orchardgrass USDA PLANTS Symbol: DAGL
U.S. Nativity: Exotic
Habit: Grass or Grasslike
Dactylis glomerata L.

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Taxonomic Rank: Liliopsida: Cyperales: Poaceae
Synonym(s): cocksfoot, orchard grass
Native Range: Eurasia (BAIL);

Dactylis glomerata is a cool-season perennial that grows 1.4-4 ft. (0.43-1.2 m) tall. Under dry conditions it usually develops in clumps.
Leaves have a bluish hue and grow up to 0.5 in. (1.3 cm) wide, folded when immature but later flat, with prominent white midrib on the under side.
The flowers are yellow and occur in a panicle with spikelets in a compact cluster on one side of the rachilla. Flowers bloom from May to August.
Panicle, 2-8 in. (5.1-20.3 cm) long, with spikelets grouped together in dense, one-sided clusters at the end of panicle branches; spikelets contain 2 to 5 florets; lemmas pointed to short-awned.
Ecological Threat
Dactylis glomerata is native to Europe and was first introduced to the United States in the late 1700s. It prefers areas that are well-drained with moderately fertile to rich soils.

Selected Images from Invasive.orgView All Images at Invasive.org

Stand; extreme grass competition in an old harvest unit at Glenn Ridge, Walla Walla District
Dave Powell, USDA Forest Service (retired), Bugwood.org
Additional Resolutions & Image Usage

Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage

Catherine Herms, The Ohio State University, Bugwood.org
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Lynn Sosnoskie, University of Georgia, Bugwood.org
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Flower(s); inflorescence.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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EDDMapS Distribution:
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org

State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.

U.S. National Parks where reported invasive:
Antietam National Battlefield (Maryland)
Appomattox Court House National Historical Park (Virginia)
Badlands National Park (South Dakota)
Colonial National Historical Park (Virginia)
Fredericksburg & Spotsylvania National Military Park (Virginia)
George Washington Birthplace National Monument (Virginia)
Haleakala National Park (Hawaii)
Petersburg National Battlefield (Virginia)
Rocky Mountains National Park (Colorado)
Thomas Stone National Historic Site (Maryland)

Invasive Listing Sources:
California Invasive Plant Council
City of Ann Arbor Michigan Parks and Recreation
Faith Campbell, 1998
Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
John Randall, The Nature Conservancy, Survey of TNC Preserves, 1995.
Mid-Atlantic Exotic Pest Plant Council, 2005
Native Plant Society of Oregon, 2008
Pacific Northwest Exotic Pest Plant Council, 1998
University of Hawaii, Botany Department, Hawaiian Alien Plant Studies, 1998