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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.

The landrace map

Accessions, coloured by the status of their seed lots, with growing places and archaeological sites. Another 558 accessions have no coordinates yet.

Interactive map of landrace accessions, growing places and archaeological sites. It is unavailable here; browse the accession list instead.
Seed lot status
UrgentAt riskSecureHeld in a genebank, not distributedNo data yet, or too little to rateWhat these mean
364of the 1101 accessions on this map have a seed lot rated Urgent. See which populations to grow out first
Places
Growing region
Brahmaputra Valley
India
The plains districts of Assam along the Brahmaputra, where the hemp plant grows round homesteads and cannabis is destroyed on chars and sandbars
Jalori
Western Himalayas · India
Jalpaiguri
North Bengal Plains · India
Jalpaiguri Dooars
The Dooars · India
Jamuna chars
North Bengal Plains · Bangladesh
A black and white photograph of workers moving in a line through a field of cannabis, carrying cut plants
Picture of the day
"Gathering the ganja crop, Naogaon", 16 February 1894 — a plate from the report of the Indian Hemp Drugs Commission.
Research

Latest publications

Venue: Agriculture and Natural Resources
30 Sep 2026
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.
Map of reported cannabis events. The interactive map is unavailable here; see the current events portal instead.
New here

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Learn what an accession is, how to read its fields and maps, and what the status of its seed lot means.

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