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Barley (Hordeum vulgare) - United States National Arboretum - 24 May 2009.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Genus: Hordeum
H. vulgare
Binomial name
Hordeum vulgare
Synonyms [2]
    • Frumentum hordeumE.H.L.Krause nom. illeg.
    • Frumentum sativumE.H.L.Krause
    • Hordeum aestivumR.E.Regel nom. inval.
    • Hordeum americanumR.E.Regel nom. inval.
    • Hordeum bifariumRoth
    • Hordeum brachyatherumR.E.Regel nom. inval.
    • Hordeum caspicumR.E.Regel nom. inval.
    • Hordeum coeleste(L.) P.Beauv.
    • Hordeum daghestanicumR.E.Regel nom. inval.
    • Hordeum defectoidesR.E.Regel nom. inval.
    • Hordeum durumR.E.Regel nom. inval.
    • Hordeum elongatumR.E.Regel nom. inval.
    • Hordeum gymnodistichumDuthie
    • Hordeum heterostychonP.Beauv. [Spelling variant]
    • Hordeum hexastichonL.
    • Hordeum hibernaculumR.E.Regel nom. inval.
    • Hordeum hibernansR.E.Regel nom. inval.
    • Hordeum himalayenseSchult.
    • Hordeum hirtiusculumR.E.Regel nom. inval.
    • Hordeum horsfordianumR.E.Regel nom. inval.
    • Hordeum ircutianumR.E.Regel nom. inval.
    • Hordeum jarenskianumR.E.Regel nom. inval.
    • Hordeum juliaeR.E.Regel nom. inval.
    • Hordeum kalugenseR.E.Regel nom. inval.
    • Hordeum karzinianumR.E.Regel nom. inval.
    • Hordeum kiarchanumR.E.Regel nom. inval.
    • Hordeum laevipaleatumR.E.Regel nom. inval.
    • Hordeum lapponicumR.E.Regel nom. inval.
    • Hordeum leptostachysGriff.
    • Hordeum macrolepisA.Braun
    • Hordeum mandshuricumR.E.Regel nom. inval.
    • Hordeum mandshuroidesR.E.Regel nom. inval.
    • Hordeum michalkowiiR.E.Regel nom. inval.
    • Hordeum nekludowiiR.E.Regel nom. inval.
    • Hordeum nigrumWilld.
    • Hordeum pamiricumVavilov nom. inval.
    • Hordeum parvumR.E.Regel nom. inval.
    • Hordeum pensanumR.E.Regel nom. inval.
    • Hordeum polystichonHaller
    • Hordeum praecoxR.E.Regel nom. inval.
    • Hordeum pyramidatumR.E.Regel nom. inval.
    • Hordeum revelatum(Körn.) A.Schulz
    • Hordeum sativumJess. nom. illeg.
    • Hordeum sativumPers. nom. inval.
    • Hordeum scabriusculumR.E.Regel nom. inval.
    • Hordeum septentrionaleR.E.Regel nom. inval.
    • Hordeum stassewitschiiR.E.Regel nom. inval.
    • Hordeum strobelenseChiov.
    • Hordeum taganrocenseR.E.Regel nom. inval.
    • Hordeum tanaiticumR.E.Regel nom. inval.
    • Hordeum tetrastichumStokes
    • Hordeum transcaucasicumR.E.Regel nom. inval.
    • Hordeum violaceumR.E.Regel nom. inval.
    • Hordeum walpersiiR.E.Regel nom. inval.
    • Secale orientaleSchreb. ex Roth nom. inval.

Barley (Hordeum vulgare), a member of the grass family, is a major cereal grain grown in temperate climates globally. It was one of the first cultivated grains; it was domesticated in the Fertile Crescent around 9000 BC, giving it nonshattering spikelets and making it much easier to harvest. Its use then spread throughout Eurasia by 2000 BC. Barley prefers relatively low temperatures to grow, and well-drained soil. It is relatively tolerant of drought and soil salinity, but is less winter-hardy than wheat or rye.


