North America (specifically the United States and Canada) is unique in the cannabis saga because it’s one region where cannabis is not native, yet nearly all modern strains ultimately converged. Cannabis first came to North America with European settlers in the form of hemp. In the 1600s–1700s, British and French colonists in Canada and Virginia grew hemp for rope and cloth. Early American figures, including George Washington and Thomas Jefferson, famously cultivated hemp. These plants were low-THC cultivars from Europe (and indirectly, from Chinese lineage), grown in fields for fiber. While there are anecdotes that colonial Americans knew about psychoactive uses, marijuana as a drug didn’t become culturally significant in the U.S. until much later.
By the late 19th century, cannabis extracts (often made from imported Indian hemp, Cannabis indica) were present in U.S. pharmacies as medicinal tinctures. But smoking cannabis recreationally only took off in the early 20th century, largely due to immigration from Mexico and the Caribbean. During and after the Mexican Revolution (1910–1920), many Mexicans moved into the southwestern U.S., bringing the custom of smoking marihuana for relaxation. Similarly, sailors and laborers from Caribbean islands like Jamaica introduced “ganja” in port cities like New Orleans and New York. Thus, by the 1920s and 30s, there was a small but notable presence of cannabis use in North America, tied to those communities and jazz subculture. The marijuana grown or supplied was initially a Mexican or Caribbean landrace product.
North America’s climate in many parts can support outdoor cannabis, and indeed, some early wild populations of hemp (ditch weed) established themselves in the Midwest from the days of hemp farming (these feral plants still exist, with very low potency). But for high-THC cannabis, the first major wave of cultivation was illicit and small-scale, meeting local demand. A turning point came in the 1960s and 70s during the counterculture movement. As interest in cannabis exploded among the youth, smuggling networks sprang up to bring in marijuana from abroad, especially Mexico, Jamaica, and Colombia. North America at this time didn’t yet have its own “landrace” (aside from those feral hemps), so it relied entirely on imported weed. However, the high risk of smuggling and intermittent shortages spurred some enterprising cannabis enthusiasts to start growing their own.
Initially, these early growers in places like California, Hawaii, and the Pacific Northwest used seeds that came in brick weed from Mexico or Colombia. Planting those, they were effectively growing the Mexican and Colombian landraces on U.S. soil. In Hawaii’s case, the tropical climate allowed even Southeast Asian strains (brought by surfers or soldiers on R&R from Vietnam) to flourish, leading to famous Hawaiian cultivars like Maui Wowie, Kona Gold, and Kauai Electric in the 1970s. These Hawaiian strains could be considered North American landrace cultivars, in that they were developed on American soil from imported landrace stock; Hawaii’s isolation and unique climate allowed them to stabilize. For example, Maui Wowie started as likely a Thai or other Pacific landrace in the late ’60s, and by the ’70s it was known as a distinct strain with a fruity tropical terpene profile and great potency, grown on the island of Maui.
On the mainland U.S., particularly in California’s Emerald Triangle (Humboldt, Mendocino, Trinity counties) and in pockets of the Appalachians, Midwest, and Pacific Northwest, the 1970s saw a proliferation of homegrown cannabis. At first, these were essentially local landrace-adapted populations of Mexican/Colombian (often called “homegrown” dismissively, as they were seeded and considered lower quality than imports). But a revolutionary shift occurred when Americans began obtaining indica seeds from Afghanistan and Pakistan in the mid-1970s. Travelers on the Hippie Trail and later some returning Vietnam veterans (who may have picked up Thai or Indian seeds) brought back a treasure trove of genetics. Suddenly, North American growers had access to Afghan indicas and Asian sativas which, when crossed with the existing Mexican/Colombian lines, could produce hybrid plants more suitable for temperate climates and indoor setups.
This marked the birth of modern cannabis breeding. Pioneers like the Haze Brothers and Sam the Skunkman in California, and later breeders in the Netherlands (who were often Americans avoiding prosecution), took these global landraces and hybridized them. They aimed to combine the best traits: e.g., the mind-blowing high of a Colombian or Thai sativa with the shorter flowering time and denser buds of an Afghan indica. The very first famous hybrid strains — Skunk #1, Original Haze, Northern Lights, Early Girl, etc. — were direct products of this intermixing of landraces from different regions. Skunk #1 (developed in California in the late '70s) combined Afghan indica, Mexican sativa, and Colombian gold genetics, resulting in a fast-flowering, pungent, and potent strain that was far more predictable than any wild landrace. Likewise, Haze was a complex hybrid of multiple sativas (including Colombian, Mexican, South Indian, and Thai), created to push the envelope of psychoactive effects.
