thc

y when i look on sum sites white widow is say 12%thc and other sites its 21.5%thc is there lots of diffferent tipes of white widow?

every seed bank breads their own seed's, or get them from different breeders around the world. so different breeders = different seeds

also testing for THC can depend on how the product is grown and handled, plus it's an expensive process so no seed bank is going to test 100 plants of the same variety just to get an average that is more accurate.