The shortest version: Blimburn Seeds's take on sativa genetics, 20-25% THC, 8-10 weeks flowering, moderate grow.

Blimburn Seeds lists this at $25.98 — the lowest base price in the comparison ($25.98 floor). Pack options: 3-seed at $25.98, 5-seed at $36.20, plus larger sizes.

Lineage: Critical Mass × Jack Herer, both selected by Blimburn Seeds for output and head-effect rather than sedation. That cross shows up clearly in the numbers—THC runs 20–25% with a fruity-citrus nose that sharpens into diesel on the exhale, a combination that reads as more complex than either parent on its own. Indoors, expect 400–500g/m² after an 8–10 week flower cycle; plants stretch enough that growers without vertical room should top early or consider a scrog net. Difficulty sits at moderate, meaning she responds well to training but doesn't require experienced hands to finish properly. The high is alert and functional—useful in the morning or early afternoon without the heavy body weight some indica-leaning crosses carry. Both indoor and outdoor environments work, though outdoor runs in warm climates tend to push toward the top of the yield range.

Best suited to growers who want a high-THC sativa-dominant plant without committing to a 12+ week flower schedule.

Genetics & Lineage

Critical Jack traces its genetics to Critical Jack (Blimburn Seeds). This sativa-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

Critical 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 minutes, starting as a cerebral buzz that gradually expands.

Growing Critical Jack

Critical 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 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

Critical Jack features a fruity, citrus, diesel, skunky 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, Critical 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 Critical 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 Critical Jack from Seennabis?

When you purchase Critical Jack through Seennabis, you are buying directly from Blimburn Seeds — Barcelona-based breeder with one of the largest feminized + autoflower catalogs in Europe — over 1,200 strains spanning Spanish classics, exotic American hybrids (Banana Jelly x Permanent Marker, Skunk Berry, Glookies), and modern cookie/cake genetics. Every order includes verified genetics, discreet shipping, and responsive seller support.