← Back to Plant Finder

American Mannagrass
Glyceria grandis

Loosely clumped, perennial grass with culms growing 4-6' tall. Giant manna grass has been used for wetland restorations, especially in marches, ditches and fens. A good forage material for wildlife, and seems to increase with trampling and grazing.

USDA symbol: GLGR

General Information

Plant TypeGrass
Height3 to 5 feet
Light ExposureSun
Soil MoistureWet
Bloom ColorGreen
American Mannagrass (American Mannagrass<div><em class="small">Glyceria grandis</em></div>)
Photo credit: Minnesota Wildflowers (Click to enlarge)

Tolerances

Flooding / Inundation ToleranceHigh
General Resilience5
Salt ToleranceLow
Stress ToleranceGeneral Disturbance

Pollinator Value: Low

Bloom MonthsJuly to September

Project Planning

Project TypeBoulevard, Restoration
Coefficient of Conservatism5
Herbivore SensitivityHigh
LifespanPerennial
Rate of SpreadSlow
Vegetative ReproductionClonal

Range

CountyAitkin, Anoka, Becker, Beltrami, Benton, Blue Earth, Carlton, Carver, Cass, Chippewa, Chisago, Clay, Clearwater, Cook, Crow Wing, Dodge, Douglas, Fillmore, Freeborn, Goodhue, Grant, Hennepin, Houston, Hubbard, Isanti, Itasca, Jackson, Kanabec, Kandiyohi, Kittson, Koochiching, Lake, Lake of the Woods, Lincoln, Marshall, Martin, Meeker, Mille Lacs, Morrison, Mower, Murray, Nicollet, Nobles, Norman, Olmsted, Otter Tail, Pine, Pipestone, Pope, Ramsey, Red Lake, Redwood, Renville, Rice, Roseau, Scott, Sherburne, St. Louis, Stearns, Steele, Todd, Wabasha, Wadena, Waseca, Washington, Watonwan, Wilkin, 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