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Landrace.wiki

The encyclopedia and open conservation database for landrace cannabis populations, their genetics and the traditional knowledge that sustains them.

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The landrace map

Accessions, coloured by the status of their seed lots, with growing places and archaeological sites. Another 571 accessions have no coordinates yet.

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Interactive map of landrace accessions, growing places and archaeological sites. It is unavailable here; browse the accession list instead.

1144Accessions shown

87Growing areas

45Growing regions

Seed lot status

UrgentAt riskSecureHeld in a genebank, not distributedNo data yet, or too little to rateWhat these mean

364of the 1144 accessions on this map have a seed lot rated Urgent. See which populations to grow out first

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An accession is a sample or observation recorded at a specific place and time.

All accessionsEvery documented sample and observation

ClassificationLandrace, feral, specimen and related accession types

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Growing regionA broad ecological and cultural grouping

Growing areaA specific cultivation zone within a region

AppellationA recognised name tied to place and tradition

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Grow-out prioritiesPopulations to collect or grow out first

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Featured accessionMaxwell 97-797 (1997)

Thailand Collected 1997 Herbarium specimen

Maxwell 97-797 is a herbarium accession of Cannabis sativa collected near Pah Dang, a red Lahu village in Geut Chang subdistrict, Mae Taeng District, Chiang Mai Province, northern Thailand, on 30 July 1997 by J.F. Maxwell. The California Academy of Sciences holds a sheet as catalogue 1781016, published by GBIF as preserved specimen occurrence 6408927556. The Forest Herbarium (BKF) in Bangkok holds a duplicate as accession BKF 121956, barcode SN 118283.

CollectionHerbarium specimenHistorical

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Places

Featured growing regions and areas

Growing region

Eastern Ghats

India

Hill districts on both sides of the Andhra Pradesh–Odisha border where cannabis is grown for ganja

Chamarajanagar

Karnataka · India

Chamoli

Western Himalayas · India

Champasak

Southern Laos · Laos

Changzhi

Shanxi · China

All 48 growing regions · All 96 growing areas

A cannabis plant in flower photographed close up, its leaves and bracts sharp against a blurred green hillside

Picture of the day

Landrace cannabis cultivated by locals in the village fields of Atolang.

Atolang (appellation) · Éloïse, 13 October 2022 · About this photograph

Featured article

Pillai legiyam is a preparation of ganja fried in ghee, strained and mixed with sugar, recorded in the Madras Presidency. L. C. Miller, the acting collector of Trichinopoly, listed it in 1893 among the ganja preparations eaten in his district, in his evidence to the Indian Hemp Drugs Commission. In 1957 I. C. and R. N. Chopra gave the same description of it among the special ganja preparations of Madras, with purnadhi legiyam, majiyam and purnadhi.

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Research

Venue: Agriculture and Natural Resources

30 Sep 2026

Comparison of self-pollination and intercrossing for feminized seed production in Thai Hang Kra Rok cannabis (Cannabis sativa L.) landrace

Compares selfing with intercrossing for producing feminized seed from two Thai landrace accessions of Hang Kra Rok cannabis, one from Bangkok and one from Sakon Nakhon. Female cuttings were treated with colloidal silver to induce male flowers, and the progeny were grown in a plant factory with artificial lighting. Both selfed lines and the Sakon Nakhon by Bangkok cross gave 100% female plants, while the reciprocal cross produced one hermaphrodite (5.6%). Dry inflorescence weight did not differ between treatments. The Bangkok selfed line had the highest THC content at 6.58%. The plants were grown under artificial light, so the chemistry is not field chemistry.

Source

29 Sep 2026 · Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy

Tracing the roots of illicit Cannabis: A machine learning-assisted ATR-FTIR proof-of-concept study for geographical origin classification

Source

26 Sep 2026 · Transformation: Critical Perspectives on Southern Africa

Cross of Green: Substance and Value in South Africa's Shifting Cannabis Policy

Source

23 Sep 2026 · Journal of Ethnopharmacology

Standardized Curcuma longa–Cannabis sativa extract derived from a traditional Thai formulation for psoriasis: anti-inflammatory activity, keratinocyte modulation, and skin-targeted delivery

Source

20 Sep 2026 · Journal of Essential Oil Research

Dynamic changes in essential oil yield and terpenoid composition across growth stages in hemp cultivars