From the lab panel — 20-25% THC, <1% CBD. From Canadian grower reports — 400-500g/m2 yield, citrus/skunky dominant in cured flower. moderate grow.

Lineage: Black Domina × Jack Herer, bred by Blimburn Seeds out of Barcelona — two very different parents that pull in opposite directions and somehow meet in the middle. The indica side keeps flowering tight at 8–10 weeks and pushes indoor yields into the 400–500 g/m² range without asking much in return; the Jack influence shows up in the nose, a sharp citrus-skunk combination with enough earthiness underneath to remind you which genetics are doing the heavy lifting. THC tests consistently land between 20–25%, so this isn't a strain to underestimate on dosing. Plants handle both indoor tents and outdoor Canadian summers reasonably well, though they'll need some training attention during stretch to keep canopy even. Expect a relaxed, creative effect that doesn't put you on the couch immediately.

Moderate-experience growers who want a reliable eight-to-ten-week photoperiod without babysitting it through every stage will find this one straightforward enough to run back-to-back.

Genetics & Lineage

Black Jack traces its genetics to Black Jack (Blimburn Seeds). This indica-dominant feminized seed produces plants that express the best traits of its parent lineage, delivering consistent results for growers of all experience levels. Bred by Blimburn Seeds, each seed is selected for genetic stability, terpene expression, and vigor.

Effects & Experience

Users report primarily relaxed and euphoric effects, making this strain ideal for evening use and unwinding after a long day. The body-centered stone builds gradually, easing tension and promoting deep physical relaxation. With THC levels reaching 23%, this offers a well-balanced experience suitable for most users with some cannabis familiarity.

THC Level & Potency

Black Jack delivers THC levels of 20-25%, placing it in the moderate-to-strong range that most regular consumers find comfortable. CBD content is minimal, so the psychoactive effects are front and center. The onset typically arrives within 5-10 minutes, settling into the body as a warm, heavy relaxation.

Growing Black Jack

Black Jack is rated as moderate difficulty, making it suitable for growers with some experience. Basic knowledge of nutrient schedules, pH management, and environmental controls will help maximize results.

Indoor Growing: Expect a flowering time of 8-10 weeks with yields of 400-500g/m2. Plants typically reach 100-180cm indoors. Standard training techniques like topping and LST will help manage height and improve light penetration. Maintain temperatures between 68-80°F with relative humidity around 40-50% during flowering.

Outdoor Growing: This versatile strain performs well in both indoor and outdoor environments. Outdoor growers in warm climates can expect harvest from late September through October. Watch for humidity during late flowering to prevent bud rot, especially with dense flower formations.

Flavor, Aroma & Terpene Profile

Black Jack features a citrus, skunky, earthy, pine terpene profile that develops complexity throughout the flowering cycle. Bright lemon and orange zest punch through on the inhale, with a tangy, refreshing finish. The aroma intensifies significantly during the final 2-3 weeks of flowering — carbon filtration is recommended for indoor grows requiring discretion.

Medical Benefits

While individual experiences vary, Black Jack is commonly reported to help with stress relief, chronic pain, insomnia, and muscle tension. The deeply relaxing effects make it a popular choice among medical users seeking nighttime relief. As with any cannabis strain, start with a low dose and increase gradually. Consult a healthcare professional before using cannabis for medical purposes.

Who Should Grow Black Jack?

This strain is ideal for intermediate growers ready to push their skills and be rewarded with superior results. If you're looking for evening relaxation and deep stress relief, this is your strain.

Why Buy Black Jack from Seennabis?

When you purchase Black Jack through Seennabis, you are buying directly from Blimburn Seeds — Barcelona-based breeder with one of the largest feminized + autoflower catalogs in Europe — 1,245 strains spanning Spanish classics, exotic American hybrids, and modern cookie/cake genetics. Every order includes verified genetics, discreet shipping, and responsive seller support.