Spec sheet first — strain: sativa, seed type: autoflower, THC: 20-25%, yield band: medium, environment: indoor or outdoor.

Smell-first: cut a fresh Black Jack Auto cola and the room fills with citrus peel and damp soil before you've even reached the jar. That combination—bright and grounded at once—holds up through cure and gives the finished flower a character worth growing toward. Blimburn built this one to finish in 8–10 weeks from seed, which makes back-to-back runs realistic even for growers working a single tent. Indoor yields sit in the 400–500 g/m² range when plants get consistent light and aren't stressed early; push conditions harder and the numbers slide, so dialling in your environment before you drop these seeds pays off. THC tests between 20–25%, leaning toward clear-headed stimulation rather than sedation—useful if you want to stay functional. The moderate difficulty rating is honest: autoflower timing forgives less than photoperiod work, and topping needs careful timing.

Best suited to intermediate growers comfortable managing autoflower feeding schedules without overcomplicating them.

Genetics & Lineage

Black Jack Auto traces its genetics to Black Jack Auto (Blimburn Seeds). This sativa-dominant autoflower 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 Auto 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 minutes, starting as a cerebral buzz that gradually expands.

Growing Black Jack Auto

Black Jack Auto 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 60-100cm 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 45-55% 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 Auto features a fruity, citrus, earthy, pine terpene profile that develops complexity throughout the flowering cycle. Sweet berry and grape notes dominate the inhale, with a sugary exhale that lingers on the palate. 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 Auto 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 Auto?

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 Auto from Seennabis?

When you purchase Black Jack Auto 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.