Agrostis gigantea, known by its common name Black Bent, 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 Although it has largely been replaced by soybeans and more palatable grasses, it still gets some use in poor soils.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.

It can be found in open woodland, rough grassland, hedgerows, roadsides and waste ground, and as a weed on arable land.

This species is similar to Agrostis stolonifera, with the key difference being that the latter has stolons. In fact the two are sometimes treated as a single species, and it is not always clear precisely what an author means by Agrostis alba or Agrostis stolonifera.

Many internet sources describe Agrostis capillaris as being the tallest of the bent species. However C E Hubbard describes its height as ranging from 10 to 70cm high, whereas Agrostis gigantea is 40 to 120 cm. Marjorie Blamey, Richard and Alastair Fitter also describe Black Bent as being taller.

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