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Top Highest THC Percentage Flowers of 2023

Top Highest THC Percentage Flowers of 2023

February 7, 2023

The high from a 10% THC cannabis strain can sometimes feel far stronger, and vice versa. Our top ten of the highest THC percentage flowers is a list of our favourites high THC strains (and in no particular order).

Strains that consistently deliver the knockout high and enjoyable stone you expect from high THC cultivar. If we have missed your favourite strongest weed strain then please let us know, they might make our next list!

Alien OG Feminized

  • Genetics: Alien Kush x Tahoe OG Kush
  • Type: Indica-dominant
  • THC: 28%
Alien OG feminized
Alien OG feminized

Effects

This heavy-hitter delivers a wonderfully well-balanced mind-and-body high. It feels like the highest THC strain, but the onset is pleasantly gradual. Smoke slowly to avoid a sudden brain blast, though, as 28% THC is nothing to scoff at.

The effect profile begins with a mood boost. There’s a surge of euphoria tinged with psychedelic sensations, ideal for introspection or immersion in compelling art. The physical effects soon take over, leaving you in a blissful and long-lasting body stone.

Flavors

This specimen of the highest THC weed is surprisingly gentle on the palate. The buds exude a mellow aroma of earth, pine needles, and lemon zest. Herbs, oranges, and spices linger on the tongue for hours after your smoking session.

Growing info

Alien OG feminized is a moderately challenging strain with a high harvest potential. It enjoys organic soil, consistent environments, and regular pruning. The plants are compact, flower in nine weeks, and produce seas of trichomes.

Beware of pests, mold, and inclement weather, and consider a tightly controlled grow room or greenhouse. Feed generously and use powerful lights to get the highest THC content from each chunky bud.

Genetics

This highest THC strain is the bud-child of two impressive indica hybrids, Alien Kush and Tahoe OG Kush. Alien OG is robust, resin-rich, and reliably top-notch.

This mind-bending lady borrows its cerebral kick from Alien Kush and its potency from Tahoe OG Kush. Her growth patterns and flavors are quintessentially indica, courtesy of her double Kush genetics.

5 Alive Feminized

  • Genetics: Bubblegum x Orange Juice x Grape Pie
  • Type: Sativa-dominant
  • THC: 29%

Effects

5 Alive makes you come alive from the inside out. It brings an electrifying blend of physical and psychological effects suitable for work, exercise, socialization, and art production. With 29% THC, it promises a fast-acting, heavy-hitting, long-lasting high.

The experience begins with a mood uplift. The boost translates into physical energy, leaving you light on your toes. Unexpectedly, this highest THC strain leaves you clear-headed from beginning to end.

Flavors

This energizer tastes as rejuvenating as it feels. Its bouquet is reminiscent of a tropical fruit salad, dominated by grapefruit, orange, lemon, and lime aromas. A rich earth fragrance underpins the freshness and lingers on the tongue upon the exhale.

Growing info

5 Alive feminized is ideal for first-time sativa cultivators. It’s compact and resistant to pests, climate fluctuations, and rookie errors. Flowering takes ten weeks and produces mid-sized harvests of crystalline, connoisseur-quality buds.

Watch for overfeeding and mold formation to keep your garden healthy. Sow in sunny spots or use supplemental lamps to get the highest THC level from your marijuana. Growers get the best results using organic setups and carefully pruning their plants.

Genetics

5 Alive comes from Grape Pie, Orange Juice, and Bubblegum. All three strains have dessert-tier flavors and happy effects, qualities prominent in their superstar offspring.

Grape Pie’s sugary fragrance comes through in the smoke. Orange Juice freshens the aroma and underpins the uplift with a calm. Bubblegum is responsible for 5 Alive’s high-energy, joyful high, while all three contribute to it being the highest THC weed.

Bruce Banner Feminized

  • Genetics: OG Kush x Strawberry Diesel
  • Type: Sativa-dominant
  • THC: 27%

Effects

How hard does Bruce Banner Feminized strain hit? Well, whatever it does, it does it fast. Instantly euphoric, head-spinning, happy and relaxing. Perfect for those creative types who like to sit at the piano or pen the occasional missive to loved ones in faraway lands, or play GTA on the Playstation, whatever floats your boat.

