How to Grow MK Ultra
MK Ultra is a heavy-hitting, almost pure indica famous for its dense, resin-soaked buds and deeply relaxing effect. It carries a medium 17–20% THC, an earthy, kushy, spicy flavour and a happy, relaxed, talkative character, on a sturdy, hugely productive feminized plant with classic OG Kush roots.
Built from G13 crossed with OG Kush and a secret parent, this is an 80% indica, 20% sativa feminized hybrid with potent, body-forward genetics. The result is a compact, frosty plant that pairs the earthy, spicy kush profile of OG Kush with the raw power of G13, finishing dense and heavy.
Recommended Strains
MK Ultra
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THC | 17% - 20% (Medium) |
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Type | Feminized |
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Yield | High |
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Phenotype | 80% Indica / 20% Sativa |
Mimosa Cake Auto
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THC | 22% - 24% (High) |
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Type | Autoflowering |
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Yield | High |
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Phenotype | 40% Indica / 60% Sativa |
Because it is sturdy, forgiving and extremely productive, MK Ultra is a rewarding grow at any level. You can see the full genetics and buy MK Ultra feminized seeds on the strain page, and browse more of our feminized seeds alongside it.
Strain Profile at a Glance
| THC | 17–20% (medium) |
|---|---|
| Lineage | G13 x OG Kush x Secret |
| Type | Feminized |
| Genetics | 80% Indica / 20% Sativa |
| Climate | Tropical / warm |
| Flowering time | 8–10 weeks |
| Harvest | October |
| Height | 4.92 ft / 1.5 m |
| Yield | Heavy |
| Yield indoor | 1.31–1.8 oz/ft² (400–550 g/m²) |
| Yield outdoor | 28.22–35.27 oz/plant (800–1000 g/plant) |
| Grow difficulty | Beginner-friendly |
| Flavors | Earthy, Kush, Spicy |
| Effects | Happy, Relaxed, Talkative |
Promos & Deals
A Potent OG Kush Hybrid
MK Ultra built its reputation on potency and flavour. Its backbone is OG Kush, which gives it that unmistakable earthy, spicy kush profile and dense, resinous structure, while the G13 side adds raw power and a heavy, body-forward punch that indica lovers seek out.
For a grower, that heritage means a sturdy, consistent plant with real West Coast pedigree. It stays compact and manageable in the classic indica mould, yet delivers a serious harvest, which is exactly the combination that has kept MK Ultra popular for so long.
Climate and Where to Grow It
MK Ultra leans toward a warm, tropical climate with plenty of sun and good airflow. It is a vigorous, adaptable plant that performs both outdoors in a warm season and in a controlled indoor tent, staying manageable at around 1.5 m, which keeps it easy to work with in most spaces.
Outdoors it finishes around October, and in a warm spot a single plant can bring in a heavy 800–1000 g, one of its biggest strengths. Indoors it produces a strong 400–550 g/m². Keep humidity in check as the dense, chunky buds fill in, since tight indica flowers in a warm, humid room are worth protecting from mould and bud rot.
Indoors, aim for daytime temperatures around 70–82°F (21–28°C) and keep steady airflow moving through the canopy. Its sturdy, bushy structure handles its heavy colas well, but a little support late in flower helps the plant carry all that dense, resinous weight without bending.
Growing Feminized Photoperiod Seeds
As a feminized strain, every seed grows into a flowering female, so there is no need to sex the plants or remove males. That keeps the grow simple and means no wasted time or space on plants you would only cull later, which is part of why it is a manageable grow for newer growers.
Being a photoperiod plant, MK Ultra flowers on a light change rather than on age. Grow it under a long day (around 18 hours of light) through the vegetative stage, then switch to a 12/12 cycle to trigger flowering. A longer veg builds a bigger frame and harvest, while a shorter veg keeps this compact plant more contained.
Feeding Schedule (EC Guide)
This is a productive indica that sets dense, resinous buds, but like its OG Kush side it prefers a moderate feed rather than a heavy one. Start low, build up as the plant asks for more, and taper off for the final flush so the earthy, spicy kush flavour comes through clean.
| Stage | EC (mS/cm) | Notes |
|---|---|---|
| Seedling | 0.4–0.6 | Very light feed, focus on healthy root growth |
| Vegetative growth | 0.8–1.2 | Build the frame, raise nitrogen gradually |
| Early flower | 1.2–1.4 | Shift toward bloom nutrients (P and K) |
| Full flower | 1.4–1.6 | Peak bloom feed while the dense buds swell |
| Flush | 0.0–0.4 | Plain water for the final 1–2 weeks |
Flowering and Harvest
Once you flip to 12/12, bloom runs about 8–10 weeks. As an 80% indica it stays short and bushy, filling in dense, chunky, resin-coated buds that gain serious weight through the second half of flowering rather than stretching the way a sativa would.
