stephen is right the whole canabinoid content of the strain is what counts not just thc . you have cbd thcv and dozens of other active compounds use smoke tests to choose your seeds not companies wild claims. alot of the 20 plus thc claimed strains are actually old and outdated. g-13 and white widow as examples are 15 plus year old strains. also who is doing the testing is it truely independent of the seed bank probaly not. ive smoked hash of 1 strain that definetly has a high thc concentration and then smoked some good og kush and the bud is stronger sometimes go figure. if thc was the only factor all cannabis would have more or less the same high which would get real boring. best way to grow is multiple strains then you can switch frequently so your tolerance never gets to high to any 1 strain. hope that is usefull.