Emerald Jack is a sativa-leaning hybrid. It was created by Emerald Triangle Seeds, a breeding company named for Northern California’s notoriously fertile and cannabis-friendly Humboldt County. Enduring favorite Jack Herer lends this strain not only its name but also its strong herbal and citrus flavor profile. Emerald Jack’s other parent strain is the sleepy Emerald OG. With a refreshing flavor and a long-lasting, buzzy high, this is a go-to daytime sativa. Its THC content ranges from 15% to 20%.