Puna Diesel the story. On May 2016 Cannabis Care Hawaii, organizers of the Hawaii Cannabis Expo held the 2nd annual Free the Plant event in Oahu. The winner for the island of Hawaii a.k.a. the Big Island, was Puna Diesel, entered by Professor Potgrower of Mtn. View. The stinky sample defeated many delicious, top grade, Hawaiian grown strains including a Pineapple that tested at 30% THC. The Puna Diesel sample was not tested unfortunately but most joints are left half smoked