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High THC Seeds

Tetrahydrocannabinol or THC, is the main psychoactive compound responsible for the effects of cannabis. High THC seeds have been bred by crossing potent strains with potent strains resulting in a plant that contains exceptionally high levels of THC. In ideal conditions, our strongest strains of weed can of produce up to 35% THC.

At 420 Seed Bank, we offer a premium selection of high THC seeds, giving you access the most potent strains available from the best breeders around.

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What are high THC seeds?

For a strain to be classed as "high THC" these days, it has to have the potential of producing above 25% THC, simple as that.

Not so long ago, any cultivar that tested in at plus 20% THC was considered a true banger. But the last decade or so has seen some key advancements in breeding techniques and a rapid increase in potency, with more than a few strains now pushing an incredible 30 to 35% THC.

THC (tetrahydrocannabinol) is one of the two 'major' cannabinoids (along with CBD), and the psychoactive compound that gets you "high". The higher the THC content in a given strain, the stronger and more intense the effects will be.

Every single strain in our high THC seed catalogue has been hand-crafted for potency, offering a stronger and more intense experience than regular strains.

What is THC good for?

Apart from the obvious fun stuff (getting high), THC has a range of potential medical and therapeutic benefits.

  • It can act as an analgesic, helping to relieve the pain for chronic pain sufferers and those dealing with arthritis or multiple sclerosis.
  • It also has antiepileptic properties and may help reduce seizures
  • THC has also been shown to have pretty powerful anti-inflammatory effects, making it potentially beneficial for those with autoimmune disorders like Crohn's disease, lupus, and rheumatoid arthritis.
  • It may offer relief from anxiety and depression in low doses, but it can also exacerbate these conditions in higher doses, so caution is advised.

Advantages of growing high THC strains?

If you are growing weed for recreational purposes, then high-THC seeds are an obvious choice. But there are also some significant advantages to growing high THC strains for medical use:

  • Higher THC levels in your buds mean a more potent high from less product. This can actually save you some cash and cut down on your usage.
  • If you need a stronger dose of THC to alleviate the symptoms of your condition, high-THC strains offer a more potent option.
  • High THC seeds turn into plants with higher resin levels (when grown in ideal conditions), which adds to bag appeal and allows for more potent extractions and concentrates.
  • By carefully selecting high THC strains for unique terpene profiles, you can enhance the medicinal effects of your chosen strain.
  • High THC cultivars are heavily sought after by true cannasseurs, making them a valuable asset for growers looking to sell their products.

Growing tips to increase THC level

As with any strain, high potency or regular, if you want to squeeze the absolute maximum amount of THC from your grow, you need to pay close attention to lighting, nutrition, growing media, climate control, and timing your harvest right.

  • Optimize Lighting: Lighting is extremely important with high THC strains. Indoor growers should stick to LED or HID options and make sure they have calculated the ideal wattage for their grow space. Outdoors, try to plant in areas that get plenty of natural sunlight.
  • Nutrient Management: Provide your plants with the right balance of nutrients, focusing on nitrogen, phosphorus, and potassium, along with essential micronutrients. All the big-name nutrient companies offer special formulations targeting cannabis strains, so do some research and choose the one that best fits your needs.
  • Choose the Right Growing Media: Soil is one of the most critical factors for maximizing THC levels, as it plays a crucial role in delivering nutrients to your plants. Use a high-quality cannabis-specific soil mix that is nutrient-rich and well-draining.
  • Hydroponics Will Boost Potency: Hydroponics is the way to go if you're looking for the most potent plants. By providing nutrients directly to the roots, you can eliminate any potential soil deficiencies and achieve more significant yields.
  • Timing the Harvest: Pay attention to the color of the trichomes on your plants. Harvest when most have turned milky white with around 30% being amber for maximum THC potency.
  • Control the Climate: Outdoor growers have to wait for the perfect time to germinate and hope for the best, but indoor growers can control the climate in which their crops grow. Aim for a temperature range of 70-85°F (21-29°C) during the vegetation stage and 66-77°F (18-26°C) during the flowering stage. Humidity should be 50 to 60% until flowering begins, then slowly dropping down towards the 40% mark for harvest.
  • Avoid Stressing Plants: Keep your growing environment stable. Avoid fluctuations in temperature, humidity, and watering schedules to prevent stress that can negatively impact THC levels.
  • High and Low-Stress Techniques: If you want to make sure each seed reaches its maximum THC potential, using techniques like topping, supercropping, and ScrOGging, can help you achieve more significant yields.
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Apple Fritter Auto - Growers Choice
Apple Fritter Auto - Growers Choice
From: US$26.40
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 10-12 Weeks
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RS11 Feminized - Growers Choice
RS11 Feminized - Growers Choice
From: US$26.40
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Bubblegum x Fat Hog Feminized - Growers Choice
Bubblegum x Fat Hog Feminized - Growers Choice
From: US$26.40
  • THC: Over 22%
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Cherry Mac Muffin Feminized - Growers Choice
Cherry Mac Muffin Feminized - Growers Choice
From: US$26.40
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Original Oreoz Feminized- Growers Choice
Original Oreoz Feminized- Growers Choice
From: US$26.40
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Gary Payton Feminized - Barneys Farm
Gary Payton Feminized - Barneys Farm
From: US$43.56
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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White Widow XXL Feminized- Barneys Farm
White Widow XXL Feminized- Barneys Farm
From: US$43.56
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Biscotti Mintz Feminized - Barneys Farm
Biscotti Mintz Feminized - Barneys Farm
From: US$37.62
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Runtz x Layer Cake Feminized - Barneys Farm
Runtz x Layer Cake Feminized - Barneys Farm
From: US$43.56
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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Blue Sunset Sherbert Feminized - Barneys Farm
Blue Sunset Sherbert Feminized - Barneys Farm
From: US$43.56
  • THC: Over 25% THC
  • Yield: 500-700gr/m²
  • Flowering Time: 8-10 Weeks
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