Plantae > Tracheophyta > Liliopsida > Poales > Poaceae > Agrostis > Agrostis gigantea

Agrostis gigantea (redtop; black bent; water bentgrass)


Wikipedia Abstract

Agrostis gigantea, known by its common names black bent and redtop, is a perennial grass of the Agrostis genus. It is native to Europe, but in the cooler areas of North America was widely used as a pasture grass until the 1940s. Although it has largely been replaced by soybeans and more palatable grasses, it still gets some use in poor soils. It was one of the grasses planted in areas disturbed by the Trans-Alaska Pipeline. It generally does well in response to fires, due to survival of rhizomes and seeds.
View Wikipedia Record: Agrostis gigantea


Invasive Species

Agrostis gigantea commonly known as redtop, is reported to be weedy or invasive in some states in the USA and provinces in Canada. Native to temperate and tropical Asia, parts of Europe and North Africa, it was introduced for use as turf or lawn grass, as a fodder and forage species or for erosion control and revegetation purposes. Its impacts include displacement of native species in habitats where it is not managed properly.
View ISSG Record: Agrostis gigantea


Allergen Potential [1]  High
Screening - Summer [2]  Dense
Screening - Winter [2]  Porous
Bloom Period [2]  Mid Spring
Drought Tolerance [2]  Low
Fire Tolerance [2]  High
Frost Free Days [2]  90 days
Fruit/Seed Abundance [2]  High
Fruit/Seed Begin [2]  Summer
Fruit/Seed End [2]  Summer
Growth Form [2]  Rhizomatous
Growth Period [2]  Spring, Summer
Growth Rate [2]  Rapid
Leaf Type [2]  Deciduous
Lifespan [3]  Perennial
Propagation [2]  Seed
Regrowth Rate [2]  Moderate
Root Depth [2]  14 inches (36 cm)
Seed Spread Rate [2]  Slow
Seed Vigor [2]  High
Seeds Per [2]  4851190 / lb (10695053 / kg)
Shape/Orientation [2]  Decumbent
Structure [5]  Grass
Vegetative Spread Rate [2]  Rapid
Flower Color [2]  Yellow
Foliage Color [2]  Green
Fruit Color [2]  Brown
Height [3]  31 inches (.8 m)
Hardiness Zone Minimum [2]  USDA Zone: 3 Low Temperature: -40 F° (-40 C°) → -30 F° (-34.4 C°)
Light Preference [4]  Mostly Sunny
Soil Acidity [4]  Moderate Acid
Soil Fertility [4]  Rich
Soil Moisture [4]  Moist
Water Use [2]  Moderate

Protected Areas




Parasitized by 
Pyrenophora fugax[6]

Institutions (Zoos, etc.)

Institution Infraspecies / Breed 
Svalbard Global Seed Vault


North America; Temp. Eurasia;

External References

USDA Plant Profile



Attributes / relations provided by
1Derived from Allergy-Free Gardening OPALS™, Thomas Leo Ogren (2000)
2USDA Plants Database, U. S. Department of Agriculture
3PLANTATT - Attributes of British and Irish Plants: Status, Size, Life History, Geography and Habitats, M. O. Hill, C. D. Preston & D. B. Roy, Biological Records Centre, NERC Centre for Ecology and Hydrology (2004)
4ECOFACT 2a Technical Annex - Ellenberg’s indicator values for British Plants, M O Hill, J O Mountford, D B Roy & R G H Bunce (1999)
5Kattge, J. et al. (2011b) TRY - a global database of plant traits Global Change Biology 17:2905-2935
6Jorrit H. Poelen, James D. Simons and Chris J. Mungall. (2014). Global Biotic Interactions: An open infrastructure to share and analyze species-interaction datasets. Ecological Informatics.
7Ben-Dov, Y., Miller, D.R. & Gibson, G.A.P. ScaleNet 4 November 2009
Protected Areas provided by Biological Inventories of the World's Protected Areas in cooperation between the Information Center for the Environment at the University of California, Davis and numerous collaborators.
Calvin College Ecosystem Preserve
GBIF Global Biodiversity Information Facility
Edwin S. George Reserve, University of Michigan, Department of Ecology and Evolutionary Biology
Maher Sanctuary, Grand Rapids Audubon Club
Abstract provided by DBpedia licensed under a Creative Commons License