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Job's Tears as a Perennial Grain

This project aims to study the utility of Job's Tears (Coix lacryma-jobi) as a perennial grain in warm parts of the United States (Zones 9 and 10, possibly 8), and to attempt to find or develop strains that can survive in colder zones.

Job's Tears (called Hato Mugi, in Japanese) is an uncommon grain eaten traditionally from Africa to Japan. It is believed to originate in India, but is most popular as food and medicine in China and Japan. Most Job's Tears grown in this country is of the non-domesticated type, with rock-hard shells that can only be cracked with pliers or a hammer. The grain inside is edible, but very hard to get at. The domesticated "ma-yuen" type (Coix lacryma-jobi var. ma-yuen) can be cracked open with a couple strong human fingers or a normal threshing machine.

The plant resembles corn, but is smaller, often branched, and perennial in mild climates. Believed to originate in India, it is most popular in Japan and China. The flavor is sweet, nutty, and earthy, with a chewy texture similar to pearl barley (which it also physically resembles, but barley and Job's Tears are very different grasses). Water in which the grains have been boiled, after adding some sugar, is often drunk as a medicinal tea.

Very little research has been done into growing Job's Tears as a perennial to produce grain, largely due to the lack of commercial production of ma-yuen Job's Tears in the United States. While the ornamental type grows in as a weed in parts of the country, it's quite difficult to even find seeds for the domesticated type. We grew a few plants in 2015, from the only USDA accession of the ma-yuen type, and have just enough seeds to increase our stocks this coming season, but we recently received over a pound of viable seed which will be the basis for this project. In future years, we hope to experiment with other accessions of this under-utilized perennial grain.


Researcher background
See bio in "About" section.
Are you seeking volunteer growers or other types of volunteers?
Yes, seeking volunteer growers
How many volunteers do you need?
What will you ask volunteers to do?
Volunteers will be asked to grow two beds of Job's Tears (number of plants per bed will depend on their available space). One bed will be generously mulched with hay, while the other while receive no mulch, for its first winter. Volunteers will be asked to a similarly sized bed of control seeds the next year, to compare yields with perennial survivors. The main goal is to learn more about winter survival and how perennializing relates to yields.
Other requirements of volunteers?
Volunteers in USDA Zones 10 to 8 are sought, along with a few in Zones 6 and 7.
Is this a multi-year project?
Can volunteers expect to be able to keep some germplasm (seeds, bulbs, cuttings, spores, etc) at the close of the project?
Yes, of course
Researcher Location

United States

Project Updates

Non-Edible variety

project update by
Monday, January 3, 2022 - 03:18

I would love to be a part of this project... I tried growing Job's Tears last year and they produced great but then found out there were 2 kinds, and I had grown the rock hard inedible kind (Baker Creek). I can't find a source for the edible variety, and would love to trial it in my 7b garden. My family is celiac and I'm trying to explore gluten free grains. Thanks!