Glyceria grandis S. Watson
American mannagrass, American manna grass, Tall manna grass, Reed meadowgrass
Poaceae (Grass Family)
USDA Symbol: GLGR
American manna grass is a perennial grass which spreads by both thick rhizomes and stolons. Thick, stout, culms are 40-60 in. tall and sometimes decumbent at the base. The large, showy, openly branched, purplish panicle is up to 16 in. long and nods at the summit.
Cool-season grass has broad, pale leaves and very loose, open flowering stalks. Important member of wetland communities. (Ontario Native Plants 2002)
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Root Type: Fibrous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Venation: Parallel
Fruit Type: Caryopsis
Size Class: 3-6 ft.
Bloom InformationBloom Color: Purple
Bloom Time: May , Jun , Jul , Aug
DistributionUSA: AK , AZ , CA , CO , CT , IA , ID , IL , IN , MA , MD , ME , MI , MN , MS , MT , ND , NE , NH , NJ , NM , NV , NY , OH , OR , PA , RI , SD , TN , UT , VA , VT , WA , WI , WV , WY
Canada: NB , NL , NS , ON , PE , QC
Native Distribution: Canada, s. to VA, TN mts., n. IL, NE, NM, AZ & CA
Native Habitat: Stream banks; non-tidal marshes; lake margins
Growing ConditionsLight Requirement: Sun
Soil Moisture: Wet
Soil Description: Wet soils.
Conditions Comments: A rapidly growing grass.
PropagationDescription: Not Available
Seed Collection: Not Available
Seed Treatment: Not Available
Commercially Avail: yes
Find Seed or Plants
Find seed sources for this species at the Native Seed Network.
National Wetland Indicator Status
From the National Suppliers DirectoryAccording to the inventory provided by Associate Suppliers, this plant is available at the following locations:
Ohio Prairie Nursery - Hiram, OH
From the National Organizations DirectoryAccording to the species list provided by Affiliate Organizations, this plant is on display at the following locations:
North American Native Plant Society - Etobicoke, ON
Native Seed Network - Corvallis, OR
BibliographyBibref 841 - Native Alternatives to Invasive Plants (2006) Burrell, C. C.
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Additional resourcesUSDA: Find Glyceria grandis in USDA Plants
FNA: Find Glyceria grandis in the Flora of North America (if available)
Google: Search Google for Glyceria grandis
MetadataRecord Modified: 2015-04-16
Research By: TWC Staff