MK Ultra Strain

MK Ultra Strain: The Cup-Winning OG Kush × G13 Indica

The MK Ultra strain is a heavy indica from Amsterdam's T.H.Seeds, bred by crossing an LA cut of OG Kush with the legendary G13. It took 1st place in the Indica category at the 2003 High Times Cannabis Cup in Amsterdam and placed again in 2004. Expect a piney, earthy, pungent nose, a fast-acting euphoric onset, and a hypnotic body high that most people save for the end of the day. It sits in the heavy, wind-down corner of our THCA flower collection.

Yes, the name is a nod to the CIA's Cold War-era MKUltra program — the breeder calls it a reference to the 1950s LSD experiments. That's where the connection ends; the strain itself is all OG and Afghan-indica weight. Below: the real lineage, the awards record, the terpene profile, how strong it actually is, how the high unfolds, how to use it, how to grow it, and how to judge a bag.

MK Ultra Strain Genetics & Lineage

• Type: Indica-dominant. Leafly lists it as an indica; AllBud calls it a 70% indica / 30% sativa hybrid; SeedFinder says "mostly indica." Every source agrees on the sleepy, body-heavy effect.
• Ancestry: OG Kush × G13. T.H.Seeds' own listing (via GrowDiaries) specifies "LA's O.G. Kush." SeedFinder's family tree traces that OG side back to an Emerald Triangle strain crossed with Hindu Kush.
• Breeder: T.H.Seeds, Amsterdam — credited by Leafly, SeedFinder and GrowDiaries.
• THC: Leafly lists 20% ("higher than average"); AllBud 18%; most retail listings land around 19–22%.
• CBD: Negligible — Leafly lists 0%, AllBud 1%.
• Aliases: MKU, MK Ultra OG and Mk (Leafly); GrowDiaries lists T.H.Seeds' seed line as MK-Ultra Kush.
• Seeds: feminized and regular, plus an autoflower, Auto MK-Ultra Kush, from the same breeder.

What G13 brings — and the legend behind it

G13 is one of cannabis's most mythologized cuts. The popular story says U.S. government researchers bred it and a cutting escaped into the underground. Weedmaps notes that versions of the tale involve the CIA, the FBI and University of Mississippi researchers, but that "there's no reliable evidence that federal agents actually bred G13." What is consistent: G13 is a heavy, Afghan-leaning indica known for a euphoric lift that sinks into deep relaxation and sleep. In MK Ultra, G13 supplies the compact structure and the couch; OG Kush supplies the pine, fuel and fast onset.

Why it's called MK Ultra

The name comes from Project MKUltra, the CIA's Cold War mind-control research program. Leafly says the strain is named for its "methods of mental manipulation"; T.H.Seeds frames it as a nod to the 1950s LSD experiments and describes the high as "hypnotic." Pairing it with G13 — the strain with its own government rumor — made the theme hard to resist. That's the extent of the story: no part of the strain's history involves the program itself.

The awards record

Leafly, SeedFinder and the breeder all list MK Ultra as the 1st-place Indica at the 2003 High Times Cannabis Cup in Amsterdam and 2nd place in 2004. Wikipedia's Cannabis Cup winners list confirms the 2004 result — MK Ultra by TH Seeds appears in the Indica Cup behind BC Bud Depot's God Bud — while its 2003 entry lists only the overall winner, so the 2003 category win rests on the breeder's and Leafly's records. SeedFinder also lists a grower's 13th-place indica entry at the 2015 Karma Cup.

Not to be confused with

• MK Ultra Black Ops: a darker, denser selection or MK Ultra-derived line sold by several breeders, with pedigrees that vary — not the original T.H.Seeds strain.
• Ultra Sour: T.H.Seeds' MK Ultra × East Coast Sour Diesel — a sativa-leaning child (Leafly lists 17% THC).
• Cold Creek Kush: another T.H.Seeds offspring, Chemdawg × MK Ultra, per SeedFinder.

SeedFinder counts 34 direct descendants in all, including AK 47 Ultra, Flex Fuel (White Runtz × MK Ultra) and a G-13 backcross. Leafly also lists Cannatonic, the well-known high-CBD strain, among its offspring.

MK Ultra Terpene Profile

Leafly lists myrcene as MK Ultra's dominant terpene, followed by caryophyllene and limonene. The breeder's emphasis on an "intense pine taste" points to pinene as a supporting player, inherited from the OG Kush side. That myrcene-first stack is typical of sleepy, body-heavy indicas — and lines up with the "sleepy, relaxed, tingly" effects reviewers report.

