MagnumStrain, Effects, Genetics, Grow Guide & Where to Buy
Among the strains American growers consistently come back to, Magnum sits near the top of the list, but the data behind the hype is what holds growers' attention. It is a balanced hybrid (49% indica / 51% sativa) testing at roughly 15% THC, with a flowering window of approximately 85 days (seed to harvest) as an autoflower. On this page we cover the effects, the lineage, the grow profile, and where to buy Magnum seeds in the United States.
Magnum Quick Stats
THC
15%
Indica
49%
Sativa
51%
Autoflower
Yes
Flowering
approximately 85 days (seed to harvest)
Difficulty
intermediate
Indoor Yield
550-600 g/m2
Outdoor Yield
100-250 g/plant
Plant Height
Up to 150 cm
MagnumEffects & Experience
Reported effects center on focused, calm. Magnum pulls toward a balanced state where neither head nor body dominates, a profile that holds up across phenotypes when the seeds are grown to their potential.
Growing Magnum
Growing Magnum fits cooler climates where photoperiod strains struggle to finish before frost, autoflower timing is calendar-driven, not daylight-driven. Magnum runs on an 18/6 light schedule from seed to harvest, autoflower genetics ignore photoperiod, so there is no flip and no light-cycle change. Indoor yields land around 550-600 g/m2 under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 100-250 g/plant. Expected plant height is Up to 150 cm, with intermediate cultivation difficulty. Practical tips that move the needle: apply low-stress training in week 2 of veg, bend the main stem horizontally and tie down to expose lower nodes; and top once at the 4th node to encourage 4-6 even main colas instead of one dominant cola. The most common challenge growers report is calcium and magnesium supplementation under bright LED lighting; cal-mag at 2-3 mL/gal from week 2 prevents the most common deficiency.
MagnumLineage & Genetics
Magnum is offered in the Royal King Seeds catalog. Read the description on this page as a general profile rather than a guarantee of your specific pack; expect some phenotype variation between packs.
Where to Buy Magnum Seeds in the USA
Magnum seeds ship from Royal King Seeds from within the United States. Estimated delivery is approximately 5-7 business days; actual timing varies by destination and carrier.
Magnum FAQ
Is Magnum indica or sativa?+
Magnum is a balanced hybrid with a 49% indica / 51% sativa split. The effects lean balanced, neither dominantly head nor body.
How long does Magnum take to flower?+
Magnum flowers in approximately 85 days (seed to harvest) from seed, since autoflower genetics ignore light cycle. Outdoor harvest typically lands 70-90 days after planting.
What is the THC content of Magnum?+
Magnum tests at approximately 15% THC when grown to its potential. Real-world numbers depend on grow conditions, harvest timing, and curing, well-grown phenotypes can land at the high end of that range, while poorly cured flower tests lower.
Is Magnum good for beginner growers?+
Magnum is rated intermediate difficulty. The autoflower genetics simplify the process, no light schedule changes and a fast seed-to-harvest timeline make it forgiving for first-time growers. Most growers with one harvest behind them handle this strain without difficulty.
Where can I buy Magnum seeds in the USA?+
Royal King Seeds ships Magnum seeds from within the United States, with estimated delivery in approximately 5-7 business days. The product page is at https://royalkingseeds.us/magnum-auto.