In 2022, barley was fourth among grains in quantity produced, 155 million tonnes, behind maize, wheat, and rice. Globally 70% of barley production is used as animal feed, while 30% is used as a source of fermentable material for beer, or further distilled into whisky, and as a component of various foods. It is used in soups and stews, and in barley bread of various cultures. Barley grains are commonly made into malt in a traditional and ancient method of preparation. In English folklore, John Barleycorn personifies the grain, and the alcoholic beverages made from it. English pub names such as The Barley Mow allude to barley's role in the production of beer.


The Barley Barn at Cressing, Essex, built around 1220; its name means "barley-store". Barley Barn (cropped).jpg
The Barley Barn at Cressing, Essex, built around 1220; its name means "barley-store".

The Old English word for barley was bere. [4] This survives in the north of Scotland as bere ; it is used for a strain of six-row barley grown there. [5] Modern English barley derives from the Old English adjective bærlic, meaning "of barley". [3] [6] The word barn derives from Old English bere-aern meaning "barley-store". [3] The name of the genus is from Latin hordeum, barley, likely related to Latin horrere, to bristle. [7]


Botanical illustration of leafy stem with roots, flowers, and 2- and 6-row ears Illustration Hordeum vulgare1.jpg
Botanical illustration of leafy stem with roots, flowers, and 2- and 6-row ears

Barley is a cereal, a member of the grass family with edible grains. Its flowers are clusters of spikelets arranged in a distinctive herringbone pattern. Each spikelet has a long thin awn (to 160 mm (6.3 in) long), making the ears look tufted. The spikelets are in clusters of three. In six-row barley, all three spikelets in each cluster are fertile; in two-row barley, only the central one is fertile. [8] It is a self-pollinating, diploid species with 14 chromosomes. [9]

The genome of barley was sequenced in 2012 by the International Barley Genome Sequencing Consortium and the UK Barley Sequencing Consortium. [10] The genome is organised into seven pairs [11] of nuclear chromosomes (recommended designations: 1H, 2H, 3H, 4H, 5H, 6H and 7H), and one mitochondrial and one chloroplast chromosome, with a total of 5000 Mbp. [12] Details of the genome are freely available in several barley databases. [13]


External phylogeny

The barley genus Hordeum is relatively closely related to wheat and rye within the Triticeae, and more distantly to rice within the BOP clade of grasses (Poaceae). [14] The phylogeny of the Triticeae is complicated by horizontal gene transfer between species, so there is a network of relationships rather than a simple inheritance-based tree. [15]

(Part of  Poaceae)
BOP clade

Bambusoideae (bamboos)

other grasses

 (fescue, ryegrass)


Hordeum (barley)

Triticum (wheat)

Secale (rye)

Oryza (rice)

PACMAD clade

other grasses

Sorghum (sorghum)

Zea (maize)


Genetic analysis on the spread of barley from 9,000 to 2,000 BCE Genetic analysis on the spread of barley from 9000 to 2000 BCE.jpg
Genetic analysis on the spread of barley from 9,000 to 2,000 BCE

Barley was one of the first grains to be domesticated in the Fertile Crescent, an area of relatively abundant water in Western Asia, [17] around 9,000 BC. [16] [18] Wild barley (H. vulgare ssp. spontaneum) ranges from North Africa and Crete in the west to Tibet in the east. [9] A study of genome-wide diversity markers found Tibet to be an additional center of domestication of cultivated barley. [19] The earliest archaeological evidence of the consumption of wild barley, Hordeum spontaneum, comes from the Epipaleolithic at Ohalo II at the southern end of the Sea of Galilee, where grinding stones with traces of starch were found. The remains were dated to about 23,000 BC. [9] [20] [21] The earliest evidence for the domestication of barley, in the form of cultivars that cannot reproduce without human assistance, comes from Mesopotamia, specifically the Jarmo region of modern-day Iraq, around 9,000-7,000 BC. [22] [23]

Domestication changed the morphology of the barley grain substantially, from an elongated shape to a more rounded spherical one. [24] Wild barley has distinctive genes, alleles, and regulators with potential for resistance to abiotic or biotic stresses; these may help cultivated barley to adapt to climatic changes. [25] Wild barley has a brittle spike; upon maturity, the spikelets separate, facilitating seed dispersal. Domesticated barley has nonshattering spikelets, making it much easier to harvest the mature ears. [9] The nonshattering condition is caused by a mutation in one of two tightly linked genes known as Bt1 and Bt2; many cultivars possess both mutations. The nonshattering condition is recessive, so varieties of barley that exhibit this condition are homozygous for the mutant allele. [9] Domestication in barley is followed by the change of key phenotypic traits at the genetic level. [26]