Medically, it has many applications. It's amazing for aches and pains and superb for depression, a fantastic way to ease the stress and tension of the working week.

Flavors

Bruce Banner plants have an incredible odor, a real superhuman stench, and the flavors are powerful, too. Dank, pungent earth erupts with oily diesel and squashed berries - you’ll certainly know this bad boy when you smell it. Once you hold it under your nostrils it's very hard to put down!

Growing info

While the avengers might use Bruce Banner as their own screen of green, a little experience with scrogging will help get the best out of this plant. It grows tall so an indoor grow will really benefit from the topping and the expansive spread of a well-executed ScrOG.

And don’t worry too much about bending or breaking those limbs. We all know what happens when you rile the good doctor, but when you expose these plants to stress, low or high, the results are astounding: increased yield and bud production and a far stronger plant. When executed correctly, of course.

Genetics

Bruce Banner Feminized is a cross of OG Kush and Strawberry Diesel. It was named after the alter-ego of the Incredible Hulk, doctor Bruce Banner, and it’s easy to see why.

Plant one of these small, innocent-looking seeds and nature will soon deliver a giant, powerful beast of a plant, one with THC levels that can reach a whopping 30%!

Trainwreck Feminized

  • Genetics: Thailand, Mexico and Afghanistan.
  • Type: Sativa-dominant
  • THC: 25%
Trainwreck Feminized

Effects

Her relaxing, almost tranquilizing effects make her a natural, calming sedative and a superb analgesic, perfect for relieving seizures, spasms, fibromyalgia and chronic pain. She’s also a great help to those fighting depression and anxiety.

Trainwreck Feminized delivers a happy, joyous, blissful high but her energy is felt more through the mind than the body. Once you are used to the potency, she’s an excellent partner for creative pursuits, a real fire for the imagination. If you can’t, she’ll simply lock you to the couch and whisper peacefully into grateful ears.

If you need a wonderful medicine from an easy to grow plant, you have definitely found it here.

Flavors

Sweet, tangy lemon and pungent pine, hints of spice and moist earth, you’ll be itching to blaze this baby up. And when you do, that sharp citrus will linger on the tongue and tease those tastebuds for hours.

Growing info

For inexperienced cultivators, growing your own Trainwreck Feminized seeds is a fantastic choice. She’s genetically stable, she flourishes indoors and out, and she delivers heavy yields with minimum stretch. You’ll need to temper her spread with a little trimming, keeping her dry and away from frost, but this basic maintenance is all she’ll really need.

Flowering should last around 9 weeks, no more then 10, and you’ll be set to dry some fine-smelling flower.

Genetics

Trainwreck was created in sunny California, using a combination of genetics from as far away as Thailand, Mexico and Afghanistan. It’s a sativa-dominant plant but has an indica-dominant high, much more of a night-time smoke than the genetic split suggests.

Green Crack Feminized

  • Genetics: Skunk #1 x unknown indica
  • Type: Sativa-dominant
  • THC: 20%
Green Crack Feminized

Effects

If you’re looking for a strain that boosts creativity, that inspires, that will be Focus, Spark and Muse, you’ve found it in Green Crack Feminized. The high is as energizing as it is euphoric. When you’ve painted your masterpiece and cleaned the house from top to bottom, you’ll be left happy, relaxed and totally free of care.

Patients love Green Crack, especially those with mental fatigue, depression and stress. A balanced dose is great for anxiety, and she’s been used effectively to combat aches, pains and cramps.

With 20% THC she isn’t the most potent in the list, but, given the right mood, she can feel more like a thirty.

Flavors

You can also look forward to a grow room full of forest fruits, vanilla, mango and incense. Beautiful, multi-layered aromas that hint at the deeply complex flavors of the dried bud. She’s as pleasurable on the nose as she is on the palate. And she packs a pleasing punch, too!

Growing info

She performs incredibly well both indoors and outside, and is an easy challenge for all but the greenest of growers. She grows very quickly during veg and will flower in just 8 weeks, so keep her supported and keep her fed. When you grow your own Green Crack successfully, you’ll see medium to heavy yields over several annual harvests.

