MK UltraStrain, Effects, Genetics, Grow Guide & Where to Buy
MK Ultra is one of the most-searched cannabis strains in the United States, with a profile that holds up under scrutiny. It is a balanced hybrid (50% indica / 50% sativa) testing at roughly 22% THC, with a flowering window of 8-9 weeks under a 12/12 photoperiod. This guide pulls together the lineage, the effects, the grow data, and the practical answer to "where can I buy MK Ultra seeds in the USA" in one place.
MK Ultra Quick Stats
THC
22%
Indica
50%
Sativa
50%
Autoflower
No
Flowering
8-9 weeks
Difficulty
intermediate
Indoor Yield
350 g/m2
Outdoor Yield
800 - 1000 g/plant
Plant Height
100-120 cm
MK UltraEffects & Experience
Reported effects center on euphoric, happy, relaxed. MK Ultra 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 MK Ultra
Growing MK Ultra fits most US climates, the 8-9 week flower fits inside nearly every outdoor window from Florida to Maine. MK Ultra is photoperiod, which means you control when it flowers by switching from 18/6 (vegetative) to 12/12 (flowering). Most indoor growers veg for 4-6 weeks before the flip. Indoor yields land around 350 g/m2 under quality LED, and outdoor plants given full sun and 5-7 gallon containers reliably produce 800 - 1000 g/plant. Expected plant height is 100-120 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 over-feeding nitrogen past week 1 of flower, switch to bloom nutrients within 7 days of seeing pistils.
MK UltraLineage & Genetics
MK Ultra 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 MK Ultra Seeds in the USA
MK Ultra 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.
MK Ultra FAQ
Is MK Ultra indica or sativa?+
MK Ultra is a balanced hybrid with a 50% indica / 50% sativa split. The effects lean balanced, neither dominantly head nor body.
How long does MK Ultra take to flower?+
MK Ultra flowers in 8-9 weeks once you flip to 12/12 light cycle. Outdoor harvest typically lands in late September to mid-October across most US zones.
What is the THC content of MK Ultra?+
MK Ultra tests at approximately 22% 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 MK Ultra good for beginner growers?+
MK Ultra is rated intermediate difficulty. Photoperiod genetics give you control over plant size and harvest timing, which means a bit more responsibility for getting the schedule right. Most growers with one harvest behind them handle this strain without difficulty.
Where can I buy MK Ultra seeds in the USA?+
Royal King Seeds ships MK Ultra seeds from within the United States, with estimated delivery in approximately 5-7 business days. The product page is at https://royalkingseeds.us/mk-ultra-feminized.