NC State Extension
North Carolina Extension Gardener Plant Toolbox

Plant DetailShow Menu

Yi Yi Coix lacryma-jobi

Previously known as:

  • Lithagrostis lacryma-jobi
Phonetic Spelling
KOY LAH-krih-mah JOH-bee
Description

Job's tears is a tropical perennial grass native to Southeast Asia and is a member of the grass family (Poaceae). It may be grown as an annual or perennial, and has been naturalized in much of the southern United States, parts of South America, and Africa. It grows up to 3 to 6 feet tall, and its glossy, deep green leaf blades are wide, upright, and arching at the ends with coarse, slightly wavy edges. The plant forms short, grayish-white, drooping tassels that develop into a string of seeds. The fruit is borne on pendulous seedpods, and the seeds are small, initially green and changing to a whitish-gray blue or black. These seeds resemble pearls and are hard, shiny, and tear-shaped. They are used as a food source, for jewelry, and for traditional medicine. The genus name, Coix, is derived from the Greek word κόϊξ, referring to the doum palm. It is now accepted as a generic name for a genus of Asian grasses. The specific epithet lacryma-jobi is Latin and Hebrew in origin. The Latin word lacryma means tear, and the Hebrew word jobi is a genitive form of the Biblical character Job. The common name, Job's tears, refers to tear-shaped fruits.

This plant thrives in wet tropical climates with warm temperatures and high humidity. Prefers full sun and moist, well-drained, slightly acid, loamy soils. The soil should be consistently wet, but not soggy. It is perennial in zones 9 through 11, and can be propagated by seeds. 

Some varieties have seeds with hard pseudocarps and are used for jewelry, while others have softer pseudocarps and are used as cereal crops and in folk medicine. In the Cherokee Nation and the Eastern Band of Cherokee, the beads of Job's tears are used in personal attire.

This plant may be grown as a hedge or in a container.

Insects, Diseases, and Other Plant Problems: May be susceptible to short-winged grasshoppers, flea beetle, rice bug, green stink bug, leaf beetle, and weevils. Monitor for fungal diseases, such as leaf blight and smut.

See this plant in the following landscape :
Cultivars / Varieties:
  • var. ma-yuen
    A cultivated variety, soft pseudocarp; South China to peninsular Malaysia and the Philippines; grain crop and in medicine
  • var. puellarum
    Assam to Yunnan (China) and Indochina
  • var. stenocarpa
    Eastern Himalayas to Indochina
var. ma-yuen, var. puellarum, var. stenocarpa
Tags:
#full sun tolerant#bright green#ornamental grass#moist soil#glossy leaves#coarse#exotic looking#acidic soils tolerant#glossy fruits#wet soils tolerant#partial shade tolerant#container plant#annual#full sun#hedge
 
