''Poa pratensis'', commonly known as Kentucky bluegrass (or blue grass), smooth meadow-grass, or common meadow-grass, is a

perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also widel ...

species of

grass Poaceae () or Gramineae () is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns a ...

native to practically all of Europe,

North Asia North Asia or Northern Asia, also referred to as Siberia, is the northern region of Asia, which is defined in geographical terms and is coextensive with the Asian part of Russia, and consists of three Russian regions east of the Ural Mountains ...

and the mountains of Algeria and Morocco. Although the species is spread over all of the cool, humid parts of the United States, it is not native to

North America North America is a continent in the Northern Hemisphere and almost entirely within the Western Hemisphere. It is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South America and th ...

. The

Spanish Empire The Spanish Empire ( es, link=no, Imperio español), also known as the Hispanic Monarchy ( es, link=no, Monarquía Hispánica) or the Catholic Monarchy ( es, link=no, Monarquía Católica) was a colonial empire governed by Spain and its prede ...

brought the seeds of Kentucky bluegrass to the

New World The term ''New World'' is often used to mean the majority of Earth's Western Hemisphere, specifically the Americas."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: Oxford University Press, p. ...

in mixtures with other grasses. In its native range, ''Poa pratensis'' forms a valuable pasture plant, characteristic of well-drained, fertile soil. It is also used for making

lawn A lawn is an area of soil-covered land planted with grasses and other durable plants such as clover which are maintained at a short height with a lawnmower (or sometimes grazing animals) and used for aesthetic and recreational purposes. ...

s in parks and gardens and has established itself as a common invasive weed across cool moist climates like the

Pacific Northwest The Pacific Northwest (sometimes Cascadia, or simply abbreviated as PNW) is a geographic region in western North America bounded by its coastal waters of the Pacific Ocean to the west and, loosely, by the Rocky Mountains to the east. Thou ...

and the

Northeastern United States The Northeastern United States, also referred to as the Northeast, the East Coast, or the American Northeast, is a geographic region of the United States. It is located on the Atlantic coast of North America, with Canada to its north, the Southe ...

. When found on native grasslands in Canada, for example, it is considered an unwelcome exotic plant, and is indicative of a disturbed and degraded landscape.

Taxonomy

''Poa pratensis'' was one of the many species described by

Carl Linnaeus Carl Linnaeus (; 23 May 1707 – 10 January 1778), also known after his ennoblement in 1761 as Carl von Linné Blunt (2004), p. 171. (), was a Swedish botanist, zoologist, taxonomist, and physician who formalised binomial nomenclature, ...

in his landmark work ''

Species Plantarum ' (Latin for "The Species of Plants") is a book by Carl Linnaeus, originally published in 1753, which lists every species of plant known at the time, classified into genera. It is the first work to consistently apply binomial names and was the ...

'' in 1753. is

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

for

fodder Fodder (), also called provender (), is any agricultural foodstuff used specifically to feed domesticated livestock, such as cattle, rabbits, sheep, horses, chickens and pigs. "Fodder" refers particularly to food given to the animals (includ ...

and ''pratensis'' is derived from , the

Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through ...

for

meadow A meadow ( ) is an open habitat, or field, vegetated by grasses, herbs, and other non- woody plants. Trees or shrubs may sparsely populate meadows, as long as these areas maintain an open character. Meadows may be naturally occurring or arti ...

. The name Kentucky bluegrass derives from its flower heads, which are blue when the plant is allowed to grow to its natural height of . ''Poa pratensis'' is the

type species In zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the species that contains the biological type specim ...

of the grass family

Poaceae Poaceae () or Gramineae () is a large and nearly ubiquitous family of monocotyledonous flowering plants commonly known as grasses. It includes the cereal grasses, bamboos and the grasses of natural grassland and species cultivated in lawns an ...