The wild barley found currently in the Fertile Crescent may not be the progenitor of the barley cultivated in Eritrea and Ethiopia, indicating that it may have been domesticated separately in eastern Africa. [27]


An account of barley rations issued monthly to adults (30 or 40 pints) and children (20 pints) written in cuneiform on clay tablet in year 4 of King Urukagina (circa 2350 BCE), from Girsu, Iraq Issue of barley rations.JPG
An account of barley rations issued monthly to adults (30 or 40 pints) and children (20 pints) written in cuneiform on clay tablet in year 4 of King Urukagina (circa 2350 BCE), from Girsu, Iraq

Archaeobotanical evidence shows that barley had spread throughout Eurasia by 2,000 BC. [16] Genetic analysis demonstrates that cultivated barley followed several different routes over time. [16] By 4200 BC domesticated barley had reached Eastern Finland. [28] Barley has been grown in the Korean Peninsula since the Early Mumun Pottery Period (circa 1500–850 BC). [29] Barley (Yava in Sanskrit) is mentioned many times in the Rigveda and other Indian scriptures as a principal grain in ancient India. [30] Traces of barley cultivation have been found in post-Neolithic Bronze Age Harappan civilization 5,700–3,300 years ago. [31] Barley beer was probably one of the first alcoholic drinks developed by Neolithic humans; [32] later it was used as currency. [32] The Sumerian language had a word for barley, akiti. In ancient Mesopotamia, a stalk of barley was the primary symbol of the goddess Shala. [33]

Barley in Egyptian hieroglyphs
jt barley determinative/ideogram
jt (common) spelling
šma determinative/ideogram

Rations of barley for workers appear in Linear B tablets in Mycenaean contexts at Knossos and at Mycenaean Pylos. [34] In mainland Greece, the ritual significance of barley possibly dates back to the earliest stages of the Eleusinian Mysteries. The preparatory kykeon or mixed drink of the initiates, prepared from barley and herbs, mentioned in the Homeric hymn to Demeter. The goddess's name may have meant "barley-mother", incorporating the ancient Cretan word δηαί (dēai), "barley". [35] [36] The practice was to dry the barley groats and roast them before preparing the porridge, according to Pliny the Elder's Natural History . [37] Tibetan barley has been a staple food in Tibetan cuisine since the fifth century AD. This grain, along with a cool climate that permitted storage, produced a civilization that was able to raise great armies. [38] It is made into a flour product called tsampa that is still a staple in Tibet. [39] In medieval Europe, bread made from barley and rye was peasant food, while wheat products were consumed by the upper classes. [40]

Taxonomy and varieties

Two-row and six-row barley

Spikelets are arranged in triplets which alternate along the rachis. In wild barley (and other Old World species of Hordeum), only the central spikelet is fertile, while the other two are reduced. This condition is retained in certain cultivars known as two-row barleys. A pair of mutations (one dominant, the other recessive) result in fertile lateral spikelets to produce six-row barleys. [9] A mutation in one gene, vrs1, is responsible for the transition from two-row to six-row barley. [41]

In traditional taxonomy, different forms of barley were classified as different species based on morphological differences. Two-row barley with shattering spikes (wild barley) was named Hordeum spontaneum (K. Koch). Two-row barley with nonshattering spikes was named as H. distichon (L.), six-row barley with nonshattering spikes as H. vulgare L. (or H. hexastichum L.), and six-row with shattering spikes as H. agriocrithon Åberg. Because these differences were driven by single-gene mutations, coupled with cytological and molecular evidence, most recent classifications treat these forms as a single species, H. vulgare L. [9]

Hulless barley

Hulless or "naked" barley (Hordeum vulgare L. var. nudum Hook. f.) is a form of domesticated barley with an easier-to-remove hull. Naked barley is an ancient food crop, but a new industry has developed around uses of selected hulless barley to increase the digestibility of the grain, especially for pigs and poultry. [42] Hulless barley has been investigated for several potential new applications as whole grain, bran, and flour. [43]