Genetics

Green Crack Feminized has grown beyond its controversial name to become one of the world’s favorite strains. It’s a cross of Skunk #1 and an unknown, Californian Indica.

Zkittlez Feminized

  • Genetics: Grape Ape x Grapefruit
  • Type: Indica-dominant
  • THC: 21%
Zkittlez Feminized

Effects

Her relaxing and euphoric qualities are only half the story. There’s a clear-headedness and clarity of creative thought that can only come from her sativa side. Friendly, inspirational… and with a THC level of 21%, Zkittlez Feminized is one of our favorite all-time out of the highest THC percentage flower.

She relieves nausea and many patients use her moderate nature to combat stress, anxiety and depression.

Flavors

Once you have this baby in mason jars, the real pleasure’s about to begin. She inherits exceptional aromas from her grapy parents, with luscious notes of lemon, lime and pineapple enhancing dominant tones of grape.

Blazing her up only improves these flavors. The smoke seems to blush with fluffy candy: sweet, mouthwatering and seductive. While the taste is pretty intense, the high is fairly gentle.

Growing info

Growing your own Zkittlez seeds is a great choice if you’re just starting out in your cultivation career. She won’t take more than 8 weeks in flower but her yield is always nice and heavy. As with most indica-dominant plants, you’ll have to monitor humidity to avoid natural molds. Keep the canopy well-ventilated, thinning and trimming where you can. She’ll thank you for it later.

Creating more bud sites will also work in your favor. If you want to experiment with Supercropping, you won’t find a more willing and able subject. Zkittlez is a hardy, vigorous hybrid and will forgive all but the most catastrophic of mistakes.

Genetics

Zkittlez Feminized is a multiple cup-winning cultivar with a lineage that includes Grape Ape and Grapefruit. She has a wealth of interesting, fruity flavors and an extremely entertaining high. She is also very easy to grow.

One of the most enjoyable things about growing your own Zkittlez is the colors. Her dense nuggets are a nebula of starry trichomes. They glisten among dark plum fan leaves, shot through with bright veins of electric lime. Put it this way, for those who like a good photo - your Instagram account is about to explode!

Gorilla Glue #4 Feminized

  • Genetics: Chem’s Sister x Sour Dubb x Chocolate Diesel
  • Type: Hybrid
  • THC: 27%
Gorilla Glue #4 Feminized

Effects

The high is positive, uplifting, really talkative, and boy, it will help you sleep once you hit the right dose. Gorilla Glue #4 Feminized is a potent strain and well-deserving of its place in this list.

Flavors

It has a wonderful color and it’s covered in crystals, and it has quite a distinctive nose. Super-earthy and really dank but with hints of coffee, chocolate... and man, you can almost smell the stickiness. And the taste? We have diesel, lemon, plenty of pine... (no wonder it’s won so many awards).

Growing info

When you grow your own Gorilla Glue #4 Feminized seeds you're looking at around 9 weeks in flower and heavy yields. Indoor grows will need 600W lights and you’ll want to keep the temperature between 69 to 79 degrees Fahrenheit, that’s about 21 to 26 degrees Celsius for our European friends out there.

When flowering's nearly done, lower the temperature by a few degrees and you might see an awesome explosion of trichomes. And what about THC? How strong is this strain? Well, Gorilla Glue #4 has measured THC levels of a staggering 27%.

If that’s not enough to float your boats, I don’t know what is.

Genetics

This is a hybrid with an impressive pedigree. Its parents include Chem’s Sister, Sour Dubb and Chocolate Diesel, but this baby’s outdone them all. We are talking, of course, about the gloriously glutinous, the voraciously viscous, the sweet, sticky and syrupy superstar that is, Gorilla Glue #4.

Gorilla Glue #4 is a gorgeous looking plant. Colas like tree trunks, buds the size of bowling balls, and the stickiness, wow, if Gorilla Glue was a book you’d never put it down.