. There are two ill-defined subspecies: *''Poa pratensis'' subsp. ''pratensis'' – temperate regions *''Poa pratensis'' subsp. ''colpodea'' – Arctic

Description

''Poa pratensis'' is a

herbaceous Herbaceous plants are vascular plants that have no persistent woody stems above ground. This broad category of plants includes many perennials, and nearly all annuals and biennials. Definitions of "herb" and "herbaceous" The fourth edition o ...

perennial plant tall. The

leaves A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...

have boat-shaped tips, narrowly linear, up to long and broad, smooth or slightly roughened, with a rounded to truncate ligule long. The conical

panicle A panicle is a much-branched inflorescence. (softcover ). Some authors distinguish it from a compound spike inflorescence, by requiring that the flowers (and fruit) be pedicellate (having a single stem per flower). The branches of a panicle are of ...

is long, with 3 to 5 branches in the basal whorls; the oval

spikelet A spikelet, in botany, describes the typical arrangement of the flowers of grasses, sedges and some other Monocots. Each spikelet has one or more florets. The spikelets are further grouped into panicles or spikes. The part of the spikelet that ...

s are long with 2 to 5

floret This glossary of botanical terms is a list of definitions of terms and concepts relevant to botany and plants in general. Terms of plant morphology are included here as well as at the more specific Glossary of plant morphology and Glossary o ...

s, and are purplish-green or grey. They are in flower from May to July, compared to annual meadowgrass ('' Poa annua'') which is in flower for eight months of the year. ''Poa pratensis'' has a fairly prominent mid-vein (center of the blade). The

ligule A ligule (from "strap", variant of ''lingula'', from ''lingua'' "tongue") is a thin outgrowth at the junction of leaf and leafstalk of many grasses (Poaceae) and sedges. A ligule is also a strap-shaped extension of the corolla, such as that of a ...

is extremely short and square-ended, making a contrast with annual meadowgrass ('' Poa annua'') and rough meadowgrass ('' Poa trivialis'') in which it is silvery and pointed. The Kentucky bluegrass is a dark green/blue compared to the apple-green color of ''Poa annua'' and ''Poa trivialis''. The

rootstock A rootstock is part of a plant, often an underground part, from which new above-ground growth can be produced. It could also be described as a stem with a well developed root system, to which a bud from another plant is grafted. It can refer to a ...

is creeping, with runners (

rhizome In botany and dendrology, a rhizome (; , ) is a modified subterranean plant stem that sends out roots and shoots from its nodes. Rhizomes are also called creeping rootstalks or just rootstalks. Rhizomes develop from axillary buds and grow ...

s). The broad, blunt leaves tend to spread at the base, forming close mats.

Ecology

PP Na Popovickem kopci 007 cf Myrmus miriformis

''Poa pratensis'' is among the food plants of the caterpillars of the

meadow brown The meadow brown (''Maniola jurtina'') is a butterfly found in the Palearctic realm. Its range includes Europe south of 62°N, Russia eastwards to the Urals, Asia Minor, Iraq, Iran, North Africa and the Canary Islands. The larvae feed on grasse ...

(''Maniola jurtina''),

gatekeeper A gatekeeper is a person who controls access to something, for example via a city gate or bouncer, or more abstractly, controls who is granted access to a category or status. Gatekeepers assess who is "in or out", in the classic words of manage ...

(''Pyronia tithonus''), and

pepper-and-salt skipper ''Amblyscirtes hegon'', the pepper-and-salt skipper, is a butterfly of the family Hesperiidae. It is found from Nova Scotia and Maine, west to southern Manitoba, south to Georgia, northern Florida and south-eastern Texas. It is mostly absent fro ...

butterflies; the common sun beetle ('' Amara aenea'') (adults feed on the developing seeds), ''Eupelix cuspidata'' of the

leafhopper A leafhopper is the common name for any species from the family Cicadellidae. These minute insects, colloquially known as hoppers, are plant feeders that suck plant sap from grass, shrubs, or trees. Their hind legs are modified for jumping, and ...

family, and ''

Myrmus miriformis ''Strongylognathus'' is a genus of ants in the subfamily Myrmicinae. Many of its species are endemic to specific regions. Species *''Strongylognathus afer'' Emery, 1884 *''Strongylognathus alboini'' Finzi, 1924 *''Strongylognathus alpinus'' Wh ...

'', a grassbug (feeds on young blades and developing seeds). ''Poa pratensis'' is host to a number of

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately fr ...

