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Cyperus eragrostis
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Tall Flatsedge
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Cyperus eragrostis

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About Tall Flatsedge (Cyperus eragrostis) Cyperus eragrostis is a species in the Cyperaceae (Sedge) family known by several common names, including tall flatsedge, Nutsedge and Tall Cyperus. It is almost always found in wetland-riparian areas where it can spread rapidly. It is a green sedge with tall, erect stems, and long, thin, pointed leaves. Its flowers are found within tough, rounded, greenish-yellow or beige spikelets. This species is originally native to the western United States but it has become naturalized across North America, Europe, and parts of South America and Australia. It can become a weed where it is introduced; it has been known to infest rice fields.
Plant Description
Plant Type

Max. Height
3 ft (0.9 m)

Max. Width
30 ft (9.1 m)

Growth Rate


Flower Color
Green, Yellow

Flowering Season
Spring, Summer, Fall

Native Status

Natural Setting
Site Type
Vernal pools, streambanks, ditches and other wet areas


Elevation ?
-42' - 5105'

Annual Precip. ?
2.6" - 90.5"

Summer Precip. ?
0.15" - 2.51"

Coldest Month ?
38.4° F - 59.1° F

Hottest Month ?
57.7° F - 88.0° F

Humidity ?
0.01 vpd - 38.29 vpd

Soil Description
Tolerates a variety of soils

Soil PH
5.0 - 8.0


Cold Tolerance(° F)
Tolerates cold to 15° F

Companion Plants
Use caution in planting where it may spread out of control. Plant in constantly wet areas with other wetland-riparian trees and shrubs such as Maples (Acer sp.), Alders (Alnus sp.), Dogwood (Cornus sp.), California Walnut (Juglans californica or hindsii), Sycamore (Platanus racemosa), Cottonwood (Populus sp.), Currant/Gooseberry (Ribes sp.), wild Rose (Rosa sp.), Willows (Salix sp.), and wild grape (Vitis californica or girdiana). Also works well with various other wetland grasses and grass-like plants such as Spikerush (Eleocharis sp.) and Rushes (Juncus sp.)

Landscaping Information
Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Seldom Used

Max. Summer Water ?
Keep moist
No Summer Water
Keep moist

Common uses
Bogs and Ponds

Nursery Availability
Commonly Available

Other Names
Common Names
Tall Cyperus, Nutsedge

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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