Black Jack by Sweet Seeds

Black Jack carries variety code SWS01, the very first number in the Sweet Seeds catalog, and it remains one of the breeder’s most potent and productive feminized photoperiod strains. It joins the dense, sturdy Black Domina’98 with a standout Jack Herer, delivering Haze-style incense and citrus aromatics on a vigorous, heavy-yielding 50/50 hybrid.

Indoors, it is fully at home in a tent or grow room and finishes its bloom in about 9 weeks. Outdoors, planted directly in the ground with plenty of sun, Sweet Seeds describes it turning into a resinous, hairy monster of around three meters, a plant that rewards growers who give it room.

Yields match its reputation: 500–600 g/m² (1.64–1.97 oz/ft²) indoors and 500–700 g/plant (17.6–24.7 oz/plant) outdoors. The breeder counts 10 awards for Black Jack, spanning indoor, hydro, outdoor, and hash categories between 2008 and 2017.

Black Jack Genetics and Lineage

On one side is Black Domina’98, an Indica line known for potency, bud density, and resilience. On the other is a carefully chosen Jack Herer, famous for its cerebral drive and for the cathedral-incense bouquet associated with the Haze family.

The cross lands at an even 50% Indica and 50% Sativa. In practice, that means strong hybrid vigor, a well-branched frame, and buds with real weight, while the Jack Herer side keeps the aroma bright and complex. Sweet Seeds lists THC at 16–21% with roughly 1% CBD.

Aroma, Flavor, and Effect

The nose opens with citrus over a deep, incense-like Haze base, then moves into wood and damp earth. Pine and a sprinkle of spice round out the bouquet. It feels like walking into an old stone chapel carrying a handful of lemon peel and pine needles.

Smoke or vapor carries that same layering: citrus on the first draw, incense through the middle, and a woody, earthy finish that sits on the tongue.

The effect is clearly psychoactive and stimulating. Expect an energetic, happy, upbeat high that wakes up the mind and keeps the mood positive. It suits active days, creative work, and outdoor plans more than quiet nights on the couch.

Growing Black Jack Indoors and Outdoors

Indoors, Black Jack grows vigorously in vegetative growth, so a short veg period is usually enough to fill the space. Flip to 12/12 when plants are about half the target final height, as the Sativa side will stretch in early bloom. Topping and a SCROG net help turn its many branches into an even canopy of large, dense colas, ready in about 9 weeks of flowering.

Outdoors, this is a plant for growers with space. In the ground and in full sun, it can reach around three meters (about 10 ft) and develops heavy, resinous flowers. A rich soil, generous feeding through mid-season, and stakes or netting to support the branches all pay off, with yields of 500–700 g/plant (17.6–24.7 oz/plant).

Whichever environment you choose, keep air moving through the canopy late in flower; the large, dense buds appreciate good ventilation as they ripen.

Black Jack Characteristics

Strain type	Feminized photoperiod
Variety code	SWS01
Genetics	Black Domina’98 x Jack Herer
Indica/Sativa	50% Indica / 50% Sativa
THC	16–21%
CBD	1%
Effect	Psychoactive, stimulating, happy, energetic
Aroma/Flavor	Citrus, incense (Haze), woods, earth, pine, spices
Indoor yield	500–600 g/m² (1.64–1.97 oz/ft²)
Outdoor yield	500–700 g/plant (17.6–24.7 oz/plant)
Flowering time	9 weeks indoors
Height	Around 300 cm (118 in) outdoors in the ground
Best cultivation technique	Topping and SCROG indoors; in-ground planting outdoors

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