Highest THC Cannabis Strains of All Time: Reported Numbers

Short answer

No strain holds a verified world record for THC. There is no central registry. The highest figures come from breeder claims and lab results for single samples. The top reported number for cannabis flower is 37% THC for Future #1 from Anesia Seeds. A small group of strains sits in the 30% to 34% range. Most flower sold in US dispensaries tests between 18% and 28%.

best tasting cannabis strains

Highest reported THC strains

• Future #1 (Anesia Seeds): 37% THC reported by the breeder. Seed sellers repeat this number.
• Godfather OG: 34% reported. Often listed as the strongest indica.
• Grease Monkey (Exotic Genetix): 33% reported.
• Chiquita Banana: 33% reported.
• Chemdawg: 32% reported.
• Bruce Banner #3: 28.35% THC in a 2015 test of 600 Colorado flower samples.
• Gorilla Glue #4: 28% to 30% across several lab tests.
• Wedding Cake: 25% to 27% across several lab tests.

How THC percentage works

THC percentage is a share of total weight. One gram of flower at 30% THC holds about 300 mg of THC. That is the upper bound. Combustion destroys part of it. Smoking delivers less than the label states. Vaporizing and oral use change the number again.

more on this topic

Why the numbers move

Potency depends on genetics, light, nutrients, harvest timing, curing, and storage. Two plants from the same seed pack can differ by several points. Labs differ too. A 2015 Colorado survey of 600 samples found an average of about 17% THC, with the top sample at 28.35%. State tracking programs report average flower potency in the high teens to mid 20s, depending on the market.

best indica strains for chronic pain

Caveats on record claims

Most 30% and higher figures come from one lab test paid for by the grower or breeder. Outside labs seldom repeat the test. Test shopping is documented in the industry. A grower sends the same flower to several labs and picks the highest result. Treat any world record claim as a marketing number until a third party repeats it.

What to check on a label

Look for the lab name, the test date, and total THC, not just delta-9 THC. Total THC includes THCA, the acid form that converts to THC when heated. Flower at 30% delta-9 THC is rare. Flower at 30% total THC is common on high-potency labels.