Posted on

weed seeds highest thc

High THC

707 Truthband by Emerald Mountain Feminised Seeds

Starting at: £ 74.99

710 Mango Feminised Seeds

Starting at: £ 17.99

8 Miles High Regular Seeds

Starting at: £ 34.99

A-Train Feminised Seeds

Starting at: £ 34.99

Acid Dawg Regular Seeds

Starting at: £ 69.99

Afghan Kush (Pure Origin Collection) Feminised Seeds

Starting at: £ 19.99

Afghan Kush (Pure Origin Collection) Regular Seeds

Starting at: £ 19.99

Afghan Kush Early Harvest (Pure Origins Collection) Feminised Seeds

Starting at: £ 19.99

Afghan Kush Ryder Autoflowering Feminised Seeds

Starting at: £ 22.99

Afghan Kush Special (Legend Collection) Feminised Seeds

Starting at: £ 29.99

Afghanica Feminised Seeds

Starting at: £ 34.99

After 8 OG Feminised Seeds

Starting at: £ 24.99

AK 49 Feminised Seeds

Starting at: £ 14.99

AK420 Autoflower Feminised Seeds

Starting at: £ 6.99

AK420 Feminised Seeds

Starting at: £ 6.99

Alchemy Regular Seeds

Starting at: £ 64.99

Alien Gorilla Feminised Seeds

Starting at: £ 41.99

Alien Gorilla Feminised Seeds

Starting at: £ 21.99

Alien Masster Kush Feminised Seeds

Starting at: £ 23.99

Shop By Price

Shop By Seed Bank

  1. 00 Seeds Bank (4)
  2. 710 Genetics (1)
  3. Ace Seeds (12)
  4. Advanced Seeds (23)
  5. Anesia Seeds (55)
  6. Archive Seedbank (9)
  7. Auto Seeds (2)
  8. Barney’s Farm (36)
  9. BC Bud Depot (10)
  10. Big Head Seeds (45)
  11. Big Monster Seeds (1)
  12. BlackSkull Seeds (9)
  13. BlimBurn Seeds (19)
  14. Bomb Seeds (13)
  15. Cali Connection (3)
  16. Cannarado Genetics (15)
  17. Concrete Jungle (1)
  18. Connoisseur Genetics (1)
  19. Cream of the Crop (11)
  20. Critical Mass Collective (16)
  21. Crockett Family Farms (10)
  22. Dank Genetics (7)
  23. DankHunters Seed Co (2)
  24. Dankonomics (1)
  25. Dark Horse Genetics (23)
  26. De Sjamaan Seeds (5)
  27. Delicious Seeds (36)
  28. Devil’s Harvest (17)
  29. Dinafem (5)
  30. DNA Genetics (3)
  31. Don Avalanche Seeds (28)
  32. Dr Krippling (17)
  33. Dr Underground (1)
  34. Dragon Seeds (4)
  35. Dready Seeds (1)
  36. Dutch Passion (13)
  37. Elev8 Seeds (27)
  38. Emerald Mountain Legacy (9)
  39. Eva Seeds (3)
  40. Exotic Seed (4)
  41. Expert Seeds (26)
  42. Fast Buds (49)
  43. Female Seeds (1)
  44. Feminised Seeds (1)
  45. G13 Labs (6)
  46. Genehtik Seeds (2)
  47. GG Strains (3)
  48. Grand Daddy Purp (5)
  49. Grateful Seeds (10)
  50. Green House Seed Co (20)
  51. Grounded Genetics (6)
  52. GrowersChoice (47)
  53. Heavyweight Seeds (19)
  54. Hella Seed Co. (2)
  55. Holy Smoke Seeds (20)
  56. House of The Great Gardener (5)
  57. Humboldt Seed Company (7)
  58. Humboldt Seed Org (4)
  59. Kannabia (8)
  60. Karma Genetics (26)
  61. Katsu Bluebird Seeds (5)
  62. Kera Seeds (14)
  63. Kush Cannabis Seeds (3)
  64. Lady Sativa Genetics (1)
  65. LaMota Seeds (2)
  66. Little Chief Collabs (2)
  67. Mandala Seeds (9)
  68. Medical Seeds (5)
  69. Medicann (21)
  70. Mega Buds (4)
  71. Ministry of Cannabis (8)
  72. Monster Genetics (10)
  73. Mosca Seeds (7)
  74. Nirvana Seeds (3)
  75. Old School Genetics (5)
  76. Original Sensible Seeds (29)
  77. Pakalolo Seed (2)
  78. Paradise Seeds (2)
  79. Penthouse Cannabis Co (12)
  80. Perfect Tree Seeds (15)
  81. Pheno Finder Seeds (4)
  82. Philosophers Seeds (6)
  83. Positronics (9)
  84. Pot Valley Seeds (11)
  85. Prolific Coast Seeds (2)
  86. Pyramid Seeds (27)
  87. R-KIEM Seeds (7)
  88. Rare Dankness Seeds (7)
  89. Reserva Privada (1)
  90. Ripper Seeds (1)
  91. Rockwell Seeds (3)
  92. Royal Queen Seeds (32)
  93. Samsara Seeds (9)
  94. Seed Stockers (64)
  95. Seedsman Seeds (11)
  96. Seeds of Life (1)
  97. Sensi Seeds (6)
  98. Serious Seeds (1)
  99. Short Stuff (4)
  100. Soma Seeds (3)
  101. Spitfire Genetics (7)
  102. Subcool’s The Dank (aka TGA Seeds) (7)
  103. Sumo Seeds (9)
  104. Super Sativa Seed Club (18)
  105. Super Strains (7)
  106. Sweet Seeds (2)
  107. TastebudzSeeds (18)
  108. TerpHogZ GeneticZ (5)
  109. TH Seeds (17)
  110. The Plug Seedbank (8)
  111. Top Shelf Elite (13)
  112. True Canna Genetics (3)
  113. Ultra Genetics (3)
  114. Vision Seeds (17)
  115. White Label Seed Co (4)
  116. World Of Seeds (21)
  117. Yieldmonger (9)
  118. Zambeza Seeds (1)