• Myrcene: Earthy, herbal and musky — the heavy floor under MK Ultra's high and the terpene most associated with its sleepy finish.
• Caryophyllene: Peppery and woody, the spice in the "woody, pungent" flavor notes, and the only common terpene known to act directly on CB2 receptors.
• Limonene: The lemony citrus some growers and Theory Wellness pick up on the nose, and part of the fast euphoric start.
• Pinene: Sharp pine — the "long-lasting piney flavor" the breeder highlights, straight from the OG Kush side.

The skunky, "chemical" pungency AllBud describes isn't one terpene; it's the OG Kush family's sulfur-and-fuel funk layered over G13's hashy earth.

Appearance

MK Ultra grows compact, dense buds — Leafly calls the flowers "particularly sticky, dense, pungent," and the breeder describes them as "tightly resin-coated." Colors run olive to forest green with orange and white pistils; AllBud notes brown and orange hues on leafier samples. A good batch carries a thick layer of milky trichomes. SeedFinder's users rate it above average for bud-to-leaf ratio, so well-trimmed flower should look chunky rather than wispy.

Aroma and Flavor

Crack a jar and the first hit is pungent — earthy, skunky and woody, with pine cutting through. AllBud lists the aromas as chemical, earthy, pungent and sweet; Theory Wellness describes "lemony citrus and diesel" on the nose. Grind it and the pine gets louder. On the inhale, expect sweet pine and woody earth; on the exhale, a hashy, skunky finish that lingers. SeedFinder's users report lemon, hashish and earth; Leafly's community tags it earthy, pungent and woody. The breeder sums it up in one phrase: a "very intense pine taste."

Recreational Effects

Leafly describes MK Ultra's euphoric effects as "fast-acting," and AllBud warns that it hits hard. The high starts in the head with a quick, happy lift, then sinks into the body. On Leafly, with more than 800 ratings, the most-reported effects are:

• Sleepy: the headline effect — MK Ultra is a nighttime strain for most people.
• Relaxed: a heavy, full-body calm that deepens with dose.
• Tingly: a warm, buzzing body feel early in the session.
• Euphoric and happy: AllBud's and the breeder's tags for the first stage, before the weight arrives.
• Hungry: the breeder lists it; expect the munchies.

The word that keeps coming up is "hypnotic" — the breeder's description, echoed by AllBud. It's not a racy, trippy high; it's a slow, heavy-lidded fade.

How the high unfolds: onset, peak and duration

• First 5 minutes: a fast head change — a warm, euphoric lift and a tingle.
• 15–60 minutes: the peak — the body gets heavy, thoughts slow down, and the couch looks inviting.
• 1–3 hours: a long, sedated settle that often ends in sleep. AllBud has a reviewer who felt groggy the next morning after a big dose.

Because it comes on quickly, it's easy to overshoot. Take a hit, wait, and decide from there.

→ Experience it yourself — shop Diesel Hemp's THCA Flower

How Strong Is MK Ultra?

MK Ultra's reputation for strength comes more from how it hits than from record-breaking numbers. The listed THC figures are moderate by today's standards:

• Leafly: 20% THC, 0% CBD — flagged as "higher THC than average."
• AllBud: 18% THC, about 1% CBD.
• Retail listings: mostly in the 19–22% range for MK Ultra and its family cuts.

So why does it feel strong? The fast onset and myrcene-heavy, sedating profile make a moderate dose land hard, which is why AllBud's reviewers call it overpowering for new or low-tolerance users. Modern selections and well-grown indoor batches can test higher, but the grower and batch matter more than the name.

THCA flower is labeled differently from dispensary flower: the lab reports THCA, which converts to THC when heated, plus a small amount of delta-9 THC. When you compare a batch of MK Ultra against the 18–22% range above, compare total THC on the COA, not the headline number — our guide on how to read a THCA flower COA walks through the math.

MK Ultra vs Similar Strains

• vs OG Kush: the parent that gives MK Ultra its pine and fuel. OG Kush is more balanced and heady; MK Ultra is heavier and sleepier thanks to G13.
• vs Hindu Kush and Afghan Kush: pure mountain indicas in the same hashy, earthy family. They're mellower; MK Ultra has more OG punch.
• vs Master Kush and Bubba Kush: other classic sleepy indicas. Bubba is sweeter and hashier; Master Kush is earthier and more even; MK Ultra is the piniest of the three.
• vs Northern Lights: another classic indica icon — sweeter and gentler on the head, with a similar sleepy finish.
• vs Mule Fuel: our closest in-stock match. It's GMO-family gas — GMO Cookies × Lurch — so it's louder and more garlicky-fuel than MK Ultra's pine-and-earth, but it lands the same way: indica-leaning, body-first and best at night.