Cultivars / Varieties:
  • var. ma-yuen
    A cultivated variety, soft pseudocarp; South China to peninsular Malaysia and the Philippines; grain crop and in medicine
  • var. puellarum
    Assam to Yunnan (China) and Indochina
  • var. stenocarpa
    Eastern Himalayas to Indochina
var. ma-yuen, var. puellarum, var. stenocarpa
Tags:
#full sun tolerant#bright green#ornamental grass#moist soil#glossy leaves#coarse#exotic looking#acidic soils tolerant#glossy fruits#wet soils tolerant#partial shade tolerant#container plant#annual#full sun#hedge
  • Attributes:
    Genus:
    Coix
    Species:
    lacryma-jobi
    Family:
    Poaceae
    Uses (Ethnobotany):
    Used as a grain crop, animal food, medicine, and to make jewelry such as necklaces and rosary beads. In Chinese medicine, it is used to treat neuralgia, rheumatism, and inflammation.
    Life Cycle:
    Annual
    Perennial
    Recommended Propagation Strategy:
    Seed
    Country Or Region Of Origin:
    Indian Subcontinent to Taiwan and Malaysian Peninsula
    Distribution:
    Native: Assam, Bangladesh, Borneo, Cambodia, China South-Central, China Southeast, East Himalaya, India, Laos, Malaysia, Myanmar, Nepal, Philippines, Sri Lanka, Taiwan, Thailand, Tibet, Vietnam, and West Himalaya. Introduced: Algeria, Angola, Argentina, Bolivia, Brazil, Cape Provinces, Central African Republic, China North-Central, Colombia, Congo, Costa Rica, Cuba, Dominican Republic, Ecuador, Egypt, El Salvador, Ethiopia, France, Gambia, Germany, Greece, Guatemala, Haiti, Honduras, Inner Mongolia, Iraq, Italyy, Jamaica, Japan, Kenya, Korea, Liberia, Madagascar, Manchuria, Mexico, Nicaragua, Nigeria, North Caucasus, Northern Provinces, Panama, Paraguay, Peruk, Puerto Rico, Saudi Arabia, Spain, Suriname, Tanzania, Togo, Tonga, Turkey, Uganda, Venezuela, Xinjiang, and the United States--Hawaii, Louisana, New Jersey, New York, Ohio, Pennsylvania, and Tennessee.
    Edibility:
    Used as a cereal grain. In Southeast Asia, the grain is used to make alcohol and a milk-like drink.
    Dimensions:
    Height: 3 ft. 0 in. - 6 ft. 0 in.
    Width: 0 ft. 6 in. - 2 ft. 0 in.
  • Whole Plant Traits:
    Plant Type:
    Annual
    Ornamental Grasses and Sedges
    Perennial
    Texture:
    Coarse
  • Cultural Conditions:
    Light:
    Full sun (6 or more hours of direct sunlight a day)
    Soil Texture:
    Loam (Silt)
    Soil pH:
    Acid (<6.0)
    Soil Drainage:
    Good Drainage
    Moist
    Occasionally Wet
    Available Space To Plant:
    Less than 12 inches
    USDA Plant Hardiness Zone:
    9a, 9b, 10a, 10b, 11a, 11b
  • Fruit:
    Fruit Color:
    Black
    Brown/Copper
    Gray/Silver
    Fruit Value To Gardener:
    Edible
    Showy
    Display/Harvest Time:
    Fall
    Fruit Type:
    Caryopsis
    Fruit Length:
    < 1 inch
    Fruit Width:
    < 1 inch
    Fruit Description:
    The caryopsis encloses the female flower and the grain. The grain is tear-shaped, hard, and round with a shiny, dark brown to grayish-black hull, measuring about 0.3 inches in diameter.
  • Flowers:
    Flower Color:
    Blue
    Green
    Flower Inflorescence:
    Insignificant
    Spike
    Flower Value To Gardener:
    Good Cut
    Good Dried
    Flower Bloom Time:
    Fall
    Summer
    Flower Size:
    < 1 inch
    Flower Description:
    The flower spikes are peduncled, erect, and 2.5 to 4 inches long. The male spikelets are up to 0.3 inches long. Monoecious– flowers are of different sexes, but individual plants produce both. Blooms from July to September.
  • Leaves:
    Leaf Color:
    Green
    Leaf Feel:
    Glossy
    Rough
    Leaf Shape:
    Linear
    Oblong
    Leaf Margin:
    Undulate
    Hairs Present:
    No
    Leaf Length:
    > 6 inches
    Leaf Width:
    < 1 inch
    Leaf Description:
    The leaves are deep green, glossy, linear to oblong, heart-shaped at the base, tapering at the tips, usually glabrous, measuring 4 to 18 inches long and 0.5 to 1 inch wide. The sheath is about 2.5 inches long and smooth. The margins of the leaf blades are coarse and slightly wavy.
  • Stem:
    Stem Is Aromatic:
    No
    Stem Description:
    The stem is erect, coarse, and stout. Grows 3 to 6 feet tall.
  • Landscape:
    Landscape Location:
    Container
    Design Feature:
    Hedge