flavor - 500 grams, of which 22% is pure THC.

Success is guaranteed when two esteemed cannabis varieties get crossed. In the case of Sour Strawberry, these two superpowers are Strawberry Kush and Sour Diesel, each of which brings unique and desirable traits to the table. As a result, Sour Strawberry is scrumptious, potent, and highly productive, pleasing both tokers and growers the world over.

(1)

Seeds

£27.28

Auto Ramses (Pyramid Seeds) Feminized

Auto Ramses brings a majestic stature and superb yield potential to the autoflowering world. Descending from a fierce Haze specimen, this cultivar is capable of delivering a whirlwind cerebral high alongside a rush of dank citrus flavour. And when we say her yields are impressive, we mean it!

Seeds

£30.14

On the hunt for potency, but not to the detriment of flavour? Then we've got just the thing for you. Forbidden Runtz XL Auto is a great-tasting, potent powerhouse that impresses from seed to smoke. But be warned, such potency means users are best off proceeding with caution. And not only is the potency “XL”, so are the yields!

If you're after dense buds that sparkle with resin, it's time to try Orange Apricot Glue XL Auto. Straight from Sweet Seeds' catalogue, this strain boasts elite parentage that makes it shine in any grow space. It offers an uncomplicated 8-week life cycle and produces highly rewarding returns. Besides being resinous, flowers are extremely aromatic and potent.

Creamy deliciousness is imminent, thanks to Blueberry Cupcake from Humboldt Seeds. This high-performing specimen separates itself from the pack with outrageous potency, a sweet yet dank flavour, and massive yields. Plus, she’s easy and fast to grow.

(14)

Seeds

£28.41

Orange Sherbet FF (FastBuds) feminized

From the team at FastBuds comes a lightning-fast photoperiod strain that's sure to put even the quickest autoflowers to shame! Taking just 7 weeks to flower, Orange Sherbet FF is a tall, high-yielding, and top-performing strain that's well-suited to any skillset and will flourish in almost any environment. Just provide a decent level of maintenance and upkeep, and you're golden.

Powerful indica energy and a distinctive note of blueberry muffins are just two of the traits portrayed by Purple Punch Auto by FastBuds. The others are heavy yields, 24% THC, 9 weeks from seed to harvest and much, much more! Incredibly enough, this indica-dominant thrives in colder climates too! What's not to love?

(13)

Seeds

£31.00

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A guide to high-THC strains

Are you looking to purchase cannabis seeds with extreme THC levels? Well, you’re about to discover some of the best strains to suit your desires. However, before we introduce you to our superstar weed varieties, we think you’ll find this brief guide helpful for your cultivation endeavours. Below, find out the key benefits of growing strains loaded with THC, and how to raise them.

Benefits of strains with a high THC content

Why do growers choose to cultivate high-THC strains in the first place? Well, part of the answer is quite obvious: they contain more THC! Higher quantities of the psychoactive cannabinoid means it takes less plant material to experience equally potent effects. With weaker varieties, many experienced smokers might need a whole joint to feel suitably high, whereas with a high-THC strain, a single bong hit might suffice. Overall, a stash of high-THC flowers lasts longer. Those with a particularly high tolerance can also use them to make extremely powerful edibles and extracts to really scratch their itch.

Growing cannabis with higher THC levels

You might think that growing high-THC cannabis takes some kind of special approach—but you’d be mistaken. You can grow these plants in the same way as other varieties. Strains high in THC are innately “wired” to churn out much higher quantities of the cannabinoid. However, this doesn’t mean you can get away with taking shortcuts. Ultra-potent plants still depend on powerful lights, high-quality organic nutrients, and a mindful watering schedule to express their full genetic potential.

Buy the best high-THC genetics available

Do you want to use less of your stash every time you get high? Or maybe your favourite strains aren’t hitting like they used to? Well, what are you waiting for? High-THC strains from Zamnesia will take your experience to another level, without demanding any more work in the grow room or garden. To get you started on your journey, here are some of the strongest varieties you can get your hands on:

Bruce Banner 3: Brace yourself for THC levels of 27% and monster yields
Gorilla Glue: This beast contains 26% THC and fruity and earthy terpenes
Banana: Experience tropical vibes and THC levels of 28%
Larry Bird Kush: With a THC content of 26%, this strain will have you giggling
Wedding Cake Automatic: Prepare to enjoy 24% THC after a rapid growing cycle

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* Seeds are sold as souvenirs. Germination of seeds is illegal in many countries. Be informed before you purchase. By purchasing, you are indicating that you have reached the age of majority where you live, and are aware of your local laws. You also waive any liability towards Zamnesia if you act outside your laws.

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