J1 also known as "Jack One " "Jack 1 " and "J-1 " is a high-end sativa hybrid weed strain that is gaining widespread popularity. J1 is a cross between two famous sativas Skunk #1 and Jack Herer and is best known for its strong uplifting clear-headed buzz that allows for extra mobility. The flowers are emerald green and frosty with a sweet aroma resembling the unmistakable Jack Herer pungency.