Barley production – 2022
Country Millions of tonnes
Flag of Russia.svg  Russia 23.4
Flag of France.svg  France 11.3
Flag of Germany.svg  Germany 11.2
Flag of Canada (Pantone).svg  Canada 10.0
Flag of Turkey.svg  Turkey 8.5
Flag of Spain.svg  Spain 7.0
World154.9 [44]


In 2022, world production of barley was 155 million tonnes, led by Russia accounting for 15% of the world total (table). France, Germany, and Canada were secondary producers. Worldwide barley production was fourth among grains, following maize (1.2 billion tonnes), wheat (808 million tonnes), and rice (776 million tonnes). [45]


Barley is a crop that prefers relatively low temperatures, 15 to 20 °C in the growing season; it is grown around the world in temperate areas. It grows best in well-drained soil in full sunshine. In the tropics and subtropics, it is grown for food and straw in South Asia, North and East Africa, and in the Andes of South America. In dry regions it requires irrigation. [46] It has a short growing season and is relatively drought-tolerant. [40] Barley is more tolerant of soil salinity than other cereals, varying in different cultivars. [47] It has less winter-hardiness than winter wheat and far less than rye. [48]

Like other cereals, barley is typically planted on tilled land. Seed was traditionally scattered, but in developed countries is usually drilled. As it grows it requires soil nutrients (nitrogen, phosphorus, potassium), often supplied as fertilizers. It needs to be monitored for pests and diseases, and if necessary treated before these become serious. The stems and ears turn yellow when ripe, and the ears begin to droop. Traditional harvesting was by hand with sickles or scythes; in developed countries, harvesting is mechanised with combine harvesters. [46]

Pests and diseases

Among the insect pests of barley are aphids such as Russian wheat aphid, caterpillars such as of the armyworm moth, barley mealybug, and wireworm larvae of click beetle genera such as Aeolus . Aphid damage can often be tolerated, whereas armyworms can eat whole leaves. Wireworms kill seedlings, and require seed or preplanting treatment. [46]

Serious fungal diseases of barley include powdery mildew caused by Blumeria graminis , leaf scald caused by Rhynchosporium secalis , barley rust caused by Puccinia hordei , crown rust caused by Puccinia coronata , various diseases caused by Cochliobolus sativus , Fusarium ear blight, [49] and stem rust (Puccinia graminis). [50] Bacterial diseases of barley include bacterial blight caused by Xanthomonas campestris pv. translucens. [51] Barley is susceptible to several viral diseases, such as barley mild mosaic bymovirus. [52] [53] Some viruses, such as barley yellow dwarf virus, vectored by the rice root aphid, can cause serious crop injury. [54]

For durable disease resistance, quantitative resistance is more important than qualitative resistance. The most important foliar diseases have corresponding resistance gene regions on all chromosomes of barley. [11] A large number of molecular markers are available for breeding of resistance to leaf rust, powdery mildew, Rhynchosporium secalis , Pyrenophora teres f. teres, Barley yellow dwarf virus , and the Barley yellow mosaic virus complex. [55] [56]


Cooked barley
Barley grains 3.jpg
Nutritional value per 100 g (3.5 oz)
Energy 515 kJ (123 kcal)
28.2 g
Sugars 0.3 g
Dietary fiber 3.8 g
0.4 g
2.3 g
Vitamins Quantity
Vitamin A equiv.
0 μg
5 μg
56 μg
Thiamine (B1)
0.083 mg
Riboflavin (B2)
0.062 mg
Niacin (B3)
2.063 mg
Pantothenic acid (B5)
0.135 mg
Vitamin B6
0.115 mg
Folate (B9)
16 μg
Vitamin B12
0 μg
13.4 mg
Vitamin C
0 mg
Vitamin D
0 IU
Vitamin E
0.01 mg
Vitamin K
0.8 μg
Minerals Quantity
11 mg
0.105 mg
1.3 mg
22 mg
0.259 mg
54 mg
93 mg
3 mg
0.82 mg
Other constituentsQuantity
Water68.8 g
Cholesterol 0 mg

Percentages are roughly approximated using US recommendations for adults.