Who MK Ultra Is (and Isn't) For

Good fit: evening and nighttime use; experienced smokers who want a heavy, classic indica; fans of piney, earthy, hashy OG flavors.

Poor fit: beginners, daytime use, or anyone who needs to stay productive — MK Ultra is built to shut the day down. If you want something sweeter and a little gentler for the same wind-down, Blueberry Pancakes — a myrcene-led, indica-dominant dessert strain, from $24 — is the softer option on our shelf.

How to Use MK Ultra THCA Flower — and How Much

THCA has to be heated to do anything. Raw, it isn't intoxicating; heat converts it to THC (decarboxylation), which is why the method matters as much as the strain.

• Smoking (joint, pipe, bong): the fastest onset. Take one or two small hits, then wait 10–15 minutes before deciding on more.
• Dry-herb vaporizer: the best way to taste the pine before the earth takes over. Around 350–380°F keeps the pinene and limonene bright; 390–410°F brings out the heavy, myrcene-driven body.
• Pre-rolls: the no-prep option — see our THCA pre-rolls.
• Homemade edibles: decarb the flower first. Edibles take 30–120 minutes to kick in and last far longer, so start low and wait the full two hours.

How much? New or occasional users: one small puff, then wait 15–30 minutes — MK Ultra is fast but heavy, and it's easy to overdo. Regular users usually find two or three hits delivers the full arc. Plan to be home. You can always add more; you can't take it back.

Medicinal Benefits

These are uses consumers report on Leafly and AllBud, not established clinical outcomes. Individual response varies with dose, tolerance and chemotype.

• Stress: the most-cited use on Leafly (about 39% of reviewers).
• Pain: about 37% on Leafly; AllBud also lists chronic pain and arthritis.
• Anxiety: about 32% on Leafly — though at high doses the dizziness can work against you.
• Sleep: insomnia appears on AllBud's and the breeder's lists, consistent with "sleepy" as its top effect.
• Appetite and nausea: both listed by AllBud and the breeder.

For a plain-language primer on how terpenes are thought to shape these effects, see Project CBD on terpenes. Nothing here is medical advice, and nothing on this page is intended to diagnose, treat, cure or prevent any disease. If you take prescription medication or have a health condition, talk to your doctor before using any cannabis product.

Side Effects and Cautions

• Dry mouth and dry eyes — the most common complaints on Leafly and AllBud.
• Dizziness — Leafly's third-listed negative, usually from too much too fast.
• Headache — occasionally reported on AllBud.
• Heavy sedation and next-day grogginess — at high doses.

Is MK Ultra good for sleep? For most people, yes — that's its reputation. Don't drive or operate anything after using it, and talk to your doctor first if you take prescription medication (especially sleep aids or sedatives), are pregnant or nursing, or have a heart condition.

Is MK Ultra Top Shelf? How to Judge a Good Bag

• Ask about the source. True MK Ultra traces to T.H.Seeds' OG Kush × G13. "Black Ops" and other MK-branded cuts are different selections.
• A current third-party COA naming the lab, with THCA, delta-9 and total THC. Ours are on the lab results page.
• Pine and pungency on the nose. A real MK Ultra smells loud — piney, earthy and skunky. Faint or hay-like flower has lost its terpenes or was rushed through the cure.
• Dense, sticky buds with a heavy trichome coat; leafy, airy flower suggests poor growing or trimming.
• Proper moisture — dense indica buds can hide dampness. They should snap, not bend.

Growing MK Ultra

MK Ultra is a compact, fast-finishing indica that's well suited to indoor tents. Leafly notes that "indoor growing is facilitated by the plant's short stature," and growers on GrowDiaries describe it as easy and stress-resistant.

• Flowering: 8–9 weeks indoors per the breeder; SeedFinder lists about 58 days. One GrowDiaries grower harvested at 52 days and again at 70.
• Yield: about 350 g/m² indoors (breeder). Leafly calls it above average; AllBud says average.
• Height: 100–120 cm. An AllBud reviewer found it wider than tall, with colas up to 7–10 inches.
• Phenotypes: SeedFinder lists two, both short, compact and fast-flowering.
• Environment: indoor, outdoor or greenhouse; dense buds mean you should watch humidity late in flower.
• Seeds: T.H.Seeds offers feminized and regular MK Ultra, plus the autoflowering Auto MK-Ultra Kush.

