Sir Jack

Sir Jack is a tall, sativa-dominant variety descended from a Jack Herer S1 selection. THC typically sits between about 15–25%, producing an uplifting cerebral start that eases into a more relaxed, focused body state. Users report a blend of energetic clarity and calm — good for daytime tasks that need creativity or sustained attention without turning jittery. Aroma and flavor lean toward spicy incense and bright citrus with haze-like herbal overtones; dense, resinous buds carry that perfume. Flowering indoors runs long for a sativa, roughly 10–14 weeks, and the plants can get quite tall while delivering a high indoor yield if trained and supported. It’s considered a moderate grow — vigorous and robust but you’ll want to control humidity during late flower because the big, compact colas can be prone to mold. Overall, Sir Jack is a reliable sativa-first option for growers who want a productive indoor plant with pronounced citrus-spicy terpenes and a stimulating-then-relaxing effect profile. It’s also been recognized in competitive events for its quality, which aligns with the strain’s strong resin production and standout aroma.