Blackjack

Lineage and Origin of Blackjack

Blackjack is a feminized cannabis strain created from Black Domina x Jock Horror genetics. This cross combines the indica background of Black Domina with the sativa-dominant genetics of Jock Horror, resulting in a hybrid that leans slightly toward the sativa side.

For growers, this lineage brings together two contrasting genetic influences in a cultivar that combines manageable plant development with an 8–9 week flowering period and productive indoor and outdoor performance.

Is Blackjack Sativa or Indica?

Blackjack is 60% sativa and 40% indica, making it a slightly sativa-dominant hybrid rather than a strongly sativa-leaning cultivar.

Its relatively balanced genetic composition is accompanied by plants that can reach approximately 5.25 feet (1.6 m). This gives indoor growers an important reference when planning vertical clearance, while still making Blackjack manageable with appropriate canopy control.

Blackjack Effects

Blackjack produces uplifting, energetic, euphoric, and relaxing effects, with THC levels ranging from 16% to 20%.

Its reported experience leans initially toward the more stimulating side, combining energy and euphoria with an uplifting character. A relaxing element provides contrast, resulting in an effect profile that reflects the combination of sativa and indica genetics found in the cultivar.

Blackjack Flavor

Blackjack has a citrus, earthy, and pungent flavor profile.

Bright citrus characteristics provide the more distinctive side of the experience, while earthy notes create a deeper base and a pungent element adds intensity. Its aroma follows a similar combination, bringing together fresh citrus and heavier earthy qualities.

How to Germinate Blackjack Seeds

As Blackjack is supplied as feminized seeds, growers can plan their cultivation around female plants without the selection process associated with regular seeds. Once the seedlings are established, allow sufficient vertical space for plants that can reach approximately 5.25 feet, particularly when growing indoors where later height management may be necessary.

Blackjack Flowering Time

Blackjack has a flowering period of approximately 8 to 9 weeks, giving growers a relatively compact timeframe for a slightly sativa-dominant cultivar.

As harvest approaches, cultivators can monitor trichomes and pistils to assess maturity. Outdoors, Blackjack typically reaches maturity between late September and early October, although exact timing will depend on local climate and growing conditions.

Indoor and Outdoor Growing Conditions

Blackjack can be cultivated indoors or outdoors, producing approximately 1.31–1.64 oz/ft² indoors and around 21.16–22.93 oz per plant outdoors under suitable conditions.

With plants reaching around 5.25 feet, indoor growers can use topping or Low-Stress Training (LST) to manage height and improve light distribution across the canopy. Maintaining stable temperature, humidity, lighting, and nutrition can support development, while outdoor plants are associated with temperate conditions, long sunny days, and relatively stable temperatures.

Blackjack Terpene Breakdown

The terpene profile described for Blackjack includes limonene, caryophyllene, myrcene, and pinene, complementing its citrus, earthy, and pungent character.

Limonene reinforces the brighter citrus side of the profile, while caryophyllene contributes spicy qualities. Myrcene adds earthy and musky notes, and pinene introduces a fresh pine character, giving the cultivar additional aromatic complexity beyond its primary flavors.

Best Climate and Where to Grow Blackjack in the U.S.

Blackjack is associated with a temperate climate with plenty of sunlight and moderate temperatures. Outdoor growers should prioritize locations with long sunny days and limited temperature fluctuations throughout the growing season.

Indoor cultivation offers greater environmental control and allows Blackjack to be grown in either soil or hydroponic setups according to the original cultivation information.

Top U.S. Cities for Growing Blackjack

Locations listed for growing Blackjack include San Diego, Portland, Denver, Seattle, Las Vegas, San Francisco, and Santa Fe. Actual outdoor suitability depends on local and seasonal conditions, and growers should consider applicable cannabis cultivation laws before starting a grow.