- T.H. Seeds creation: G13 × OG Kush — two of the most storied genetics in cannabis history, G13 carrying legendary potency mythology and OG Kush contributing its definitive West Coast earthy-citrus-hash character.
- THC range 18–23% with a hypnotic, deeply sedating indica effect that users consistently describe as more mentally enveloping than other heavy indicas of similar THC percentage.
- High Times Cannabis Cup 1st Place winner in the indica category — one of a small number of indica strains to receive this recognition.
- Named after the MKULTRA mind control program — T.H. Seeds chose this name deliberately to reflect the strain’s uniquely hypnotic, consciousness-altering sedation quality.
- Dominant terpenes myrcene, limonene, and caryophyllene create an earthy-pine-citrus-hash complexity that is distinctive in the indica category.
- Compact OG Kush-influenced structure with very high resin density — excellent concentrate source alongside premium flower production.
- Indoor yield 350–400 g/m²; outdoor yield 400–500 g per plant. Intermediate grow difficulty; responds well to experienced training techniques.
Quick-Reference Data
| Attribute | Data |
|---|---|
| Breeder / Origin | T.H. Seeds (Amsterdam) |
| Genetics | G13 × OG Kush |
| Type / Ratio | Indica (predominantly indica) |
| THC Content | 18–23% |
| CBD Content | <1% |
| Dominant Terpenes | Myrcene, Limonene, Beta-Caryophyllene |
| Flowering Time | 56–63 days (indoor) |
| Indoor Yield | 350–400 g/m² |
| Outdoor Yield | 400–500 g per plant |
| Difficulty | Intermediate |
Genetics & Origin
MK Ultra was created by T.H. Seeds, the Amsterdam-based seed company founded by Adam Dunn and others responsible for producing some of the most influential genetics of the European cannabis industry. The cross of G13 and OG Kush represents the meeting of two strains surrounded by remarkable mythology and documented achievement in cannabis history.
G13 is arguably cannabis’s most mythologised strain. According to widely circulated legend, G13 was one of the most potent indica strains produced by a secret US government breeding program at the University of Mississippi in the 1970s, allegedly obtained by a technician who smuggled a single cutting. While the historical accuracy of this origin story is contested by cannabis historians, G13 as a commercially available cut does exhibit extraordinary indica potency and the deep, enveloping sedation quality that gave the legend its staying power. T.H. Seeds has worked with verified G13 genetics since the 1990s.
OG Kush, the other parent, needs less mythology — its achievement speaks directly. One of the most influential strains in cannabis history, OG Kush brought the definitive earthy-pine-citrus-hash terpene profile and the euphoric, body-heavy effect that defined West Coast cannabis culture from the mid-1990s onward. The cross of G13’s legendary indica depth with OG Kush’s terpene complexity and cerebral euphoria produced a strain T.H. Seeds named as a direct reference to the mind-altering character of the result.
Terpene Chemistry
MK Ultra’s terpene profile carries OG Kush’s fingerprint clearly: the myrcene-limonene-caryophyllene combination that defines OG Kush lineage strains. What distinguishes MK Ultra is the G13 influence on how these terpenes interact with the strain’s cannabinoid content — the overall effect is more total and enveloping than OG Kush alone, with the G13 genetics amplifying the sedating potential of the myrcene while the limonene preserves enough mental brightness to prevent the high from becoming simply blank.
| Terpene | Aroma Profile | Effect Contribution | Concentration |
|---|---|---|---|
| Myrcene | Earthy, hash-musky, herbal | Hypnotic body stone; profound muscle relaxation; THC potentiation | Primary |
| Limonene | Citrus, lemon-pine, bright | OG Kush-signature citrus brightness; mood elevation layer; prevents flat sedation | Primary |
| Beta-Caryophyllene | Pepper, spiced hash, wood | CB2 anti-inflammatory; adds the hash-spice characteristic of G13/OG lineages | Secondary |
| Alpha-Pinene | Fresh pine, resinous | OG pine note; mild cognitive clarity counterpoint to heavy myrcene sedation | Trace |
The limonene content is the key differentiator between MK Ultra and purely myrcene-dominant indicas like Super Skunk. OG Kush’s signature limonene contribution prevents MK Ultra’s sedation from becoming purely flat — there is a warm euphoric brightness that persists through the heavy body effect, creating the hypnotic quality where the mind is present but non-resistant, observing the sedation rather than fighting it. This is the characteristic that earned the strain its name: a state of mental openness within profound physical heaviness.
Effects: Onset, Peak & Duration
Onset — 0 to 10 Minutes
MK Ultra’s onset is fast and distinctive. Within 5 to 8 minutes of inhalation, users experience a pronounced shift in consciousness — the limonene-forward OG Kush inheritance delivers an immediate euphoric brightness that lifts mood sharply before the heavier indica genetics begin their work. The onset feels more total than incremental, arriving as a clear state change rather than a gradual accumulation.