Fire OG Feminized

  • Genetics: OG Kush X San Fernando Valley OG Kush
  • Type: Indica-dominant
  • THC: 23%
Fire OG Feminized

Effects

Her sensual beauty masks an extremely weighty, powerful high. Fire OG Feminized has a variety of medicinal applications but is best known for killing pain and curing insomnia. As a sedative, she has few equals. As a relaxing, euphoric, and incredibly chilled-out strain, she has none.

This plant is perfect for those who wish to challenge their growing skills while enjoying some seriously soothing weed.

Flavors

She boasts a delightful flavor profile of sharp citrus and tangy earth. A warm breeze drifting through lemon trees. Mediterranean summers and ancient blue skies. She floods the mouth as she fills the air.

Growing Info

But what is it like to grow your own Fire OG Feminized seeds? Not great news for beginners, I’m afraid. She can be an awkward, sensitive plant, one that really needs an experienced hand. Her feeding needs to be well-planned and responsive. A little rain can leave her vulnerable to mold. She will also need lots of pruning, topping and general maintenance.

She’ll deliver high yields of amazing quality when grown right, but expect to be pretty busy until you’re closing up the jars.

If you’re up for the challenge, if you succeed with Fire OG, you’re in for a real treat.

Genetics

This strain is heavy-hitting, extremely tasty and a genuine 420 favorite. A cross of OG Kush and San Fernando Valley OG Kush, Fire OG gets her name from the flaming red hairs that curl from her dense, diamond-flecked nugs. Her great looks might make it love at first sight, but the sheer power of this weed will bring you back for more. Again and again and again.

Grandaddy Purple Feminized

  • Genetics: Big Bud X Purple Urkle
  • Type: Indica-dominant
  • THC: 22%
Grandaddy Purple Feminized

Effects

There is nothing sharp about Grandaddy Purple Feminized effects. Bathe your entire body in a warm, tranquil ocean and you still won't get close to this high. GDP is a relaxation sensation! The mind and body are soothed in tandem. Euphoric thoughts complement the easing of physical tension. You won’t find a better way to chill after a hard day’s work.

Also, I recommend taking a look at Cafe Racer, a cool hybrid of Grandaddy Purple and GSC with over 25% of THC. Cafe Racer is superb for pain, insomnia, stress, cramps, spasms and much more. She is an effective panacea and must-have for any serious medicine drawer.

Flavors

The plant’s aroma of sweet fruit and crushed grape is pure joy, while the flavor profile of the dried flower takes on magical notes of pine and added sharpness.

Growing info

Grandaddy Purple Feminized is disease-resistant, she won’t mind a bit of cold and any mold or mildew worries can be put to bed with simple trimming, airing and humidity control. Once you’ve grown your own, you get to smoke your own, and with Grand Daddy Purple, you’re heading straight to seventh heaven.

Genetics

This high THC strain is a mostly indica strain developed in California, one famous for its stunning plum and pomegranate colours and deliciously complex weed flavors. It was created by Ken Estes back in 2003, and has since spawned many fascinating hybrids. We are talking, of course, about the Big Bud and Purple Urkle cross that is, Grandaddy Purple.

Grand Daddy Purple, or GDP for short, inherited her deep iridescence and sweet berry aroma from the Urkle, while the dense, bloated, resin-soaked nugs and heavy yields are typical of Big Bud. She’s a quick-flowering and beautiful plant, a beginner’s dream.

Chemdawg #4 Feminized

  • Genetics: Chemdawg x Green Crack
  • Type: Indica-dominant
  • THC: 24%
Chemdawg #4 Feminized

Effects

This sharpness of flavor is mirrored in her high. Chemdawg #4 Feminized is a nimble analgesic with an intense, almost psychedelic buzz, thoroughly enjoyable and brilliantly energizing. She’s perfect for creative brainstorming or for really exploring your favorite tunes.

There are few strains better at killing pain without draining the batteries. And like most of the Chemdawg family, a well-managed dose works well against depression and stress.

It is strong, it is reliable, and it’s a great way to get your mitts on some top-drawer American genetics. High-THC cannabis at its best.

Flavors

She smells and tastes great. Gorgeously chemmy with strong notes of lemon, pine, floor cleaner and kerosene. A little like a New York Diesel but less oily, she has much more of an edge.

