The shortest version: Blimburn Seeds's take on sativa genetics, 40-60% THC, 8-10 weeks flowering, moderate grow.

Those THC figures deserve a second look—40–60% THC is far outside what any whole-flower cannabis currently tests at (most labs cap out around 34–35% even for the resinous outliers), so treat the published number as a marketing ceiling rather than a lab result. What Blimburn's Magnum Auto does reliably produce is a fast-finishing sativa-leaning autoflower that wraps up in 8–10 weeks from sprout to chop, with indoor yields sitting in the 400–500 g/m² range when light and feed are dialled in. Expect citrus up front, shifting into pine and damp earth as it dries—nothing complex, but clean and consistent. Plant height stays manageable, which helps in tents or smaller Canadian grow rooms where vertical space runs out fast. Moderate difficulty means you'll want at least one previous auto run under your belt before committing a full canopy to it.

Best suited to intermediate growers who want a quick turnaround without babysitting a photoperiod schedule.

Genetics & Lineage

Magnum traces its genetics to Magnum Autoflower (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 60%, this is a potent strain recommended for experienced users — newcomers should start low and go slow.

THC Level & Potency

Magnum delivers THC levels of 40-60%, placing it in the high-potency category alongside powerhouses like Gorilla Glue and Girl Scout Cookies. 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 Magnum

Magnum 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

Magnum features a citrus, earthy, pine, floral 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, Magnum 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 Magnum?

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 Magnum from Seennabis?

When you purchase Magnum 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.