High THC Strains

• Original Sensible Seeds
• Ace Seeds
• Anesia Seeds
• Barneys Farm Seeds
• Fast Buds Seeds
• Growers Choice
• Humboldt Seed Company
• Humboldt Seed Organization
• Kannabia Seeds
• Pyramid Seeds

• Auto Flowering
• Normal

• 10% - 20%
• Over 20%

• 350 - 500 Grams
• Over 500 Grams

• Under 80cm
• 80cm - 100cm
• Over 100cm

• Under 60 Days
• 60 -70 Days

Best Selling High THC Strains

1

Alien Moonrocks

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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2

Bruce Banner 3

Pack Sizes: 1,3,5,10,25

PRICES FROM: $12.18

FROM: $12.18

THC %: 28.00

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3

GG 4 Original Glue

Pack Sizes: 1,3,5,10,25

PRICES FROM: $12.18

FROM: $12.18

THC %: 28.00

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4

Original Oreoz

Pack Sizes: 5,10,15,20,25,30,35

PRICES FROM: $23.59

FROM: $23.59

THC %: 30.00

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5

Blue Zushi

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 30.00

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6

Frosted Guava

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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7

Pink Rozay

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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8

Tutankhamon

Pack Sizes: 1,3,5,50,100

PRICES FROM: $8.57

FROM: $8.57

THC %: 33.00

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9

Pellezino Cookies

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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10

Black Orchid

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 30.00

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11

IMPERIUM X

Pack Sizes: 3,5,10,20,30,40,50,60

PRICES FROM: $35.56

FROM: $35.56

THC %: 36.00

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12

Pink Rozay x Strawberry Banana Auto

Pack Sizes: 1,3,5,10,25

PRICES FROM: $8.51

FROM: $8.51

THC %: 23.00

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13

Wedding Cake Auto

Pack Sizes: 1,3,5,10,25

PRICES FROM: $9.76

FROM: $9.76

THC %: 20.00

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14

Peanut Butter Fast

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 25.00

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15

Runtz Gum

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 28.00

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16

Strawberry Pie Auto

Pack Sizes: 1,3,5,10,25

PRICES FROM: $8.24

FROM: $8.24

THC %: 23.00

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17

Apple Fritter Auto

Pack Sizes: 1,3,5,10,25

PRICES FROM: $8.51

FROM: $8.51

THC %: 23.00

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18

The Sin

Pack Sizes: 3,5,10,20,30,40,50,60

PRICES FROM: $46.79

FROM: $46.79

THC %: 38.00

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19

Future #1

Pack Sizes: 3,5,10,20,30,40,50,60

PRICES FROM: $50.80

FROM: $50.80

THC %: 37.00

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20

Epic Buzz

Pack Sizes: 3,5,10,20,30,40,50,60

PRICES FROM: $54.12

FROM: $54.12

THC %: 36.50

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21

High Mars

Pack Sizes: 1,3,5,10,20,30,40,50,60

PRICES FROM: $49.45

FROM: $49.45

THC %: 36.00

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22

Future Island

Pack Sizes: 3,5,10,20,30,40,50,60

PRICES FROM: $48.78

FROM: $48.78

THC %: 34.00

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23

Sherbet Moonrocks

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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24

Jungle Lava

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 33.00

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25

Killer A5 Haze

Pack Sizes: 1,3,5

PRICES FROM: $22.05

FROM: $22.05

THC %: 30.00

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26

Notorious THC

Pack Sizes: 5,10,20,30,40,50,60

PRICES FROM: $60.65

FROM: $60.65

THC %: 30.00

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27

Strawberry Cheesecake

Pack Sizes: 5,10,15,20,25,30,35

PRICES FROM: $60.65

FROM: $60.65

THC %: 30.00

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28

Trop Cherry

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 30.00

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29

Jealousy

Pack Sizes: 1,3,5,10,25

PRICES FROM: $10.96

FROM: $10.96

THC %: 30.00

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High THC cannabis seeds FAQs

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• Where can I buy high THC strains?

• You can buy high THC cannabis seeds online at Original Seeds Store, where we stock the strongest marijuana strains from top seed banks including Barney’s Farm, Anesia Seeds, Growers Choice, Humboldt Seeds, Original Sensible Seeds and many more.
  
  This section includes the Top 30 strongest cannabis strains available today – many bred from original USA genetics known for their sky-high THC content. We ship worldwide with fast, discreet delivery to the UK, USA, Canada, Europe, Australia, and beyond.

• What is the strongest THC strain?

• Some of the highest THC strains in the world come from elite American breeders using Cali genetics. Notable examples include:
  
      The Notorious THC by Humboldt Seeds
  
    Bruce Banner #3 by Original Sensible Seeds
  
      The Sin by Anesia Seeds
  
  All of these strains boast THC levels above 30% and deliver intense effects.
  
  One of our long-time bestsellers is Tutankhamon (aka King Tut) from Pyramid Seeds – bred from AK genetics, it's consistently rated among the most potent weed seeds on the market.

• What are best high THC feminised strains?

• Our High THC cannabis seed collection features only the strongest feminised seeds from world-renowned breeders. These strains are:
  
      100% female plants, so no males to worry about
  
      Easy to grow, even for beginners
  
      Packed with potency, flavour, and bag appeal
  
  Top feminised high THC strains include:
  
      Runtz Muffin by Barney’s Farm
  
      Banana Sherbet by Original Sensible Seeds
  
      Alien Moonrocks by Original Sensible Seeds

   

• Which high THC seeds do you recommend?

• Which high THC seeds do you recommend?
  
