Re: Are the Effects of Landraces Really So Different from Modern Cannabis?

V1.0 Eloise | March 2026

A response to the Real Seed Company's blog post of February 18, 2026.

The Real Seed Company recently asked whether the effects of landraces are really so different from modern cannabis. Their answer was an emphatic yes and we agree. Anyone who has smoked a proper ganja landrace from Laos or Orissa alongside a dispensary cookie-cutter 25% THC cultivar knows the difference is not subtle. It is not a matter of opinion or placebo. The experiential gap is enormous and thousands of smokers across decades will tell you the same thing.

We also agree that five decades of single-minded breeding for THC percentage has produced a chemically impoverished cannabis monoculture. A 2022 analysis of over 90,000 commercial cannabis samples across six US states confirms this: the legal market has converged on a narrow band of chemical profiles and commercial labels like "indica" and "sativa" do not reliably predict actual chemical composition (Smith et al., 2022, PLOS ONE). The diversity that once defined cannabis is being commercially flattened.

But there is a point the conversation around landraces consistently fails to address, one that should concern every serious grower, collector and conservationist. And, oddly enough, it is a point that RSC's own post makes the case for while simultaneously arguing against it.

Two premises, no conclusion

Consider these quotes from RSC's post:

Don't let 'idiot-farming' grifters on forums throw you with half-baked, half-understood puff about terroir...Yes, it is true that, as with a crop such as tea, altering an environmental factor such as altitude can cause even a clonal cannabis cultivar to exhibit very marked changes in relative expression and concentration of secondary metabolites...But all this is about terroir and does not change the facts of the genetics: landraces are landraces and genomics work is indicating that their populations are very well-defined at the genetic level.

Two concessions are buried in there:

1. Genetics are real. Genomics confirms that landrace populations are well-defined at the genetic level.

2. Terroir is real. Environmental factors like altitude measurably alter secondary metabolite expression, even in clonal cultivars.

These are the two pillars of an appellation system. The post describes the foundational framework, then dismisses people trying to articulate it as grifters.

In Burgundy, wines are most often differentiated at the level of individual, named fields (French: Lieux-dit). In some exceptional vineyards such as the Grand Cru 'Clos de Vougeot' (pictured), winemakers informally distinguish between individual parcels and rows within the vineyard.

Every other traditional crop figured this out centuries ago

An appellation is a system for documenting the relationship between a product, its genetics and its place of origin. It is the framework that distinguishes Champagne from sparkling wine, Darjeeling from generic black tea, Parmigiano-Reggiano from parmesan and Scotch from whisky. It is one of the oldest and most legally robust concepts in agricultural documentation. It predates the cannabis industry by centuries.

The principle is straightforward: genetics and terroir are not competing explanations.

They are complementary layers that together define what makes a traditional agricultural product what it is. Pinot Noir does not stop being Pinot Noir when you grow it in Oregon. But nobody calls Oregon Pinot Noir "Burgundy," because the appellation denotes both the genetics and the place. The grape is the grape. The terroir is the terroir. The appellation holds them together.

As this graphic demonstrates, 'Terroir' is not a terribly hard concept to understand. Credit & Copyright: Winefolly

Angus uses Skunk No. 1 as an analogy:

would anyone argue that Skunk No. 1 is not Skunk No. 1 if it is not in Amsterdam or the California desert?

Of course not.

Skunk No. 1 is a stabilised hybrid. It is genetically uniform. It has no appellation because it has no meaningful relationship to geography. No sense of place when you consume it. No tradition behind it. You can grow it anywhere and get essentially the same thing, which is precisely the point of modern breeding.

A landrace is the opposite.

Landraces are genetically diverse, dynamic populations shaped by centuries of co-adaptation between genetics, local environment and farmer selection. It is, by definition, a product of place. The genetics encode what the population can express. The terroir determines what it does express.

The farmer, through generations of interaction with the plant within that specific environment, has shaped both.

Comparing a landrace to Skunk No. 1 to argue that place does not matter is like comparing Champagne to Coca-Cola and concluding that terroir is irrelevant to beverages.

Upper 'Kutla' fields of Tosh Village in the Parvati Valley of Himachal Pradesh - India (2022)

What happens when a landrace leaves its appellation

When a landrace population is collected and reproduced outside its region of origin, the resulting population is no longer subject to the evolutionary forces that created it. The terroir has changed. The farmer selection pressures have changed. Critically, the population size has almost always been reduced, which introduces well-documented genetic consequences.

A study of common bean (Phaseolus vulgaris) landraces found that even with population sizes of 120 plants per reproduction cycle, far larger than typical cannabis seed company runs, ex situ multiplication produced measurable genetic bottleneck effects, including loss of rare alleles (Negri & Tiranti, 2010). A 50-year longitudinal comparison of Mexican maize landraces found that while genome-wide diversity was broadly similar between in situ and ex situ populations, in situ populations showed ongoing evolution at specific loci linked to farmer selection criteria, evidence of active adaptation that ex situ populations had lost (McLean-Rodríguez et al., 2021, Heredity).

Cannabis-specific longitudinal data at this resolution does not yet exist, a consequence of prohibition stunting conservation genetics by decades compared to food crops. At the same time, the underlying principles are universal to outcrossing plant populations.

When anyone reproduces a landrace ex situ, three things happen:

Visual representation of genetic bottlenecks

Sampling bottleneck. Only a fraction of the source population's allelic diversity is captured in any collection event. Rare alleles, which may encode locally adapted traits, are disproportionately lost. Modelling of realistic population systems has shown that the long-standing "rule of thumb" of 50 individuals per population is often insufficient to capture low-frequency alleles and that appropriate minimum sample sizes depend heavily on species biology and population structure (Hoban, 2019, Biological Conservation).