Peak — 15 to 90 Minutes
The peak of MK Ultra is what justifies its name. The body is fully sedated: deep muscle relaxation, complete physical heaviness, and an absence of restlessness or agitation. But the mental dimension is what distinguishes MK Ultra from comparable indicas — rather than blankness, the mind enters a hypnotic state described by consistent users as a warm, enveloping dreaminess in which thoughts arise and pass without urgency, sensory experiences are heightened, and the usual cognitive chatter stops. This is profoundly restful for minds that cannot quieten under lesser indicas. It is the effect quality that earned the Cannabis Cup and the name.
Tail — 90 Minutes to 3.5 Hours
The MK Ultra comedown is a deep, slow fade into sleep. Most users do not maintain waking consciousness beyond 2 hours at moderate doses. The transition to sleep is seamless and the sleep quality is reported as restorative and deep. Morning residual effects are minimal at standard doses; heavy use may produce some morning fogginess that clears within 30 minutes of activity.
Flavour & Aroma Profile
MK Ultra smells of the OG Kush lineage with G13’s amplification: earthy, hash-like, and deeply pungent with citrus-pine brightness on top. The raw flower has a distinctive combination of earthy damp and sharp citrus that is immediately recognisable to experienced OG Kush consumers as a Kush-lineage descendant. On consumption, the flavour is rich and complex: earthy hash and spiced wood on the inhale, citrus pine and resin on the body, and a lingering hash-spice finish on the exhale. Dry herb vaporising at 185–200°C is the recommended method to fully express the limonene brightness before the higher-temperature myrcene and caryophyllene dominance.
Medical & Therapeutic Applications
- Severe insomnia: Among the most effective cannabis strains for sleep onset and maintenance — the hypnotic quality transitions directly to deep, restorative sleep.
- Severe chronic pain: High myrcene, caryophyllene CB2 activity, and 18–23% THC provides comprehensive pain relief for conditions resistant to milder strains.
- Treatment-resistant anxiety: The hypnotic, mind-quieting effect may address anxiety disorders where other strains produce insufficient mental calming.
- PTSD: The total quieting of mental hyperactivity and the direct path to restorative sleep are particularly relevant to PTSD symptom management.
- Muscle spasms and seizures: Full-body indica relaxation addresses spasticity and tension-related conditions comprehensively.
- Depression (evening use): The euphoric onset combined with profound relaxation provides a circuit-breaker for depressive thought patterns in the evening hours.
Growing MK Ultra: Complete Cultivation Guide
| Factor | Indoor | Outdoor |
|---|---|---|
| Flowering Time | 56–63 days | Late September to early October |
| Yield | 350–400 g/m² | 400–500 g per plant |
| Height | 60–90 cm (compact OG structure) | 80–130 cm |
| Difficulty | Intermediate | Intermediate |
| Climate | 20–26°C; RH 40–50% flower; excellent airflow | Warm, Mediterranean ideal; harvest before autumn rains |
| Training Response | Good — OG structure responds to experienced LST/SCROG | Topping in early veg broadens canopy effectively |
Indoor Cultivation
MK Ultra grows with the compact, manageable structure typical of OG Kush lineage strains. The G13 genetics contribute vigour and resin production; OG Kush contributes the dense bud structure that creates both the yield quality and the botrytis risk. Strong airflow, proper humidity management below 50% through all of flower, and spacing for canopy circulation are the key environmental requirements. T.H. Seeds’ MK Ultra is known for phenotype consistency, making it a reliable seed-to-harvest performer for experienced indoor growers. The resin density makes it an exceptional concentrate source — growers frequently designate a portion of harvest for rosin or ice-water hash production.
Outdoor Cultivation
MK Ultra performs well in warm, Mediterranean-type climates outdoors. The OG Kush genetics provide reasonable pest resistance; the G13 component contributes additional vigour in warm conditions. Late September to early October harvest in northern European or Pacific Northwest conditions is typical. The dense OG structure creates humidity risk in wet autumn conditions — earlier harvest at 80% trichome maturity may be appropriate in regions with unreliable autumn weather rather than waiting for full amber trichomes.
Consumption Methods
MK Ultra’s complex OG Kush-derived terpene profile rewards careful consumption. Dry herb vaporising at 185–200°C produces the fullest flavour expression and the cleanest hypnotic effect onset. Combustion delivers the complete earthy-hash OG character effectively. As a concentrate source, MK Ultra produces exceptional live resin and rosin — the full-spectrum terpene complexity of the G13/OG Kush cross expresses particularly well in low-temperature concentrate production. Edible administration delivers 5–7 hours of hypnotic sedation suitable for severe insomnia and chronic pain management overnight.
Similar Strains
| Strain | Type | THC | Key Difference from MK Ultra |
|---|---|---|---|
| OG Kush | Hybrid | 20–25% | More balanced hybrid effect; less hypnotic sedation; stronger cerebral component |
| G13 | Indica | 18–24% | Purer indica sedation; no OG citrus complexity; more purely earthy profile |
| Kimbo Kush | Indica | 20–24% | Berry-grape profile vs. earthy-citrus hash; comparable sedation intensity |
| Super Skunk | Indica-dominant | 17–20% | More skunky classic aroma; less OG complexity; faster flower; less THC ceiling |