Typically for Sweet Seeds, Black Jack is also available as a Fast version, meaning this genetics comes with an extremely short flowering period. Indoors, it can be harvested after about 53 days and produces 500 to 600g/m². Outdoors, Black Jack F1 Fast Version can even reach up to 700 grams per plant and is ready for harvest as early as mid-September. The strain is the result of crossing a Sweet Afghani Delicious Auto and an elite clone of Jack Herer. The aroma, like the other Black Jacks, is sweet and aromatic frankincense with a slight citrus note.