MK Ultra is T.H. Seeds' OG Kush x G-13 cross, and it is one of the few early-2000s indica-dominant hybrids whose breeder still publishes its competition record: first place at the 2003 High Times Cannabis Cup and second place in 2004. Expect pine-forward kush, earthy citrus and a heavy, sedating close.
Where It Comes From
MK Ultra belongs to the Amsterdam seed-company era, when American OG genetics were moving into Dutch breeding programs and the High Times Cannabis Cup was the scene's main scoreboard. T.H. Seeds bred and released it, and the 2003 placement is what put it on the map — a documented result, not retroactive folklore.
T.H. Seeds' current strain page still publishes both finishes, plus multiple recognitions since that the page does not itemize. Two decades of turnover in the seed market have not knocked it out of the catalogue, which is rarer than it sounds.
It is also a useful marker for how the business changed. In 2003 a cup placement was the whole marketing plan; today the same cultivar would need a brand, a drop and a waiting list. MK Ultra never had those and survived anyway.
The Cross
The genetics are OG Kush x G-13, published by T.H. Seeds. OG Kush is the well-documented half — fuel, pine, lemon, earth and the dense resinous structure that defines the West Coast family.
G13 is the other half, and it is where honest coverage has to stop short. G13 carries a long-running story about a government breeding program and a clone smuggled out of a federal facility. That story has never been documented. Describe G13 as a storied, widely circulated indica clone of uncertain origin, and do not repeat the legend as history.
T.H. Seeds gives four descriptors and they are the most reliable ones on record: pine-forward kush, earthy citrus, pungent and a resinous finish. That is a savory profile rather than a dessert one — soil and gas underneath, lemon and wood on top.
The breeder lists an 8–9 week indoor flowering window and yields of 350g+ per square metre. A short flower time on a mostly-indica structure is what produces the compact, dense, heavily frosted buds MK Ultra is usually shown as. Phenotype and environment still decide how much of that citrus survives the cure.
T.H. Seeds describes the arc as a euphoric onset and mood lift, an appetite increase, then a hypnotic calm and a deep, sleepy finish — an evening cultivar in most people's hands. Onset and intensity depend on dose, tolerance, format and setting, and no THC percentage belongs to the name.
What It Left Behind
The verified record: T.H. Seeds publishes a first-place finish at the 2003 High Times Cannabis Cup and a second-place finish in 2004 for MK-Ultra. Those placements are a large part of why the name survived, and the cultivar sits in T.H. Seeds' active feminized catalogue rather than as a legacy listing.
Be careful with the name on modern menus, where "MK Ultra" gets applied loosely to unrelated heavy indicas trading on the association. The T.H. Seeds cross is the one with receipts behind it.
The High Rise Take
MK Ultra is T.H. Seeds' OG Kush x G-13: pine, earth, citrus and gas, with a euphoric opening that gives way to sedation. Verify you are buying the T.H. Seeds line, not a name borrowed for shelf appeal.