Shop By Seed Type

  1. Feminised (1074)
  2. Regular (238)

Shop By Flowering Type

  1. Photoperiod (1073)
  2. Autoflowering (246)

Shop By Type

  1. Pure Indica (40)
  2. Mostly Indica (451)
  3. Indica / Sativa (353)
  4. Mostly Sativa (328)
  5. Pure Sativa (20)

Shop By Flowering Time

  1. Up to 7 weeks (18)
  2. 7 to 9 weeks (677)
  3. 9 to 11 weeks (506)
  4. 11+ weeks (67)

Shop By Yield

  1. Average (39)
  2. Above Average (382)
  3. Large (541)
  4. Very Large (147)

Shop By THC

  1. High (8)
  2. Very High (1009)

Shop By CBD

  1. Low (195)
  2. Medium (30)
  3. High (4)
  4. Very High (2)

Shop By Height

  1. Small (124)
  2. Medium (464)
  3. Tall (114)

Shop By Where to Grow

  1. Indoor (12)
  2. Indoor / Outdoor (1281)
  3. Outdoor (11)

Shop By Pack Size

  1. 1 Seed (54)
  2. 2 Seeds (2)
  3. 3 Seeds (663)
  4. 4 Seeds (2)
  5. 5 Seeds (859)
  6. 6 Seeds (122)
  7. 7 Seeds (35)
  8. 8 Seeds (12)
  9. 9 Seeds (14)
  10. 10 Seeds (665)
  11. 11 Seeds (13)
  12. 12 Seeds (147)
  13. 15 Seeds (3)
  14. 20 Seeds (2)
  15. 24 Seeds (5)
  16. 25 Seeds (57)

Shop By Stock

  1. In Stock (951)
  2. Out of Stock (355)

Shop By New Arrivals

You have no items to compare.

Cannabis Seeds
New & Popular
Top Breeders
Contact

+44 (0)113 245 7847

Unit 1, Dolly Lane

Mon – Fri: 10am – 5pm

Saturday: 10am – 2pm

Welcome to SeedMadness

SeedMadness is the place for the freshest and finest cannabis seeds. With over 2500 strains from the top cannabis seedbanks and specialised premises OPEN TO THE GENERAL PUBLIC, you know you can trust SeedMadness for your weed seeds.

