From the lab panel — 19% THC, <2% CBD. From grower reports — 450g/m2 yield, citrus/sweet dominant in cured flower. moderate grow.

Advanced Genetics lists this at $30.66 — below the median of $38.93 across 4 listings. Pack options: 3-seed at $30.66, 5-seed at $44.99, plus larger sizes.

Lineage: Jack Herer × Skunk × Haze — the kind of cross that keeps showing up in collective gardens for a reason. At 19% THC and a citrus-forward nose that sharpens into something almost candy-sweet on the break, Jack Flash earns its space on a moderate grower's bench without demanding too much in return. Indoors or out, expect the canopy to finish in 9–10 weeks from flip, with indoor runs averaging around 450g/m² when light and airflow are dialed. The 60% indica lean keeps stretch manageable — you won't be fighting a sativa-heavy monster — but enough sativa character comes through in the finished effect to make this a daytime-capable cut rather than a couch variety. Phenotype expression stays fairly consistent run to run, which matters if you're dialing in a repeatable harvest schedule.

Best suited to growers moving past their first few grows who want solid, predictable output without a single-environment commitment.

Genetics & Lineage

Jack Flash traces its genetics to 60% Indica/40% Sativa (Advanced Genetics). This hybrid-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 Advanced Genetics, 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 19%, this offers a well-balanced experience suitable for most users with some cannabis familiarity.

THC Level & Potency

Jack Flash delivers THC levels of 19%, 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 with a balanced head-and-body experience that evolves over time.

Growing Jack Flash

Jack Flash 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 9-10 weeks with yields of 450g/m2. Plants typically reach 100-160cm 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

Jack Flash features a citrus, sweet terpene profile that develops complexity throughout the flowering cycle. A smooth, candy-like sweetness defines the flavor, with subtle complexity on the exhale. 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, Jack Flash 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 Jack Flash?

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 Jack Flash from Seennabis?

When you purchase Jack Flash through Seennabis, you are buying directly from Advanced Genetics — American craft breeder behind potent hybrids like Slurricane, Member Berries, and Permanent Marker. Every order includes verified genetics, discreet shipping, and responsive seller support.