Hulled barley (or covered barley) is eaten after removing the inedible, fibrous, outer husk or hull. Once removed, it is called dehulled barley (or pot barley or scotch barley). [57] Pearl barley (or pearled barley) is dehulled to remove most of the bran, and polished. [57] Barley meal, a wholemeal barley flour lighter than wheat meal but darker in colour, is used in gruel. [57] This gruel is known as سويق : sawīq in the Arab world. [58]

With a long history of cultivation in the Middle East, barley is used in a wide range of traditional Arabic, Assyrian, Israelite, Kurdish, and Persian foodstuffs including Keşkek, kashk, and murri. Barley soup is traditionally eaten during Ramadan in Saudi Arabia. [59] Cholent or hamin (in Hebrew) is a traditional Jewish stew often eaten on Sabbath, in numerous recipes by both Mizrachi and Ashkenazi Jews; its original form was a barley porridge. [60]

In Eastern and Central Europe, barley is used in soups and stews such as ričet. In Africa, where it is a traditional food plant, it has the potential to improve nutrition, boost food security, foster rural development, and support sustainable landcare. [61]

The six-row variety bere is cultivated in Orkney, Shetland, Caithness and the Western Isles of the Scottish Highlands and Islands. When milled into beremeal, it is used locally in bread, biscuits, and the traditional beremeal bannock. [62]

In Japanese cuisine, barley is mixed with rice and steamed as mugimeshi. [63] The naval surgeon Takaki Kanehiro introduced it into institutional cooking to combat beriberi, endemic in the armed forces in the 19th century. It became standard prison fare, and remains a staple in the Japan Self-Defense Forces. [64]


Cooked barley is 69% water, 28% carbohydrates, 2% protein, and 0.4% fat (table). In a 100-gram (3.5 oz) reference serving, cooked barley provides 515 kilojoules (123 kcal) of food energy and is a good source (10% or more of the Daily Value, DV) of essential nutrients, including, dietary fibre, the B vitamin niacin (14% DV), and dietary minerals, including iron (10% DV) and manganese (12% DV) (table). [65]

Health implications

According to Health Canada and the US Food and Drug Administration, consuming at least 3 grams per day of barley beta-glucan can lower levels of blood cholesterol, a risk factor for cardiovascular diseases. [66] [67] Eating whole-grain barley, a high-fibre grain, improves regulation of blood sugar (i.e., reduces blood glucose response to a meal). [68] Consuming breakfast cereals containing barley over weeks to months improves cholesterol levels and glucose regulation. [69] Barley contains gluten, which makes it an unsuitable grain for consumption by people with gluten-related disorders, such as coeliac disease, non-coeliac gluten sensitivity and wheat allergy sufferers. [70] Nevertheless, some wheat allergy patients can tolerate barley. [71]


Beer, whisky, and soft drinks

Barley, made into malt, is a key ingredient in beer and whisky production. [72] Two-row barley is traditionally used in German and English beers. Six-row barley was traditionally used in US beers, but both varieties are in common usage now. [73] Distilled from green beer, [74] Scottish and Irish whisky are made primarily from barley. [72] About 25% of American barley is used for malting, for which barley is the best-suited grain. [75] Accordingly, barley is often assessed by its malting enzyme content. [11] Barley wine is a style of strong beer from the English brewing tradition. An 18th-century alcoholic drink of the same name was made by boiling barley in water, then mixing the barley water with white wine, borage, lemon and sugar. In the 19th century, a different barley wine was prepared from recipes of ancient Greek origin. [3]

Nonalcoholic drinks such as barley water [3] and roasted barley tea have been made by boiling barley in water. [76] In Italy, roasted barley is sometimes used as coffee substitute, caffè d'orzo (barley coffee). [77]

Animal feed

Barley-based animal feed pellets LPCC-467-Pinso amb farina d'ordi, granulat.jpg
Barley-based animal feed pellets

Some 70% of the world's barley production is used as livestock feed, [78] for example for cattle feeding in western Canada. [79] In 2014, an enzymatic process was devised to make a high-protein fish feed from barley, suitable for carnivorous fish such as trout and salmon. [80]

Other uses

Barley straw has been placed in mesh bags and floated in fish ponds or water gardens to help prevent algal growth without harming pond plants and animals. The technique's effectiveness is at best mixed. [81] Barley grains were once used for measurement in England, there being nominally three or four barleycorns to the inch. [82] By the 19th century, this had been superseded by standard inch measures. [83] In ancient Mesopotamia, barley was used as a form of money, the standard unit of weight for barley, and hence of value, being the shekel. [84]

