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Spike Bentgrass
Agrostis exarata

About Spike Bentgrass (Agrostis exarata) Agrostis exarata is a species of grass known by the common names Pacific bentgrass, spike bentgrass, and spike redtop. It is native to western North America from Texas to the Aleutian Islands. This is a common perennial grass reaching one to three feet in height with long, thin, flat leaves each with a ligule of 2 to 4 millimeters. The tuft flower cluster may be up to 30 centimeters long and is usually dense with tiny spikelets. It reproduces mainly by seed, but it can also spread via rhizome. This bunchgrass occurs in many plant communities in varied climates. It is considered good forage for livestock.
Plant Description
Plant Type

Max. Height
1 - 3.3 ft (0.3 - 1 m)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Open disturbed places

Sun, Part Shade

Elevation ?
-3' - 14090'

Annual Precip. ?
5.0" - 152.5"

Summer Precip. ?
0.15" - 5.82"

Coldest Month ?
10.0° F - 61.0° F

Hottest Month ?
33.4° F - 88.0° F

Humidity ?
0.01 vpd - 41.78 vpd

Soil Description
Adaptable, tolerant of sand, loam and clay

Landscaping Information
Propagation ?
For propagating by seed: No treatment.

Other Names
Botanical Names
Agrostis exarata var. monolepis

Common Names
Pacific Bentgrass, Spike Redtop

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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