Black Jack is a name applied to two closely-related strains. One strain was created by Sweet Seeds, and is a cross between two Sensi Seeds parents — the mostly indica, Afghani landrace-derived Black Domina and the more balanced Jack Herer. The other Black Jack strain (sometimes spelled Blackjack) was created by Nirvana Seeds. This latter Blackjack is a cross between Black Domina and Jock Horror, Nirvana’s own spin on Jack Herer, which is sativa-dominant cross between staple strains Northern Lights, Skunk, and Haze. The THC composition of these Black Jacks cumulatively ranges between 15% and 25%.
Black Jack buds of the Nirvana variety tend to be smaller and popcorn-like, with pale green leaves and orange pistils that are covered in trichomes. The nugs of the Sweet Seeds variety on the other hand are larger and denser, sometimes with a purple tint to the leaves. Both varieties are very sticky and difficult to break up by hand. The high resin content of these strains makes them ideal for the production of hash and other THC concentrates.