Our large stock includes many Cannabis Cup Winners & seeds from the most popular seed banks.

Join Now

Subscribe to our newsletter to receive updates on new promos and strains straight to your mailbox.
You will also get 10% coupon code for your next order.

High THC Cannabis Seeds

This is marijuana you will feel. High THC cannabis seeds, in all kinds of varieties. Super strong haze, skunk or kush cannabis seeds can be found in this special category. Choose from Barney’s Farm, Royal Queen Seeds, Greenhouse Seeds or Dutch-Headshop house brand weed seeds for super strong THC weed. Check the THC content of all weed strains and choose the strongest weed. These are also the best strains for making THC oil. In this category you will find all weed seeds with a THC percentage of 17% or higher. In other words: all the powerhouses in one place.

Do you find it difficult to make a choice? Use our Cannabis Seed Wizard on this page; the interactive decision aid for the best cannabis seeds that suit your needs.

  1. Amsterdam Genetics (19)
  2. Barney’s Farm (23)
  3. Dutch Passion (15)
  4. Dutch-Headshop (37)
  5. Grass ‘O Matic (1)
  6. Greenhouse Seeds (19)
  7. Humboldt Seeds (1)
  8. Paradise Seeds (20)
  9. Positronics (3)
  10. Royal Queen Seeds (14)
  11. Strain Hunters (2)
  1. 1 (32)
  2. 7 (6)
  3. 2 (1)
  4. 3 (121)
  5. 5 (105)
  6. 5 (11)
  1. Autoflower and Feminised (56)
  2. Feminised (97)
  3. Regular (not feminized) (1)
  1. Beginners (82)
  2. Average (69)
  3. Green Thumb (4)
  1. Strong smell (100)
  2. Mild smell (52)
  3. Little smell (3)
  1. Mix (4)
  2. Pure Indica (2)
  3. Indica Dominant (78)
  4. 50/50 Sativa/Indica (18)
  5. Sativa Dominant (49)
  6. Pure Sativa (3)
  1. Mix (4)
  2. 6 weeks or shorter (7)
  3. 7-8 weeks (61)
  4. 9-10 weeks (76)
  5. 11-12 weeks (4)
  6. 13 weeks or longer (1)
  7. Unknown (1)
  1. 10-11 weeks (33)
  2. 12 weeks or langer (8)
  3. 6-7 weeks (2)
  4. 8-9 weeks (11)
  5. Mix (4)
  6. N/A – Non-autoflowering (97)
  1. Unknown (5)
  2. Skunk (13)
  3. Cheese (3)
  4. Afghan (2)
  5. USA (33)
  6. Diesel (4)
  7. Kush (22)
  8. Haze (20)
  9. Blue (7)
  10. Purple (6)
  11. White (9)
  12. Mix (28)
  13. Landrace (2)
  1. Indoor, outdoor and greenhouse (150)
  2. Outdoor (2)
  3. Indoor and greenhouse (3)
  1. End of October (9)
  2. End of September (18)
  3. Halfway through October (39)
  4. May to August (Autoflower) (58)
  5. Start of November (1)
  6. Start of October (31)
  7. Unknown (3)
  1. Miscellaneous (4)
  2. 50-100 cm (65)
  3. 100-150 cm (61)
  4. 150-200 cm (22)
  5. 200-300 cm (5)
  6. Unknown (2)
  1. Banana (3)
  2. Berries (17)
  3. Bubblegum (2)
  4. Cheese (3)
  5. Chemical (2)
  6. Chocolate (8)
  7. Citrus (43)
  8. Coffee (1)
  9. Complex (3)
  10. Diesel (14)
  11. Earthy (50)
  12. Flowers (15)
  13. Fruity (53)
  14. Garlic (1)
  15. Grape (3)
  16. Grapefruit (1)
  17. Hashish (8)
  18. Honey (1)
  19. Lavender (1)
  20. Lemon (23)
  21. Lime (8)
  22. Liquorice (1)
  23. Mango (5)
  24. Menthol (1)
  25. Metal (1)
  26. Mint (6)
  27. Miscellaneous (2)
  28. Nutty (4)
  29. Onion (2)
  30. Orange (2)
  31. Pepper (4)
  32. Pine (21)
  33. Pineapple (3)
  34. Plum (1)
  35. Pungent (6)
  36. Savoury (24)
  37. Skunk (7)
  38. Spicy (10)
  39. Strawberry (5)
  40. Sweet (68)
  41. Tropical (7)
  42. Vanilla (3)
  43. Woody (5)
  1. THCV (1)
  2. CBG (19)
  3. CBN (7)
  1. Daytime (69)
  2. Evening (91)
  3. Motivating (50)
  4. Good Night Sleep (40)
  5. Get Creative (28)
  6. Socialize (29)
  1. Appetizing (5)
  2. Cheerful (52)
  3. Couch-Lock (13)
  4. Dreamy (5)
  5. Energetic (32)
  6. Euforic (42)
  7. High (33)
  8. Lucid (11)
  9. Medicinal (8)
  10. Meditative (4)
  11. Miscellaneous (1)
  12. Narcotic (6)
  13. Psychedelic (9)
  14. Relaxing (71)
  15. Sedative (9)
  16. Soothing (21)
  17. Stoned (32)
  18. Strong High (35)
  19. Strong Stoned (25)
  20. Uplifiing (11)
  21. Uplifting (32)
  1. Flowers early (outdoors) (11)
  2. Mold and pest resistant (26)
  3. Stealthy (12)
  1. 1
  2. Next