None of these would have been possible without the co-evolutionary steps that came before: humans had carried those landraces across oceans and maintained them, and now a new generation of humans recombined them. In doing so, North America didn’t exactly create new landraces (because these hybrids were intentional crosses, not naturally evolved in isolation), but it did create a melting pot of cannabis genetics. Over the 1980s and 90s, this melting pot, fueled by clandestine breeding programs in the U.S., Canada, and the Netherlands, gave rise to the dizzying array of “strains” we know today.
Interestingly, if we talk of North American landraces, the only ones that fit the traditional definition might be: feral hemp (descended from colonial hemp, now adapted to wild fields of Midwest) and Hawaiian landraces (e.g., Maui Wowie family, which arguably acclimatized over a couple of decades to become its own stable line). Some also consider certain early Canadian outdoor strains like “Texada Timewarp” or “Matanuska Thunderfuck (Alaskan)”, but those were likely hybrids or selections from imported genes rather than ancient landraces.
The late 20th-century War on Drugs inadvertently accelerated cannabis evolution in North America in two ways. First, suppression of imports (through border crackdowns and crop eradication abroad) forced consumers to cultivate locally, meaning imported landrace seeds were planted and adapted on North American soil as never before. Second, enforcement pressure led to the rise of indoor growing, which in the 1980s was a new frontier. Indoor cultivation demanded plants that were short, quick, and amenable to artificial lights. This strongly favored indica-dominant genetics. As a result, many pure sativa landraces fell out of favor (taking too long or growing too tall for indoor closets), while indica or indica-sativa hybrids became the norm. The genetic balance of the global cannabis pool thus shifted – a clear human-driven selection on a continental scale.
By the turn of the 21st century, virtually all cannabis in North America was a hybrid of some sort. Yet the legacy of the landraces remained in those plants’ parentage and in the names that hinted at their origin (e.g., Afghani, Thai, Skunk, Kush, and Haze are all references to source landraces or their traits). In recent years, legalization in parts of the U.S. and Canada has sparked interest in “landrace preservation.” Some growers now specifically seek out pure seeds of Colombian, Mexican, Thai, Afghan, etc., to grow these historical varieties for posterity and for unique effects that modern hybrids might lack.
In conclusion, North America’s cannabis narrative is one of convergence and innovation rather than native co-evolution. The co-evolution happened elsewhere; North America became the grand laboratory where those globally derived strains were purposefully recombined. It’s a fitting final chapter to the co-evolution story: a once-wild Asian plant, spread by humans around the globe, was reunited in North America in a kaleidoscope of forms, coming full circle from wild landrace to cultivated hybrid and beyond. Today’s cannabis cultivars are a genetic tapestry woven from the contributions of countless regions and peoples, and understanding that all American weed ultimately has African and Asian roots fosters appreciation for the diverse cultures that nurtured the plant through the ages.
Ren G, Zhang X, Li Y, et al. Large-scale whole-genome resequencing unravels the domestication history of Cannabis sativa. Science Advances. 2021;7(29):eabg2286. doi:10.1126/sciadv.abg2286.
Clarke RC, Merlin MD. Cannabis: Evolution and Ethnobotany. University of California Press; 2013.
McPartland JM, Hegman W, Long T. Cannabis domestication, breeding history, present-day genetic diversity, and future prospects. Critical Reviews in Plant Sciences. 2019;38(4):327-352.
Merlin MD. Man and Marijuana: Some Aspects of Their Ancient Relationship. Fairleigh Dickinson University Press; 1972.
Warf B. High Points: An Historical Geography of Cannabis. Geographical Review. 2014;104(4):414-438.
Abel EL. Marihuana: The First Twelve Thousand Years. Plenum Press; 1980.
Sensi Seeds. Cannabis in Angola – Laws, Use, and History. Sensi Seeds blog. Published 2019. Accessed May 2025. (Documentation of Angolan slaves introducing cannabis to Brazil in 16th century.)
Leafly. Jamaica’s Cannabis Roots: The History of Ganja on the Island. Leafly News. Published 2018. Accessed May 2025. (Details on indentured Indians bringing cannabis to Jamaica and the term “ganja.”)
Olivastu. Cannabis Landrace Strains – Origin and Complete Strain List. Olivastu Olipedia. Published 2021. Accessed May 2025. (List of notable landrace strains by region and traits.)
Veriheal. Cannabis and the Mystical Tale of the Hippie Trail. Veriheal Blog. Published April 13, 2021. Accessed May 2025. (Discussion of how hippie travelers collected landrace seeds from Asia in the 1960s–70s and spread them globally.)