Bred from sun-grown coastal genetics, Magnum delivers mold-resistant vigor and rapid completion in just 7–9 weeks, making it ideal for growers chasing fast harvests without sacrificing yield. This autoflower seeds hybrid bridges cookie, cake, and runtz lineages with full-spectrum terpenes and an earthy flavor profile that leans into that dessert-forward ancestry. Expect energetic, euphoric effects that settle into relaxation, hitting around 15% THC—enough for meaningful impact without overwhelming. At 100–160cm tall with straightforward cultivation demands, Magnum suits beginners and experienced growers alike, producing roughly 500g/m² indoors. Explore the full Coastal Genetics catalog to compare this strain with others like Blue Zombie, and discover why California coastal breeding continues to refine autoflowering performance.

Genetics & Lineage

Magnum Auto traces its genetics to 50% Sativa/50% Indica (Coastal Genetics). This hybrid-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 Coastal 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 15%, this provides a mild, approachable experience great for beginners or those seeking gentle relief.

THC Level & Potency

Magnum Auto delivers THC levels of 15%, placing it in the milder range, making it approachable for newer users or those seeking functional effects. 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 Magnum Auto

Magnum Auto is rated as easy difficulty, making it an excellent choice for first-time growers. The plants are resilient, forgiving of common mistakes like overwatering or inconsistent feeding schedules.

Indoor Growing: Expect a flowering time of 7-9 weeks with yields of 500g/m2. Plants typically reach 100-160cm indoors. This strain responds exceptionally well to SCROG (Screen of Green) and LST (Low Stress Training), which can boost yields significantly. 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 the dense, heavy buds this strain produces.

Flavor, Aroma & Terpene Profile

Magnum Auto features a earthy terpene profile that develops complexity throughout the flowering cycle. The complex aromatic bouquet develops fully after proper curing. 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 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 Magnum Auto?

This strain is ideal for beginner growers looking for a reliable, low-maintenance plant that delivers consistent results without advanced techniques. If you're looking for evening relaxation and deep stress relief, this is your strain.

Why Buy Magnum Auto from Seennabis?

When you purchase Magnum Auto through Seennabis, you are buying directly from Coastal Genetics — California coastal craft breeder. Every order includes verified genetics, discreet shipping, and responsive seller support. Coastal Genetics has completed over 37,750 sales with a 4.7-star rating from 2,832 verified reviews.