Auto Gorilla Cookies (Private Label)

Purple Haze (Private Label)

Fat Banana Automatic (Royal Queen Seeds) 3 seeds

Auto Bubble Gum (Private Label)

Auto Cinderella Jack (Dutch Passion)

Amnesia Haze (Private Label)

Auto Pineapple Express (Private Label)

Fatkid’s Cake (Amsterdam Genetics) 3 seeds

THC Master Mix (Private Label) 5 seeds

Auto Amnesia Haze (Private Label)

Pineapple Chunk (Barney’s Farm) 5 seeds

Super Lemon Haze Auto (Greenhouse Seeds)

Gorilla Glue (Private Label)

Amnesia Haze (Royal Queen Seeds) 5 seeds

Auto Rainbow Mix (Private Label) 5 seeds

Blue Amnesia Autoflower (Amsterdam Genetics) 3 seeds

OG Kush (Private Label)

Green Gelato Automatic (Royal Queen Seeds) 3 seeds

Girl Scout Cookies (Private Label)

White Choco Autoflower (Amsterdam Genetics) 3 seeds

  1. 1
  2. Next

For cannabis seeds with the highest THC percentage, you are at the right address. Stoned as a goat, or a tingling high: with these THC cannabis seeds effects are assured. Think of a beautiful Amnesia Haze or a nicely fast Jack Diesel Express. These ladies produce powerful THC weed and will get you onto cloud 9.

THC Weed

On this page you will find weed seeds which you can use to grow your own THC weed. This means that you will find weed varieties with a high THC content. How high? In this category you will find seeds with which you can grow plants with a THC percentage of 17% or higher. The strongest weed, in other words. Not all weed is rich in THC. Several strains have a mild amount and there are also strains without THC. But do you want to get really stoned from your home-made green gold? Then go for the weed seeds in this category and grow your own iron strong THC weed.

Tip: would you like to make weed oil or THC oil? Then it’s best to use one of the weed seeds on this page. Weed varieties with a high THC content provide the strongest THC oil. More on making THC oil later.

What is THC?

THC is one of the active substances in weed. It’s the abbreviation of Δ9-Tetrahydrocannabinol – the cannabinoid making you high or stoned. High is a more mental effect, while stoned is a physical feeling. Depending on the strain, you feel more high or stoned.

The effect of THC works because THC mimics a body’s own substance. That substance fits like a key in a lock, called the cannabinoid receptor. We have receptors throughout our body able to receive THC and other cannabinoids. For this reason, we can feel it in our bodies and in our heads. A high THC percentage in marijuana creates a tingling sensation in your head. Sometimes it stimulates the imagination, creativity or sexual excitement. If you combine it with other substances like CBD and terpenes, THC can give a heavy feeling in your arms or legs. The effect can differ per type of marijuana. Generally, we distinguish three types of weed, in which each strain can be divided.