Visual representation of the different types of natural selection

Selection pressure shift. The reproduction environment imposes different selective pressures than the region of origin. Altitude, photoperiod, temperature, humidity, soil chemistry and pathogen communities all differ. The genotypes that thrive in a lowland reproduction facility are not necessarily the genotypes that perform best at 2,000 metres in the Himalaya. In the bean landrace study cited above, differentiation among farmer subpopulations increased when multiplication took place outside the adaptation area and neutrality tests detected selective effects at loci involved in pathogen response (Negri & Tiranti, 2010).

Cessation of adaptive evolution. In situ landrace populations are not static genetic archives. They are living systems continuously evolving under farmer selection and environmental pressure, constituting complex coevolving sociobiological systems in which crop, environment and human management interact across spatial scales (Bellon et al., 2017, Evolutionary Applications). Ex situ reproduction freezes this process. The result is a snapshot of the population at the moment of collection, not the population as it exists and continues to develop in its place of origin. The maize longitudinal study cited above provides direct evidence: loci under active selection in situ, linked to farmer preferences for kernel width and ear size, showed no corresponding selection signal in ex situ samples from the same source populations (McLean-Rodríguez et al., 2021).

This does not make reproductions worthless, far from it. For many threatened populations, reproduced seed stock is the only accessible form of conservation. Without reproductions, many landraces would surely be lost.

A reproduction is not a point-of-origin accession and presenting them as equivalent obscures a very important distinction.

In every other traditional crop industry, this distinction is considered foundational. The concept that holds it together is the appellation.

The term for the two categories is autochthonous (a population in its place of origin) and allochthonous (a population that has been moved elsewhere).

The question any buyer should ask of any landrace seed, from any vendor, is straightforward: is this an autochthonous accession or an allochthonous reproduction and how is that documented?

Guerrilla growing landrace cannabis farm deep in the Yala National park, where the biggest pest is elephants!

The pharmacology is catching up

It may sometimes be implied in the landrace community that the phytochemical basis for the difference between landrace and modern cannabis effects is settled science. It is not, quite, though it is heading in that direction.

Cannabis produces a complex ensemble of cannabinoids, terpenes, flavonoids and other secondary metabolites and there is strong reason to believe these compounds interact to shape the overall experience. A 2023 study comparing outdoor and indoor cannabis from identical genetic stock found that outdoor plants expressed significantly greater terpene diversity, including higher levels of sesquiterpenes, demonstrating that growing environment substantially shapes the chemical profile even within the same genetics (Calvi et al., 2023, Molecules). The genomic picture is also becoming clearer: a 2025 cannabis pangenome built from 193 genomes confirmed high structural variation across geographic origins and use types (Lynch et al., 2025, Nature) and population genomics studies of wild Iranian cannabis have identified distinct genetic clusters corresponding to geographic and climatic zones (Babaei et al., 2025, BMC Plant Biology).

A 2024 systematic review of the entourage effect concluded that while the synergistic framework is plausible and clinically suggestive, robust clinical trial evidence for specific compound interactions remains limited (Ferrão et al., 2024, Pharmaceuticals). This does not invalidate what smokers experience. It means the science is catching up to what the community already knows and that anyone making pharmacological claims should be honest about where the evidence currently stands.

The experiential case for landrace diversity does not need the pharmacology to be fully resolved. The conservation case is even simpler: these populations represent irreplaceable genetic resources and they are disappearing. The mechanistic details will follow. The genetics will not wait.

Landrace cannabis being burned in Sri Lanka following a successful eradication campaign conducted by the Sri Lankan army (2026)

Documentation over argument

The question is not whether landraces are different from modern cannabis. They obviously are and cannabis is no exception to the documentation standards every other traditional crop takes for granted.

The question is whether we are going to document those differences with the precision they deserve, or get mad at people arguing about it on forums.

The former will require citations.

References

• Babaei, M. et al. (2025). Population genomics of a natural Cannabis sativa L. collection from Iran identifies novel genetic loci for flowering time, morphology, sex and chemotyping. BMC Plant Biology, 25:80.

• Bellon, M. R. et al. (2017). In situ conservation—harnessing natural and human-derived evolutionary forces to ensure future crop adaptation. Evolutionary Applications, 10(10), 965-977.

• Calvi, L. et al. (2023). Comparison of the Cannabinoid and Terpene Profiles in Commercial Cannabis from Natural and Artificial Cultivation. Molecules, 28(2), 833.

• Ferrão, C. et al. (2024). The Entourage Effect in Cannabis Medicinal Products: A Comprehensive Review. Pharmaceuticals, 17(11), 1543.

• Hoban, S. (2019). New guidance for ex situ gene conservation: Sampling realistic population systems and accounting for collection attrition. Biological Conservation, 235, 199-208.

• Lynch, R. C. et al. (2025). Domesticated cannabinoid synthases amid a wild mosaic cannabis pangenome. Nature, 643, 1001-1010.

• McLean-Rodríguez, F. D. et al. (2021). Genetic diversity and selection signatures in maize landraces compared across 50 years of in situ and ex situ conservation. Heredity, 126, 913-928.

• Negri, V. & Tiranti, B. (2010). Effectiveness of in situ and ex situ conservation of crop diversity. Genetic Resources and Crop Evolution, 57, 387-398.

• Ren, G. et al. (2021). Large-scale whole-genome resequencing unravels the domestication history of Cannabis sativa. Science Advances, 7(29), eabg2286.

• Smith, C. J. et al. (2022). The phytochemical diversity of commercial Cannabis in the United States. PLOS ONE, 17(5), e0267498.