Short answer

High-THC, low-CBD strains are cultivars that test above roughly 20% total THC and under 1% total CBD. Names that show up on that list include Bruce Banner, GG4, Chemdawg, Girl Scout Cookies, Wedding Cake, Runtz, MAC, Sour Diesel, Do-Si-Dos, and Green Crack. The name does not guarantee the ratio. Only a batch-specific lab report does.

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What counts as high THC and low CBD

Scientists sort cannabis into chemotypes. Type I plants are THC dominant, meaning THC is the main cannabinoid and CBD sits near the detection floor. Type II plants carry meaningful amounts of both. Type III plants are CBD dominant.

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Total THC is not the same as the THC number printed on some old labels. Convert it with this math: THCA multiplied by 0.877, plus any already-active THC. THCA is the acidic form that converts to THC when heated. Total CBD is calculated the same way from CBDA.

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A flower at 24% THCA and 0.4% THC lands near 21.4% total THC. A flower at 0.6% total CBD is effectively CBD free for practical purposes.

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High-THC, low-CBD strains

  1. Bruce Banner, often 24% to 29% total THC, CBD usually under 0.5%.
  2. GG4, also sold as Original Glue, often 20% to 27% total THC, CBD near 0.2%.
  3. Chemdawg, often 20% to 25% total THC, CBD trace to 0.3%.
  4. Girl Scout Cookies, often 19% to 26% total THC, CBD under 1%.
  5. Wedding Cake, often 22% to 27% total THC, CBD under 1%.
  6. Runtz, often 20% to 26% total THC, CBD trace.
  7. MAC, short for Miracle Alien Cookies, often 20% to 27% total THC, CBD under 1%.
  8. Sour Diesel, often 19% to 25% total THC, CBD trace.
  9. Do-Si-Dos, often 20% to 28% total THC, CBD under 1%.
  10. Green Crack, often 18% to 24% total THC, CBD under 1%.

Ranges vary by grower, harvest, and grow room conditions. Two jars of the same strain from two farms can differ by several points of THC.

How to verify a batch before you buy

  1. Ask the budtender or seller for the certificate of analysis, usually called a COA, for the exact batch on the shelf.
  2. Find the total THC row and confirm it clears your target number.
  3. Find the total CBD row and confirm it sits under 1% if you want a true Type I product.
  4. Match the batch or harvest number on the COA to the number printed on the package.
  5. Check the test date and reject anything older than about six months for flower.
  6. Buy a small amount first, since terpenes and freshness change how the same THC level feels.

Why the ratio matters

CBD can soften some THC effects, including anxiety, racing heart, and short-term memory disruption. Research on this interaction is still developing, but the pattern shows up across several controlled studies. If you want the full THC effect with less CBD interference, a low-CBD chemotype is the practical choice. If you want a gentler ride, a Type II flower with both cannabinoids is the better pick.

Potency has climbed over the decades, so a 25% flower is not a mild product. Start with one or two puffs, wait fifteen minutes, and adjust. High-THC flower also degrades faster when stored warm or exposed to light, so keep it in a sealed jar away from heat.