Is MK Ultra THCA Flower Legal?

Under the 2018 Farm Bill, hemp is federally legal when it contains no more than 0.3% delta-9 THC on a dry-weight basis — see the USDA hemp program. THCA flower is sold under that rule. State laws differ and are changing, so check your state before you order. And whatever the label says, THCA flower will show up on a drug test — heated, it is THC.

Shop Premium Flower at Diesel Hemp

• Mule Fuel THCA Flower — our gassy, earthy, indica-leaning evening strain — the closest heavy-indica match to MK Ultra.
• THCA Flower — the full lineup, grown in Colorado by Diesel Hemp and partner farms.
• THCA Pre-Rolls — the same flower, pre-rolled.
• THCA Small Buds — same genetics, smaller nugs, better price per gram.
• What THCA flower actually is — the encyclopedia explainer.

Frequently Asked Questions

Is MK Ultra indica or sativa?

Indica. Leafly lists it as an indica, SeedFinder as mostly indica, and AllBud as a 70/30 indica-dominant hybrid. Its top effects — sleepy, relaxed, tingly — are classic indica.

What is MK Ultra a cross of?

OG Kush × G13. Breeder T.H.Seeds specifies an LA cut of OG Kush.

Who bred MK Ultra?

T.H.Seeds, the Amsterdam seed company. It's available as feminized and regular seeds, plus an autoflower called Auto MK-Ultra Kush.

Why is the strain called MK Ultra?

It's named after Project MKUltra, the CIA's Cold War-era mind-control research program. The breeder calls it a nod to the 1950s LSD experiments and describes the high as hypnotic. The strain has no other connection to the program.

How strong is MK Ultra?

Leafly lists 20% THC and AllBud 18%, with most listings around 19–22%. It feels stronger than those numbers suggest because it comes on fast and is heavily sedating.

What are the effects of MK Ultra?

Leafly users report sleepy, relaxed and tingly effects. The high opens with a quick, euphoric head lift and settles into a heavy, hypnotic body calm that often ends in sleep.

What does MK Ultra taste like?

Pine, earth and wood, with a pungent, skunky, hashy finish and a lemon edge on some batches. The breeder describes a very intense pine taste.

Is MK Ultra good for sleep?

For most people, yes — sleepy is its most-reported effect, and insomnia appears on the breeder's and AllBud's lists of reported uses. Use it at night.

Is MK Ultra good for anxiety?

About 32% of Leafly reviewers say it helps with anxiety and 39% with stress. Keep the dose low; dizziness is among its listed negatives.

Is MK Ultra good for beginners?

Not really. AllBud's reviewers warn it can be overpowering for new or low-tolerance users. If you try it, take one small puff and wait 15–30 minutes.

Did MK Ultra win a Cannabis Cup?

Yes. Leafly, SeedFinder and the breeder list 1st place Indica at the 2003 High Times Cannabis Cup in Amsterdam and 2nd place in 2004. The 2004 Indica Cup result also appears on Wikipedia's winners list.

Is MK Ultra the same as MK Ultra Black Ops?

No. Black Ops is a darker, denser selection or MK Ultra-derived line sold by several breeders, with pedigrees that vary. The original MK Ultra is T.H.Seeds' OG Kush × G13.

How long does MK Ultra take to flower?

About 8–9 weeks indoors per the breeder (SeedFinder lists around 58 days). It stays short at 100–120 cm and yields about 350 g/m².

Where can I buy MK Ultra THCA flower online?

MK Ultra isn't in the Diesel Hemp shop right now. The closest match is Mule Fuel THCA Flower — a GMO Cookies × Lurch cross with earthy, gassy funk and the same heavy, indica-leaning evening landing, from $65, third-party lab tested, with free shipping over $75. It's gassier than MK Ultra's pine; for a sweeter nightcap, try Blueberry Pancakes, from $24.

Related Strains

• OG Kush — the parent behind MK Ultra's pine and fuel.
• Hindu Kush — the mountain indica in OG Kush's family tree.
• Cannatonic — a high-CBD strain Leafly lists among MK Ultra's offspring.
• East Coast Sour Diesel — MK Ultra's partner in T.H.Seeds' Ultra Sour.
• Chemdawg — MK Ultra's partner in Cold Creek Kush.
• Mule Fuel — our closest in-stock heavy, gassy indica-leaning match.
• Master Kush — another classic sleepy, earthy indica.
• Bubba Kush — a sweeter, hashy nighttime indica.
• Northern Lights — the gentler indica icon in the same conversation.
• Browse the Full Diesel Hemp Encyclopedia