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Great Plains Flatsedge

Cyperus lupulinus

Last reviewed: August 2026

Great Plains Flatsedge (Cyperus lupulinus)
Photo: (c) aarongunnar, some rights reserved (CC BY), uploaded by aarongunnar

Toxicity unknown

Great Plains Flatsedge (Cyperus lupulinus) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

full sun

Water

medium

Size

6"–24" H × 4"–12" W

Bloom

Jun, Jul, Aug, Sep

Native to

AR, CO, CT, DE and 28 more states

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 445 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Southern RockiesSouthwestern TablelandsCentral Great PlainsGreat PlainsCross TimbersEdwards PlateauTexas Blackland PrairiesEast Central Texas PlainsSouth Central PlainsEastern Temperate ForestsOzark HighlandsCentral Irregular PlainsPiedmontWestern Corn Belt PlainsNorthern Lakes and ForestsNorth Central Hardwood ForestsDriftless AreaSoutheastern Wisconsin Till PlainsCentral Corn Belt PlainsEastern Corn Belt PlainsSouthern Michigan/Northern Indiana Drift PlainsHuron/Erie Lake PlainsNortheastern HighlandsNortheastern Coastal ZoneNorthern ForestsMiddle Atlantic Coastal PlainNorthern PiedmontSoutheastern PlainsBlue RidgeRidge and ValleyWestern Allegheny PlateauInterior River Valleys and HillsMississippi Alluvial PlainMississippi Valley Loess PlainsAcadian Plains and HillsEastern Great Lakes LowlandsAtlantic Coastal Pine Barrens

Great Plains flatsedge is a compact native sedge that forms neat clumps of narrow, grass-like foliage. It produces small, inconspicuous flower clusters from summer through early fall and thrives in sunny locations with moderate moisture.

In an HOA neighborhood

Great Plains Flatsedge takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

  • Sedges often perceived as weedy by HOAs
  • Uncommon plant may raise questions
  • Can look untidy during dormant season

Wildlife value

This sedge provides habitat and food for various insects and small wildlife, though it is not a major pollinator plant due to its wind-pollinated flowers.

Common questions

How much sun does Great Plains Flatsedge need?
Great Plains Flatsedge grows best in full sun conditions.
When does Great Plains Flatsedge bloom?
Great Plains Flatsedge blooms in June, July, August, and September.
Where is Great Plains Flatsedge native?
Great Plains Flatsedge (Cyperus lupulinus) is native to AR, CO, CT, DE and 28 more states, per the World Checklist of Vascular Plants (Kew).
Is Great Plains Flatsedge HOA-friendly?
Great Plains Flatsedge takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow Great Plains Flatsedge? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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