Making THC Oil

Not everyone smokes or vaporizes weed to get THC into the body. You can also make your own weed oil or THC oil. The advantage is that you don’t have to smoke or vape THC. A few drops of THC oil will get you incredibly high or stoned. Many medical users benefit from THC oil. Moreover, with stronger weed you need to drip less. That can even halve the amount.

Do you want to make THC oil yourself? Then it is best to grow weed with these weed seeds. After harvesting, you can use the THC weed to make the oil. Want to know how? Check out the cannolator. A basic kit for making your own THC oil.

Haze, Kush & Skunk

In every coffee shop there are some haze, kush and skunk marijuana varieties for sale. What does that naming actually stand for? What are the differences in THC concentration?

Back in the days, when different types of cannabis were crossed for the first time, the “grandmothers” of marijuana came into being. Haze, kush and skunk were basically types of marijuana that became the founders of the great diversity of marijuana strains we know today. Each line has its own characteristics.

For example, Skunk produces compact buds full of resin that will get you popping high. Skunk is fragrant, has little leaves and grows practically everywhere. That’s exactly the reason why skunk is so popular when it was used in the 1980s to develop new varieties of marijuana.

Kush is actually a collective name for certain Indica strains. Kush cannabis is cannabis with roots in the Hindu Kush region in India, Afghanistan and Pakistan. OG Kush must be one of the best known strains. This strain is Kush taken to the west coast of the USA to grow into a very popular marijuana in the Californian sun.

Records for the highest THC percentages are often shattered by new Haze strains. These Sativa-dominant cannabis plants can contain THC percentages just shy of 30%!

High THC content of weed varieties

To give you a taste, we have already listed the THC content of various weed varieties. At least, the strongest weed we have. That will save you searching if growing weed is purely about the THC percentage. Or if you want to make very strong THC oil.

  • Fatkid’s Cake (Amsterdam Genetics) | 30% THC
  • Girl Scout Cookies (Dutch-Headshop House Brand) | 28% THC
  • Royal Gorilla & Hulkberry (Royal Queen Seeds) | 27% THC
  • Pineapple Chunk, Tangerine Dream & Liberty Haze (Barney’s Farm) | 25% THC
  • Jack Herer (Dutch-Headshop House Brand) | 25% THC

Tip: don’t just look at the THC percentage when growing weed. Other factors play a big role. Not every strain is the same. Check out the filters on this page to find the right weed seed for you.

The Strongest Weed in the World

With the strains listed above, you come pretty close to the strongest weed. Yet there are still much stronger strains on this globe. Theoretically there can be about 35% THC in a bud. Yet Mike Tyson, who started a cannabis company after his boxing career, has brought a strain on the market that is higher. It is called The Toad. It is measured at 37%.

Want to know more about the strongest weed in the world? Check out our blog: ” This is the Strongest Weed ”.

What Qualifies as High THC?

Weed (dried flowers) with a THC percentage of 20% or more is considered high. Usually, the THC percentage is 10 to 15%. You can achieve stronger concentrations of THC by, for example, making hash or dabs.

The amount of THC in a cannabis plant varies because of the genetics of the plant, but also through the way the plant grows. When the environment of the plant is optimal, and you give just enough water and nutrition, the THC percentage is higher. Briefly: take good care of your plant and she will take good care of you. At least it starts with THC cannabis seeds.

Mild Weed

Don’t you necessarily need the strongest strains? Prefer a weed with about 5 or 10 percent THC? Then we recommend two things. Check this category to see if there are any seeds in it for you. The seeds in this category have just as much THC as CBD and the total amount of the two substances often does not get much higher than 20%. CBD has the property of making your high more pleasant. In this large category you can also filter on a larger range of THC percentages.

Weed without THC

Not all weed contains THC. Weed without THC can also be found in our Seed Shop. Or rather: strains with a negligible amount of THC. So you don’t get stoned or high. Want weed without THC? Check out CBDivine or CBDenergy from Paradise Seeds, CBD Auto Charlotte’s Angel or CBD Auto Blackberry Kush from Dutch Passion or CBD Therapy from CBD Crew.