must be secured in place with a thin mulch or mat to are downstream. Consult with your local Extension prevent it from floating or washing away. The hull Service agent, weed control handbook, or other experts detaches readily but can be left intact. There are for advice. approximately 215,000 to 360,000 (± 20%) seeds per Cultivars, Improved, and Selected Materials (and area pound with and without hulls, respectively. A seeding of origin) rate of one pound pure live seed per acre will result in Seeds, plugs, or containers are usually available from about 5 to 8 live seeds per square foot. Actual seeding commercial sources, but seed is often expensive. rates will depend on methods, objectives, and site conditions. Western mannagrass is easily propagated by Prepared By: division or as container stock sown from seed and USDA NRCS Plant Materials Center, Dale Darris, maintained in shallow standing water. Corvallis, Oregon Management Western mannagrass can be grown and maintained under Citation continuously moist, saturated, or seasonally to Darris, D. 2005. Plant fact sheet for western mannagrass permanently flooded conditions. Regeneration and spread (Glyceria USDA-Natural Resources occidentalis). is favored by wet open areas and disturbance. Water Conservation Service, Plant Materials Center, Corvallis, impoundments or other controlled wetlands should not be OR. allowed to dry out, especially if viable seed has not yet Published January 2005 formed. Edited: 21Mar2006 jsp; 17Sep2008 dcd; 19Sep2008 jsp; 17Feb2012 Environmental Concerns aym Seed is difficult to collect in the wild. Western For more information about this and other plants, please mannagrass is a serious weed in low lying, poorly drained contact your local NRCS field office or Conservation fields of introduced grasses grown for seed in . Some District <>, and visit the PLANTS Web site <> or the strains may be herbicide resistant. Riparian wetland and Plant Materials Program Web site < stream restoration projects should consider substituting other native grasses if ryegrass (Lolium spp.) seed fields USDA IS AN EQUAL OPPORTUNITY PROVIDER AND EMPLOYER
must be secured in place with a thin mulch or mat to prevent it from floating or washing away. The hull detaches readily but can be left intact. There are approximately 215,000 to 360,000 (± 20%) seeds per pound with and without hulls, respectively. A seeding rate of one pound pure live seed per acre will result in about 5 to 8 live seeds per square foot. Actual seeding rates will depend on methods, objectives, and site conditions. Western mannagrass is easily propagated by division or as container stock sown from seed and maintained in shallow standing water. Management Western mannagrass can be grown and maintained under continuously moist, saturated, or seasonally to permanently flooded conditions. Regeneration and spread is favored by wet open areas and disturbance. Water impoundments or other controlled wetlands should not be allowed to dry out, especially if viable seed has not yet formed. Environmental Concerns Seed is difficult to collect in the wild. Western mannagrass is a serious weed in low lying, poorly drained fields of introduced grasses grown for seed in . Some strains may be herbicide resistant. Riparian wetland and stream restoration projects should consider substituting other native grasses if ryegrass (Lolium spp.) seed fields are downstream. Consult with your local Extension Service agent, weed control handbook, or other experts for advice. Cultivars, Improved, and Selected Materials (and area of origin) Seeds, plugs, or containers are usually available from commercial sources, but seed is often expensive. Prepared By: Dale Darris, USDA NRCS Plant Materials Center, Corvallis, Oregon Citation Darris, D. 2005. Plant fact sheet for western mannagrass (Glyceria occidentalis). USDA-Natural Resources Conservation Service, Plant Materials Center, Corvallis, OR. Published January 2005 Edited: 21Mar2006 jsp; 17Sep2008 dcd; 19Sep2008 jsp; 17Feb2012 aym For more information about this and other plants, please contact your local NRCS field office or Conservation District <>, and visit the PLANTS Web site <> or the Plant Materials Program Web site < USDA IS AN EQUAL OPPORTUNITY PROVIDER AND EMPLOYER