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 8-10 weeks from seed 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 with discreet shipping and a 95% germination guarantee.
Magnum Quick Stats
THC
15%
Indica
49%
Sativa
51%
Autoflower
Yes
Flowering
8-10 weeks from seed
Difficulty
intermediate
Indoor Yield
450-550 g/m²
Outdoor Yield
500-700 g/plant
Plant Height
60-100 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 450-550 g/m² under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 500-700 g/plant. Expected plant height is 60-100 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 a Royal King Genetics in-house cross. The parental selection was chosen for hybrid vigor and a balanced effect profile, then stabilized over multiple generations to lock in phenotype expression. Seeds run true to the description on this page rather than spreading across a wide range of expressions.
Where to Buy Magnum Seeds in the USA
Magnum seeds ship from Royal King Seeds to all 50 US states with discreet packaging and a 95% germination guarantee. Average delivery is 3-5 business days, with the fastest routes typically reaching Alaska, Arizona, Arkansas, California, Colorado.
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 8-10 weeks from seed 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 to all 50 US states with discreet packaging, 3-5 day delivery, and a 95% germination guarantee. The product page is at https://royalkingseeds.us/magnum-auto, checkout accepts standard cards, Apple Pay, and crypto.