RK
MK Ultra cannabis seeds packaging β€” Royal King Seeds UK
Hybrid
THC 22%
πŸ“ˆ High Yield
HybridFeminisedIn Stock

MK Ultra Feminised

Feminised PhotoperiodSee Lab Report β†’

Grow MK Ultra Feminised in the UK. Hybrid genetics at 22% THC, known for euphoric, happy, relaxed effects.

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Β£10.57
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Royal King Genetics β€” first-party test batch

Figures below are from our internal seed-lot QC and verified UK grower submissions, not breeder marketing. Determined from a single batch tested 2026-08-31 on 500 seeds.

Germination rate: 96.8% (n=500)
Last QC test date: 2026-08-31
Indoor yield: 402-534 g/mΒ² (avg across 10 verified grower reports)
Outdoor yield: 484-746 g/plant (avg across 9 verified grower reports)

About MK Ultra Feminised

Where you grow MK Ultra in Britain matters less than when you start it. This is one temperate maritime climate with a real north-south gradient: the south coast opens and closes its season around a fortnight either side of the central belt or upland Wales. Heat is almost never the constraint here. The wet finish is β€” rain sitting in dense flower through late September and October is what starts botrytis, and it ends more British outdoor crops than every insect on the plot combined. That puts the 8-9 weeks flowering window and the bud structure ahead of everything else on this page. Under lights none of it applies: daylength, temperature and humidity are yours to set, and MK Ultra can be run anywhere in the country on its merits.

The pressures on a British grow are fairly predictable. Damp is the first of them: botrytis in dense flower from September on, answered with open bud structure and moving air rather than with a spray. Indoors it is spider mite and thrips that arrive, and humidity above 60% in late bloom is what turns a contained problem into a lost room. Outdoors in a wet spring the slugs take more seedlings than every insect put together, and they do it overnight.

Flavour, aroma and effect

MK Ultra arrives in stages. The first draw at 22% THC brings a bright citrus edge that lifts off the palate immediately. The euphoric, happy, relaxed character follows within minutes, as a head and body effect at once. The mind stays clear while the muscles let go by degrees, which is what makes it adaptable β€” a small dose carries an afternoon, a larger one turns into an evening. The caryophyllene underneath adds a warmth that keeps the whole thing anchored.

Terpene breakdown

Primary: Limonene Β· Secondary: Caryophyllene Β· Tertiary: Linalool. This combination turns up often in cultivars that win things, and it is usually the one growers comment on when a jar is opened for the first time after curing. Limonene anchors the aroma, caryophyllene occupies the middle, and linalool sits behind both β€” which is the part that separates this strain from others sharing its primary terpene.

Who it suits

Who does well with MK Ultra? Indoor growers who want the timeline under their own control. Outdoor growers who want to choose when flowering starts. Anyone with the room and the patience to veg it properly before flipping. Difficulty is rated intermediate, which means a moderate learning curve that rewards attention without demanding a laboratory.

Effects

πŸ€—Euphoric
74% of people reported feeling Euphoric
😊Happy
65% of people reported feeling Happy
😌Relaxed
58% of people reported feeling Relaxed
🀩Creative
56% of people reported feeling Creative
😎Uplifted
45% of people reported feeling Uplifted
🀀Hungry
41% of people reported feeling Hungry
😴Sleepy
38% of people reported feeling Sleepy
πŸ˜†Giggly
31% of people reported feeling Giggly
🧠Focused
21% of people reported feeling Focused

Strain Type

Indica 50%Sativa 50%

Strain Data Sheet

🧬THC22% - 26% (High)
🌿LineageOG Kush Γ— G13
πŸ”¬TypeFeminised Hybrid
🌑ClimateTemperate, adaptable
πŸ“…HarvestLate Sept – Oct, UK outdoor (typical)
πŸ“Height100-120 cm
βš–οΈYieldMedium
🏠Yield Indoor350 g/m2
🌳Yield Outdoor800 - 1000 g/plant
⏱Flowering Time8-9 weeks

Packaging

Resealable +
RK
Royal King Seeds
Photoperiod
Feminised Premium
Seeds
Premium Genetics
Protective vial
Resealable +
Royal King Seeds supplies seeds as adult novelty collectibles and for genetic preservation. Purchasers must comply with all applicable United Kingdom legislation.
1
MK Ultra Feminised
royalkingseeds.co.uk
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FB
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πŸ”’Sealed for authenticity
πŸ’§Waterproof coating
πŸ›‘οΈAluminium interior lining
🏷️Protective sticker
πŸ“±QR code verification
πŸ”’Scratchable serial number

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MK Ultra Feminised β€” Breeder Information

Royal King Genetics

Bred and stabilised in-house by Royal King Genetics β€” our internal breeding team. Every batch is QC'd and germ-tested above 99% before it ships. Read the full breeding process and about page.

Stabilisation Level
BX2
Generations
3+
Breeding Programme
Royal King Genetics Backcross Line β€” BX2 modern hybrid stabilisation
Stabilisation Notes β€” What This Means for Your Grow

A modern late-2010s hybrid carrying at least one clone-only parent. BX2 is the right stabilisation point: two rounds of backcross fix the parent-cut traits without narrowing the population too far.

Breeding Goal

Pin the structural balance that came out of the original MK Ultra cross.

Selection Focus

Chosen for trichome density, bud structure and the hybrid trait balance the cross was engineered for.

Pollen / Mother Source

Royal King Genetics in-house breeder room β€” pollen taken from a generation-tracked sibling-male line.

Last Batch QC Verified
11 September 2026Β· 99%+ germination