Spartina alterniflora Loisel.
Saltmarsh Cordgrass, Saltwater Cordgrass, Salt Cordgrass, Smooth Cordgrass
Poaceae (Grass Family)
Synonym(s): Spartina alterniflora var. glabra, Spartina alterniflora var. pilosa
USDA Symbol: spal
The dominant grass in coastal plains of eastern North America, Saltmarsh Cordgrass grows 3 to 8 feet tall in moist, sandy coastal regions that are brackish to very salty. Its leaves are green with silvery white undersides. Flowers are 4 to 12 inch spikes appearing late summer through fall, with seeds ripening soon after. Roots are deep and fibrous, with rhizomatous colonization.
A great plant for wildlife gardens in coastal areas of eastern North America, Saltmarsh Cordgrass requires full sun, moist to wet, preferably sandy soil, and lots of room, as it tends to form thick mats over time. The silvery undersides of its leaves are attractive in the wind and make a handsome addition to a coastal prairie garden, especially when combined with fall-blooming perennials like goldenrod and gayfeather.
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Plant CharacteristicsDuration: Perennial
Root Type: Fibrous
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Venation: Parallel
Fruit Type: Caryopsis
Size Notes: Normally 3 to 6 feet tall, but can grow to 8 feet, or can remain at less than 2 feet if ground is extremely salty.
Leaf: Green with silvery underside
Size Class: 3-6 ft.
Bloom InformationBloom Color: Yellow
Bloom Time: Apr , May
DistributionUSA: AL , CA , CT , DE , FL , GA , LA , MA , MD , ME , MS , NC , NH , NJ , NY , RI , SC , TX , VA , WA
Canada: NB , NL , NS , PE
Native Distribution: Atlantic Provinces of Canada south to coastal Texas and south to South America. Zones 5 to 9.
Native Habitat: Salt and brackish tidal marshes (mid-tide up to Mean High Tide level). Also seasonally flooding coastal savanna with scattered Coastal Live Oaks (Quercus virginiana).
Growing ConditionsWater Use: High
Light Requirement: Sun
Soil Moisture: Wet
Soil pH: Alkaline (pH>7.2) , Acidic (pH<6.8)
CaCO3 Tolerance: Low
Drought Tolerance: Low
Soil Description: Clay, Loam, Sand, Brackish to Salty
BenefitUse Ornamental: The dominant grass in Southeastern coastal areas, this grass would do well in coastal prairie gardens. Its silvery leaves combine well with fall-blooming perennials like Liatris and Solidago.
Use Wildlife: Geese feed on roots in winter. Leaves browsed by muskrats and deer. Seeds eaten by a variety of birds.
Interesting Foliage: yes
Deer Resistant: No
Butterflies and Moths of North America (BAMONA)
Louisiana eyed silkmoth |
Learn more at BAMONA
PropagationPropagation Material: Root Division
Mr. Smarty Plants says
When to plant grasses on Long Island, NY
December 06, 2009
Dear Mr. Smarty Plants; Are there any grass seeds that I can plant NOW, early December, on Long Island, NY? The planting environment is on and near a sandy bluff on a bayshore, where it can be windy ...
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National Wetland Indicator Status
BibliographyBibref 1186 - Field Guide to Moths of Eastern North America (2005) Covell, C.V., Jr.
Bibref 1185 - Field Guide to Western Butterflies (Peterson Field Guides) (1999) Opler, P.A. and A.B. Wright
Bibref 1620 - Gardening with Native Plants of the South (Reprint Edition) (2009) Wasowski, S. with A. Wasowski
Search More Titles in Bibliography
Additional resourcesUSDA: Find Spartina alterniflora in USDA Plants
FNA: Find Spartina alterniflora in the Flora of North America (if available)
Google: Search Google for Spartina alterniflora
MetadataRecord Modified: 2015-12-14
Research By: TWC Staff