Culture and folklore

In English folklore, the figure of John Barleycorn in the folksong of the same name is a personification of barley, and of the alcoholic beverages made from it: beer and whisky. In the song, John Barleycorn is represented as suffering attacks, death, and indignities that correspond to the various stages of barley cultivation, such as reaping and malting; but he is revenged by getting the men drunk: "And little Sir John and the nut-brown bowl / Proved the strongest man at last." [85] [86] The folksong "Elsie Marley" celebrates an alewife of County Durham with lines such as "And do you ken Elsie Marley, honey? / The wife that sells the barley, honey". The antiquary Cuthbert Sharp records that Elsie Marley was "a handsome, buxom, bustling landlady, and brought good custom to the [ale] house by her civility and attention." [87]

English pub names such as The Barley Mow, [88] John Barleycorn, [85] Malt Shovel, [89] and Mash Tun [90] allude to barley's role in the production of beer. [88]

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<span class="mw-page-title-main">Oat</span> Cool weather staple grain, animal feed

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Commercial sorghum is the cultivation and commercial exploitation of species of grasses within the genus Sorghum. These plants are used for grain, fibre and fodder. The plants are cultivated in warmer climates worldwide. Commercial Sorghum species are native to tropical and subtropical regions of Africa and Asia.

<i>Hordeum pusillum</i> Species of grass

Hordeum pusillum, also known as little barley, is an annual grass native to most of the United States and southwestern Canada. It arrived via multiple long-distance dispersals of a southern South American species of Hordeum about one million years ago. Its closest relatives are therefore not the other North American taxa like meadow barley or foxtail barley, but rather Hordeum species of the Pampas of central Argentina and Uruguay. It is less closely related to the Old World domesticated barley, from which it diverged about 12 million years ago. It is diploid.

<i>Thinopyrum intermedium</i> Species of flowering plant

Thinopyrum intermedium, known commonly as intermediate wheatgrass, is a sod-forming perennial grass in the Triticeae tribe of Pooideae native to Europe and Western Asia. It is part of a group of plants commonly called wheatgrasses because of the similarity of their seed heads or ears to common wheat. However, wheatgrasses generally are perennial, while wheat is an annual. It has gained the Royal Horticultural Society's Award of Garden Merit as an ornamental.

<span class="mw-page-title-main">Bere (grain)</span> Scottish type of barley

Bere, pronounced "bear," is a six-row barley currently cultivated mainly on 5-15 hectares of land in Orkney, Scotland. It is also grown in Shetland, Caithness and on a very small scale by a few crofters on some of the Western Isles, i.e. North Uist, Benbecula, South Uist, Islay and Barra. It is probably Britain's oldest cereal in continuous commercial cultivation.

<i>Hordeum spontaneum</i> Species of grass

Hordeum spontaneum, commonly known as wild barley or spontaneous barley, is the wild form of the grass in the family Poaceae that gave rise to the cereal barley. Domestication is thought to have occurred on two occasions, first about ten thousand years ago in the Fertile Crescent and again later, several thousand kilometres further east.

<span class="mw-page-title-main">Ancient grains</span> Small, hard, dry seeds used as food

Ancient grains is a marketing term used to describe a category of grains and pseudocereals that are purported to have been minimally changed by selective breeding over recent millennia, as opposed to more widespread cereals such as corn, rice and modern varieties of wheat, which are the product of thousands of years of selective breeding. Ancient grains are often marketed as being more nutritious than modern grains, though their health benefits over modern varieties have been disputed by some nutritionists.

Golden Promise is a variety of spring-sown two-row barley. It was developed in the 1950s by exposing an existing variety to gamma radiation with the aim of producing a semi-dwarf variety of barley that had good malting characteristics. It became very popular with farmers during the 1970s but began to be replaced by higher yielding varieties in the 1980s. Due to its perceived better flavour than these more modern varieties, a niche market was maintained and it is still favoured by craft brewers. It has been used by researchers to study the genetics of barley and to investigate the effect of barley on the flavour of beer.


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