Give the colas support as they fatten, since this plant carries a lot of weight, and keep the canopy open so light reaches the lower flowers. Harvest when most trichomes have turned cloudy with a few amber heads for the fullest expression, and run a short plain-water flush in the last week or two before you cut it down.
Drying and Curing
Dry whole plants or branches in a dark room at around 60°F (15–18°C) and 55–60% humidity for 7–14 days, until the thin stems snap rather than bend. A slow, even dry stops the dense, sticky buds staying damp in the middle while the outside dries out, which protects both the aroma and the heavy resin.
Then cure the trimmed buds in sealed jars, burping them daily for the first week and letting them settle for three to four weeks. A proper cure brings the earthy, spicy kush depth forward and smooths the smoke, which is exactly what this potent OG Kush hybrid deserves.
What to Do With Your Trim
Don’t bin the sugar leaves you remove while manicuring. MK Ultra is a frosty, resin-rich plant, so the trim is excellent for dry sift, bubble hash or rosin, giving you a bonus run of earthy, spicy concentrate from material most growers would otherwise throw away.
Flavor and Terpenes
MK Ultra has an earthy, kushy flavour with a distinct spicy edge, the classic OG-derived profile rather than a sweet or fruity one. It is a deep, savoury taste with real character, and it carries straight through a careful cure, true to its OG Kush heritage.
It carries a broad, complex terpene stack, and the ones that shape the flavour stand out clearly. Myrcene and humulene carry the earthy, kush depth; caryophyllene and eugenol add the warm, peppery spice; and borneol with pinene round it out with a fresh, resinous touch. A supporting cast of cedrene, terpineol, cadinene, camphene, linalool and more fills in the aromatic corners.
Effects and Best Use
With its heavily indica genetics, MK Ultra is reported as happy, relaxed and talkative, a mellow, body-forward character lifted by a cheerful, sociable edge. It leans toward evening and wind-down use, but the happy, chatty side keeps it enjoyable in company rather than purely heavy.
At a medium 17–20% THC it is potent but approachable, which suits both newer users and anyone who wants a genuinely relaxing effect without an overwhelming ceiling. That character, the huge outdoor yield, the sturdy structure and the earthy, spicy kush flavour are exactly why growers reach for MK Ultra.
Common Problems and Pro Tips
The main thing to watch with MK Ultra is its dense, chunky indica buds in a warm, humid room. Those tight flowers can trap moisture, so powdery mildew and bud rot are the most common problems, especially in the tropical conditions it otherwise enjoys. Keep humidity moderate through the second half of bloom, run steady airflow, and a light defoliation of the inner canopy helps air move around the thickest colas.
Its enormous outdoor potential, up to 800–1000 g per plant, is also something to plan for structurally. Those heavy colas put real strain on the branches, so stake or net the plant early and support the main colas as they fatten, or you risk branches bending or snapping late in flower just as the buds reach their heaviest.
As a pro tip, lean on its OG Kush side when feeding: MK Ultra performs best on a moderate diet rather than a heavy one, and pushing nutrients can show up as burnt leaf tips. Keep the feed lean, watch the trichomes rather than the calendar as harvest nears, and give it a clean plain-water flush in the final weeks so the earthy, spicy kush flavour comes through at its best.
FAQ
What are MK Ultra’s genetics?
MK Ultra is a feminized, heavily indica hybrid (80% indica, 20% sativa) built from G13 crossed with OG Kush and a secret parent. From OG Kush it takes an earthy, kushy, spicy profile and dense, resinous buds, while the G13 side adds raw potency and a heavy, relaxing body character.
Is MK Ultra indica or sativa?
It is very strongly indica-dominant, at roughly 80% indica and 20% sativa, which gives it a deeply relaxed, body-forward character and a compact, resinous bud structure. The small sativa share keeps the effect happy and talkative rather than purely heavy, so it stays pleasant and sociable.
How long does MK Ultra take to flower?
About 8–10 weeks once you switch to a 12/12 light cycle, with outdoor plants finishing around October. It is a photoperiod feminized strain, so it blooms on the light change rather than on age, filling in dense, sticky, resin-coated buds through the second half of flowering.
How much does MK Ultra yield?
MK Ultra is very productive, giving around 400–550 g/m² indoors and a heavy 800–1000 g per plant outdoors in a good spot. It packs on dense, sticky buds, so keep the canopy open and support the branches, and a warm, tropical-leaning climate helps it reach its full outdoor potential.
What does MK Ultra taste like?
Expect an earthy, kushy flavour with a distinct spicy edge, the classic OG-derived profile rather than a sweet or fruity one. Myrcene and humulene carry the earthy, kush depth, caryophyllene and eugenol add the warm, peppery spice, and borneol with pinene round it out with a fresh, resinous touch.
Is MK Ultra good for beginners?
Yes. It is a sturdy, forgiving feminized plant with no males to remove, and its compact, resinous structure is easy to manage. Keep the canopy open for airflow and watch humidity as the dense, sticky buds fill in, and it rewards new growers with a heavy, potent, kush-flavoured harvest.
