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Landrace.wiki
The open database for landrace cannabis populations, their genetics and the traditional knowledge that sustains them.
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ZOM-THA-PHU-1220240001
Lin Pooh General Population 2024 is a landrace cannabis accession collected by Éloïse and Isabella of the Zomia Collective in Sakhon Nakhon Province, Thailand.
Sex determination in cannabis
Sex determination in cannabis is the genetic and developmental process that establishes whether a Cannabis plant develops as male, female, or, in some cultivated forms, monoecious. Cannabis is normally dioecious: pollen-bearing (male) and seed-bearing (female) flowers form on separate individuals, and sex is set by a pair of heteromorphic sex chromosomes. Females carry two X chromosomes (XX) and males an X and a Y (XY), so the male is the heterogametic sex and the Y is transmitted only through pollen.
Chromosomal sex, fixed at fertilisation, is distinct from sex expression: the male or female character of the flowers a plant actually produces. Sex expression is labile: hormonal, chemical and environmental signals can shift a plant toward the opposite sex's flowers without altering its chromosomes, and a genetically female (XX) plant induced to shed pollen transmits only X-bearing gametes.
The distinction is central to cannabis cultivation and breeding. Because cannabinoids accumulate chiefly in the unpollinated female inflorescence, drug-type and cannabinoid-hemp crops are grown as all-female stands; monoecious cultivars underpin uniform fibre and seed hemp; and reliable early identification of a plant's chromosomal sex, before flowers appear, is a routine breeding and roguing task. For dioecious landrace populations, the obligate outcrossing that dioecy enforces also shapes mating structure and the maintenance of genetic diversity. read more →
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Cannabis eradications
We are witnessing the rapid disappearance of traditional cultivation knowledge and genetic diversity in cannabis. These landrace populations represent thousands of years of natural and human selection, containing unique genetic traits and chemical profiles. Systematic documentation and conservation efforts can serve as a bridge, preserving irreplaceable genetic heritage while supporting traditional communities and advancing our understanding of this remarkable plant.
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9 July 2026
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20:15 | Dioecy 4 changes history −1,561 [Eloise Zomia (4×)] | |||
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20:15 (cur | prev) −79 Eloise Zomia talk contribs (Copyedit: remove comma-before-and/or cadence (house no-Oxford-comma rule); strip 3 figure-placeholder markers now that the diagrams are uploaded) | ||||
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20:00 (cur | prev) −467 Eloise Zomia talk contribs (→Ecology and evolution of dioecy) | ||||
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19:56 (cur | prev) −493 Eloise Zomia talk contribs (→Environmental sex reversal) | ||||
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19:52 (cur | prev) −522 Eloise Zomia talk contribs (→Monoecy and continuous sex expression) | ||||
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20:12 | Genetic diversity 2 changes history +16,943 [Eloise Zomia (2×)] | |||
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20:12 (cur | prev) −60 Eloise Zomia talk contribs (Conform to house style: rewrite em-dash asides as commas/colons/parentheses; remove Oxford commas) | ||||
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20:03 (cur | prev) +17,003 Eloise Zomia talk contribs (Rewrite stub into cannabis-focused Population-Genetics article: 8 refs, Genetics series navbox, 4 figures, full link set) | ||||
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20:00 | (Upload log) [Eloise Zomia (3×)] | |||
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20:00 Eloise Zomia talk contribs uploaded File:Cannabis-dioecious-outcrossing.jpg (A male plant on the left and a female plant on the right, with pollen blowing from the male to the female, which then bears seed.) | ||||
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19:56 Eloise Zomia talk contribs uploaded File:Cannabis-chromosomal-vs-expressed-sex.jpg (A diagram with two parallel tracks for one plant: an upper fixed track marked XX or XY and a lower sliding track that moves between male and female, with an XX plant shifted toward male flowering producing X-only pollen and all-female seed.) | ||||
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19:53 Eloise Zomia talk contribs uploaded File:Cannabis-dioecy-monoecy-continuum.jpg (A horizontal scale from all-male on the left to all-female on the right, with a separate male plant and a separate female plant at the two ends and a single plant bearing both flower types placed in the middle.) | ||||
