Salt Meadow Cordgrass
Why Is It a Noxious Weed?
In general, the Spartina genus is considered highly invasive and one of the most aggressive worldwide. Spartina displaces native species, destroys wildlife habitat, interferes with recreational activities and is difficult and expensive to control.
How would I identify it?
Salt meadow cordgrass is an upright, rhizomatous grass, 1 to 4 feet tall. The plant forms dense stands.
Flowers occur in two to several spikes that are pressed together to somewhat spreading.
The leaves are hairless, blades are 3.9-19.7 inches (10-50 cm) long, by 0.002-0.16 (0.28) inches (0.5-4(7) mm) wide. When young the leaf blades are in-rolled and have ridges. The ligules consist of a fringe of hairs, 0.02 inches long.
Stems are slender, solitary or in small clumps with firm internodes.
Where does it grow?
As its common name implies, it dominates the upper salt marsh. It also will colonize on sand dunes, swale grasslands, sand flats and coastal scrublands. Please click here to see a county level distribution map of salt meadow cordgrass in Washington.
How Does it Reproduce?
Salt meadow cordgrass reproduces mainly by its rhizomes, although it does produce viable seed.
How Do I Control It?
General Control Strategy
Seedlings can be pulled out effectively though care should be taken to remove both shoots and roots. Covering small clones with woven geotextile fabric has been successful on Spartina patens. Mowing infestations can contain growth, limit seed set and eventually kill the plants. To be effective, clones must be mowed repeatedly, beginning with initial spring green-up and continued until fall die-back. In some cases, repeated mowing will be required for three or four years.
Diking can be used as a containment measure, since dikes confine the lateral spread of rhizomes. Diking blocks tidal flow, which stops nutrient flow and oxygen exchange. Prolonged flooding may eventually kill Spartina and other species that cannot tolerate standing water.
Several insects feed on Spartina patens in its native range. Currently, the distribution of S. patens in Washington is too small to require the use of classical biological control.
For More Information
See our Written Findings for more information about salt meadow cordgrass (Spartina patens).
Whatcom County NWCB Fact Sheet on Spartina spp.