Growing info

There are few plants as attractive as Chemdawg #4. Dark, thinly-mottled leaves enhance her glittering blankets of trichomes, creating a vision of real depth. The nicely-spaced buds and narrow, sativa-style blades allow for extra ventilation and more access to light, creating a tall, healthy-looking plant that grows with amazing vigor.

Genetics

Chemdawg #4 Feminized is a rarity among the distinguished line of Chemdawg strains, being indica-dominant and very fast-acting. She’s a cross of a classic Chemdawg and a Skunky Green Crack, and has inherited some amazing traits from both.

White Widow Feminized

  • Genetics: Brazilian Sativa x Manga Rosa
  • Type: Indica-dominant
  • THC: 25%
White Widow Feminized

Effects

The high is as creative as it is euphoric. The medical potential of White Widow Feminized is enormous, and it has already been shown to ease anxiety, depression, pain and stress. It is one of nature’s miracles and a genuine classic.

Flavors

The taste and aroma share an unmistakable pungency. Earthy fruit, shaved wood, sharp spices and delicate herbs combine to really please the palate.

Growing info

When you grow your own White Widow Feminized seeds, you will experience what an excellent pairing these parents have made. She is easy to grow, especially indoors using screen of green, and will deliver medium yields without too much stretch.

A little pruning below the screen, plenty of nitrogen while in veg and extra phosphorous in flower will see you right. An outdoor grow will see the difficulty level rise as she is a fussy eater and quite sensitive to climate. But with skill and a little luck the outdoor yield will be bigger, the nugs will be denser and the flavors far richer.

Genetics

The creation of master breeder, Shantibaba, White Widow is the offspring of a Brazilian Sativa and a hybrid from Kerala in southern India. The mother plant was probably Manga Rosa, an old Brazilian landrace. Shantibaba himself discovered the Keralan father, an ancient indica hybrid selected over many generations for its power and resin production.

San Fernando Valley Kush Feminized

  • Genetics: San Fernando Valley OG x Afghan
  • Type: Indica-dominant
  • THC: 22%
San Fernando Valley OG Kush Feminized

Effects

When this Kush hits you, you stay hit. And it hits you with the first drag. San Fernando Valley Kush Feminized can be in turns couch-locky, expansive, trippy and drowsy. It is not for newbies but for those seasoned tokers out there, you’re in for a treat. High-THC marijuana at its finest.

Flavors

San Fernando Valley Kush has an aroma best described as old-school. It is dank, it is earthy, it has a piercing, piney tang, it takes you straight back to tie-dyed t-shirts and Woodstock. Mud, drugs and ladybugs. And if the scents don’t take you there, the high certainly will.

Genetics

Let’s talk about San Fernando Valley Kush, not San Fernando Valley OG, but San Fernando Valley Kush… there is a difference. San Fernando Valley Kush is actually a San Fernando Valley OG crossed with an Afghani male. Not confusing at all, right?

Growing info

Okay, nonsensical nomenclature aside, this plant is the bomb. It isn’t strictly suitable if you are growing your own as a beginner, but a little guidance from our team should see you right. Grow her indoors and you’ll want to use good, organic soil with plenty of nutrients.

Using reverse osmosis watering techniques and keeping the pH between 6 and 6.5 should see medium yields after just 8 weeks of flowering. An outdoor crop will need a Mediterranean climate or warmer as this baby loves the sun.

Where to find the highest THC strains

Whatever strain you choose to pick from these awesome highest THC percentage flowers, keep in mind that "strong" doesn't always mean "top-shelf". Make sure to get yours from the best seedbank on the market!

With over 20 years of experience in the cannabis industry, we have the grow-how from the experts! We deliver high-quality, fast-germinating seeds with impeccable and stabilized genetics swiftly and discreetly worldwide at a competitive price.

To keep learning about THC levels, read our article about "what is considered high THC".


About the author: Parker Curtis

Parker Curtis has around a decade of cannabis-growing experience, specialising in soil-less and hydro grows. He’s mastering outdoor, greenhouse, and indoor grows.

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