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Great Bur Reed

Sparganium eurycarpum

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Category
Forb / Wildflower
Sun
Full
Soil moisture
Wet
Bloom time
Jun–Aug
Bloom color
White
Notes
Rhizmatous

About Great Bur Reed

Great Bur Reed is a commanding emergent aquatic perennial that brings a structural, almost prehistoric beauty to water features and marshy areas. Growing up to four feet tall, this plant features stout, lime-green stems and alternate, grass-like leaves that remain vibrant throughout the season. Its most distinctive feature is the spherical flower heads—initially white and fuzzy, they transform into spiked green balls before maturing into a rich, contrasting brown. Native to wetlands across much of North America, it thrives in full sun and saturated soils, even tolerating standing water. Ecologically, it is a powerhouse; muskrats and other aquatic mammals feed on its foliage and rhizomatous roots, while the large, starchy seeds are a critical food source for migrating waterfowl. For home gardeners, it is an excellent choice for stabilizing pond edges or filling in consistently wet low spots where other plants might struggle, offering both dramatic visual appeal and significant ecological value.

Native range

Native to 39 states:

ArizonaCaliforniaColoradoConnecticutD.C.DelawareIowaIdahoIllinoisIndianaKansasKentuckyMassachusettsMarylandMaineMichiganMinnesotaMissouriMontanaNorth DakotaNebraskaNew HampshireNew JerseyNew MexicoNevadaNew YorkOhioOklahomaOregonPennsylvaniaRhode IslandSouth DakotaUtahVirginiaVermontWashingtonWisconsinWest VirginiaWyoming

County range map

BONAP county-level native range map for Sparganium eurycarpum

Range map courtesy of BONAP (Biota of North America Program).

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