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Umbrella Flatsedge
Cyperus diandrus

Umbrella flat sedge is an ornamental grass often seen at the edges of rivers and ponds. It is a warm season perennial and grows best in USDA zones 8 to 11. The plant may become invasive in some areas, so it is important to become familiar with the plant and recognize its characteristics before adding it to your garden area.

USDA symbol: CYDI3

General Information

Plant TypeGrass
Height1 to 2 feet
Light ExposureSun
Soil MoistureWet
Bloom ColorYellow
Umbrella Flatsedge (Umbrella Flatsedge<div><em class="small">Cyperus diandrus</em></div>)
Photo credit: Minnesota Wildflowers (Click to enlarge)


Flooding / Inundation ToleranceModerate
General Resilience6
Salt ToleranceUnknown
Stress ToleranceGeneral Disturbance

Pollinator Value: None Known

Bloom MonthsJune to August

Project Planning

Project TypeShoreline Buffer
Coefficient of Conservatism6
Herbivore SensitivityLow
Rate of SpreadMedium
Vegetative ReproductionAbsent


CountyAitkin, Anoka, Benton, Big Stone, Blue Earth, Carver, Cass, Chisago, Clearwater, Crow Wing, Dakota, Freeborn, Goodhue, Hennepin, Houston, Itasca, Kandiyohi, Lake, Le Sueur, Lincoln, Mille Lacs, Morrison, Pine, Ramsey, Rice, Sherburne, Stearns, Steele, Todd, Waseca, Washington, Winona, Wright, Yellow Medicine
EcoregionDriftless Area, Lake Agassiz Plain, North Central Hardwood Forests, Northern Glaciated Plains, Northern Lakes and Forests, Northern Minnesota Wetlands, Western Cornbelt Plains
Approximate Eco ProvinceEastern Broadleaf Forest, Laurentian Mixed Forest, Prairie Parkland, Tallgrass Aspen Parklands