  It depends on your growing experience and setup:
  
  For beginners:
  
  Try autoflowering high THC strains like:
  
     Quick One Auto
  
     Northern Light Auto
  
     Bruce Banner Auto
  
  These are easy to grow, fast to harvest, and still deliver potent effects.
  
  For experienced growers:
  
  We recommend Alien Moonrocks – a powerhouse with THC levels that’ll send you into orbit. Great for photoperiod indoor or outdoor grows where you can maximise yield and strength.

• Do cannabis seeds contain THC?

• No – raw cannabis seeds do not contain THC. THC is produced only during the plant’s growth and flowering stages, once buds begin to mature. The final THC content of your harvest depends on:
  
   Genetic potential (strain selection)
  
  Growing conditions (light, nutrients, etc.)
  
  Drying and curing process
  
  To achieve high-THC marijuana, you need to grow out the full cycle and properly cure your buds.

• Do high THC seeds germinate well?

• Do high THC seeds germinate well?
  
  Yes – high THC seeds from trusted breeders have high germination rates when stored and handled correctly. At Original Seeds Store, we only stock fresh, viable seeds from reputable seedbanks.
  
  Pro tip: Use the paper towel method or starter plugs and maintain a germination temperature of 22–25°C (72–77°F) for best results.

• Are high THC strains good for making concentrates?

• Absolutely. If you're into rosin, shatter, live resin, or THC oil, you’ll want strains with 30%+ THC potential and high resin production. Popular strains for extraction include:
  
  Gorilla Glue #4 – ultra sticky and potent
  
  Banana Sherbet – rich terpene profile
  
  Strawberry Cheesecake – high trichome content and yield
  
      These strains offer high yields of THC-rich resin, perfect for home extractors.

• Are high THC seeds legal to buy in the UK?

• Yes – in the UK, cannabis seeds are legal to buy and own as collector’s items or souvenirs. They cannot be germinated unless local laws permit cultivation. We ship discreetly and securely to all parts of the UK, with stealth packaging and free tracked delivery.

• Can I buy high THC seeds in the USA?

• Yes – we ship high THC cannabis seeds discreetly to the USA, with tracking and stealth shipping. Many of the top strains in our collection are bred from American genetics, so if you're in the US, you can grow local legends like:
  
      Bruce Banner
  
      Girl Scout Cookies
  
      Runtz

• What’s the difference between THC and CBD strains?

• THC (tetrahydrocannabinol) and CBD (cannabidiol) are the two most well-known cannabinoids found in cannabis. THC strains are psychoactive and deliver the classic “high,” while CBD strains are non-intoxicating and often used for therapeutic effects like pain relief and anxiety reduction.
  
  If you're looking for potent effects, choose high THC weed strains. If you want milder, non-psychoactive benefits, opt for high-CBD cannabis seeds.

• What makes a cannabis strain high in THC?

• 
  A cannabis strain's THC content is primarily determined by its genetic makeup. Breeders selectively cross strains with high resin production and cannabinoid concentration to achieve THC levels over 25%, even pushing 30%+ in some modern hybrids.
  
  Environmental factors like lighting, feeding, and harvest timing can also impact the final THC output – but genetics is key.

• Can I increase THC levels when growing?

• Yes! While genetics set the upper limit, several growing techniques can help you maximise THC production:
  
      Use high-intensity full-spectrum lighting
  
      Implement low-stress training (LST) or defoliation for light penetration
  
      Harvest at peak trichome maturity (milky/amber)
  
      Maintain optimal temperature and humidity
  
  These methods can boost resin production and potency, especially in high THC photoperiod strains.

• What are the top 5 strongest cannabis strains in 2025?

• Here are our top picks for strongest THC strains this year – based on customer reviews, lab data, and breeder reports:
  
  The Notorious THC – Humboldt Seeds (30%+)
  
  Bruce Banner #3 – Original Sensible Seeds (up to 29%)
  
  Alien Moonrocks – Original Sensible Seeds (insane resin and punch)
  
  Cherry Poppers – Barney’s Farm (extremely potent 31%)
  
  Tutankhamon (King Tut) – Pyramid Seeds (AK lineage, legendary)
  
  These strains are all featured in our High THC collection and suitable for growers chasing maximum potency in 2025.

• Which high THC strains are best for outdoor growing?

• Some high THC strains perform exceptionally well outdoors, especially in warm, sunny climates. Our top outdoor THC-rich picks include:
  
      Royal Critical – Fast and mould-resistant
  
      Girl Scout Cookies – Californian legend with potency and aroma
  
      HulkBerry – A beast outdoors with heavy resin
  
    Gorilla Glue Auto – Strong and sticky, great for stealthy outdoor grows
  
  Look for resilient genetics, short flowering times, and mould resistance when choosing high THC strains for outdoor cultivation.
     

• Are high THC strains good for medical use?

• Yes – many medical users prefer high THC strains for conditions like chronic pain, appetite loss, insomnia, and depression. While CBD is often highlighted in medical cannabis, THC has powerful therapeutic effects, especially in managing discomfort and mood.
  
  Strains like Gorilla Glue, Banana Sherbet, and Bruce Banner are popular with patients seeking high-strength relief.
  
  

• Are high THC strains suitable for beginners?

• Some are – especially autoflowering high THC strains and fast feminised varieties that are easy to manage and still pack a punch. Beginner growers should start with strains like:
  
     Quick One Auto
  
     Northern Light Fast
  
      White Widow Auto
  
  These offer great potency with forgiving grow cycles. If you're new to cultivation but want strong results, stick to easy-to-grow autos or shorter photoperiod indicas.