, including '' Claviceps purpurea'', which causes

ergotism Ergotism (pron. ) is the effect of long-term ergot poisoning, traditionally due to the ingestion of the alkaloids produced by the '' Claviceps purpurea'' fungus—from the Latin "club" or clavus "nail" and for "head", i.e. the purple club-he ...

when consumed, '' Drechslera poae'', '' Epichloë typhina'', '' Phaeoseptoria poae'', '' Puccinia brachypodii'' var. ''poae-nemoralis'', '' Stagonospora montagnei'', '' Stagonospora nodorum'' and '' Wojnowicia hirta''.Helgi Hallgrímsson & Guðríður Gyða Eyjólfsdóttir (2004)
''Íslenskt sveppatal I - smásveppir'' [Checklist of Icelandic Fungi I - Microfungi
Fjölrit Náttúrufræðistofnunar. Náttúrufræðistofnun Íslands [Icelandic Institute of Natural History]. ISSN 1027-832X

Cultivation and production

Since the 1950s and early 1960s, 90% of Kentucky bluegrass seed in the United States has been produced on specialist farms in Idaho,

Oregon Oregon () is a U.S. state, state in the Pacific Northwest region of the Western United States. The Columbia River delineates much of Oregon's northern boundary with Washington (state), Washington, while the Snake River delineates much of it ...

and

Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...

. During the 1990s botanists began experimenting with hybrids of ''Poa pratensis'' and Texas bluegrass ('' P. arachnifera''), with the goal of creating a

drought A drought is defined as drier than normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, an ...

and heat-resistant lawn grass. In warm climates, hybrids may remain green year-round.

NFL playing surfaces

Lambeau Field Lambeau Field is an outdoor athletic stadium in the north central United States, located in Green Bay, Wisconsin. The home field of the Green Bay Packers of the National Football League (NFL), it opened in 1957 as City Stadium, replacing ...

Green Bay, WI Green Bay is a city in the U.S. state of Wisconsin. The county seat of Brown County, it is at the head of Green Bay (known locally as "the bay of Green Bay"), a sub-basin of Lake Michigan, at the mouth of the Fox River. It is above sea lev ...

* FirstEnergy Stadium in

Cleveland, Ohio Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U.S ...

Empower Field at Mile High Empower Field at Mile High (previously known as Broncos Stadium at Mile High, Invesco Field at Mile High and Sports Authority Field at Mile High, and commonly known as Mile High, New Mile High or Mile High Stadium) is an American football stadiu ...

Denver, Colorado Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...

Acrisure Stadium Acrisure Stadium is a football stadium located in the North Shore neighborhood of Pittsburgh, Pennsylvania, United States. It primarily serves as the home of the Pittsburgh Steelers of the National Football League (NFL) and the Pittsburgh Pa ...

Pittsburgh, Pennsylvania Pittsburgh ( ) is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Allegheny County, Pennsylvania, Allegheny County. It is the most populous city in both Allegheny County and Wester ...

MLB playing surfaces

Oriole Park at Camden Yards The Oriole Park at Camden Yards is a baseball stadium located in Baltimore, Maryland. It is the home field of Major League Baseball's Baltimore Orioles, and the first of the "retro" major league ballparks constructed during the 1990s and early ...

Baltimore, MD Baltimore ( , locally: or ) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore wa ...

Eckert, Nora and Kostka, Andy. "Orioles, Ravens groundskeepers challenged by climate change," Capital News Service, Tuesday, October 29, 2019.
Retrieved March 28, 2022. *

Fenway Park Fenway Park is a baseball stadium located in Boston, Massachusetts, United States, near Kenmore Square. Since 1912, it has been the home of the Boston Red Sox, the city's American League baseball team, and Boston Braves (baseball), since 1953, i ...

Boston, MA Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the cultural and financial center of the New England region of the United States. It is the 24th- most ...

* American Family Field in

Milwaukee, WI Milwaukee ( ), officially the City of Milwaukee, is both the most populous and most densely populated city in the U.S. state of Wisconsin and the county seat of Milwaukee County. With a population of 577,222 at the 2020 census, Milwaukee is ...

Yankee Stadium Yankee Stadium is a baseball stadium located in the Bronx, New York City. It is the home field of the New York Yankees of Major League Baseball, and New York City FC of Major League Soccer. Opened in April 2009, the stadium replaced the orig ...

in Bronx, NY *

Citi Field Citi Field is a baseball stadium located in Flushing Meadows–Corona Park in New York City, United States. It opened in 2009 and is the home field of Major League Baseball's New York Mets. The stadium was built as a replacement for the adjacent ...

in Queens, NY * Busch Stadium in St.Louis, MO * Nationals Park in

Washington, DC ) , image_skyline = , image_caption = Clockwise from top left: the Washington Monument and Lincoln Memorial on the National Mall, United States Capitol, Logan Circle, Jefferson Memorial, White House, Adams Morg ...

