Rumour has it that Jack Herer is Sensi Seeds version of Arjans Greenhouse and Shanti's Mr Nice's Super Silver Haze. It's based around the same genetics with some minor tweaks as Arjan bred the Super Silver Haze in the Sensi breeding rooms with Skunk x NL x Haze, only he left his notes behind and Neville of Nevilles Haze fame donated his pure bred Haze line to Arjan which makes his Super Silver Haze marginally better than Sensi's Jack Herer but to all intents an purposes JH is Sensi's version of SSH and they're virtually the same.