PNC Park PNC Park is a baseball stadium on the North Shore of Pittsburgh, Pennsylvania. It is the fifth home of the Pittsburgh Pirates of Major League Baseball (MLB). It was opened during the 2001 MLB season, after the controlled implosion of the Pira ...

in Pittsburgh, PA *

Wrigley Field Wrigley Field is a Major League Baseball (MLB) stadium on the North Side of Chicago, Illinois. It is the home of the Chicago Cubs, one of the city's two MLB franchises. It first opened in 1914 as Weeghman Park for Charles Weeghman's Chicago ...

Chicago, IL (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = List of sovereign states, Count ...

Guaranteed Rate Field Guaranteed Rate Field is a baseball stadium located on the South Side of Chicago, Illinois, United States. It serves as the home stadium of the Chicago White Sox, one of the city's two Major League Baseball (MLB) teams, and is owned by the state ...

Chicago, IL (''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = List of sovereign states, Count ...

Citizens Bank Park Citizens Bank Park is a baseball stadium located in Philadelphia, Pennsylvania, in the city's South Philadelphia Sports Complex. It is the home playing field of the Philadelphia Phillies, the city's Major League Baseball (MLB) franchise. The ...

Philadelphia, PA Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since ...

Comerica Park Comerica Park is a baseball stadium located in Downtown Detroit. It has been the home of Major League Baseball's Detroit Tigers since 2000, when the team left Tiger Stadium. History Construction Founded in 1894, the Tigers had played at the c ...

Detroit, MI Detroit ( , ; , ) is the largest city in the U.S. state of Michigan. It is also the largest U.S. city on the United States–Canada border, and the seat of government of Wayne County. The City of Detroit had a population of 639,111 at t ...

Progressive Field {{Infobox stadium , name = Progressive Field , nickname = ''"The Jake"'' , logo_image = Progressive_Field_Logo.svg , logo_caption = , image = , caption = Progressive Fiel ...

Cleveland, OH Cleveland ( ), officially the City of Cleveland, is a city in the U.S. state of Ohio and the county seat of Cuyahoga County. Located in the northeastern part of the state, it is situated along the southern shore of Lake Erie, across the U. ...

Target Field Target Field is a baseball stadium in the historic warehouse district of downtown Minneapolis. Since its opening in 2010, the stadium has been the home ballpark of Major League Baseball's Minnesota Twins. The stadium hosted the 2014 Major Leagu ...

Minneapolis, MN Minneapolis () is the largest city in Minnesota, United States, and the county seat of Hennepin County. The city is abundant in water, with list of lakes in Minneapolis, thirteen lakes, wetlands, the Mississippi River, creeks and waterfalls. ...

Kauffman Stadium Kauffman Stadium (), often called "The K", is a baseball stadium located in Kansas City, Missouri. It is home to the Kansas City Royals of Major League Baseball (MLB). It is part of the Truman Sports Complex together with the adjacent Arrowhead ...

Kansas City, MO Kansas City (abbreviated KC or KCMO) is the largest city in Missouri by population and area. As of the 2020 census, the city had a population of 508,090 in 2020, making it the 36th most-populous city in the United States. It is the central ...

(Kentucky Bluegrass/Perennial Ryegrass Blend) * Coors Field in

Denver, CO Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the United ...

(Kentucky Bluegrass/Perennial Ryegrass Blend) *

T-Mobile Park T-Mobile Park is a retractable roof stadium in Seattle, Washington, United States. It is the home ballpark of Major League Baseball's Seattle Mariners and has a seating capacity of 47,929. It is in Seattle's SoDo neighborhood, near the western t ...

Seattle, WA Seattle ( ) is a seaport city on the West Coast of the United States. It is the seat of King County, Washington. With a 2020 population of 737,015, it is the largest city in both the state of Washington and the Pacific Northwest region of ...

(Kentucky Bluegrass/Perennial Ryegrass Blend)

Gallery

File:Poa pratensis (Billeder af nordens flora 1917ff., v2 0383) clean, no-description.jpg File:Poa pratensis (3883809159).jpg File:Poa pratensis plant1 (7398746202).jpg File:Poa pratensis sl6.jpg File:Poa pratensis detail.jpeg, Closeup of flowers File:Poa pratensis sl19.jpg File:Poa pratensis sl12.jpg File:Poa pratensis seeds 20101113.jpg

References

External links

* {{Authority control Cosmopolitan species Grasses of Africa Grasses of Asia Grasses of Europe Grasses of North America Lawn grasses Plants described in 1753 pratensis Taxa named by Carl Linnaeus