Rhizomatous, stoloniferous perennial, grass-like or herb, 0.1-0.6 m high. Fl. green/green-purple, Dec or Jan to Mar. Calcareous sand, sandy clay. Lagoon margins, swamps, rivers, creeks.
Alternative Names. Saltwater paspalum, salt couch, salt couch turf, biscuit grass.
General Biology. Growth form. Grass. Life form. Perennial, stoloniferous. Reproduction. Stem fragments, rhizomes, seed. Dispersal. Water, inappropriate plantings, soil movement. Photosynthetic Pathway. C4.
Notes. Naturalised in South Africa, Hawaii and New Zealand. Salt tolerant species that has become naturalised in coastal environments. Known to alter the structure and composition of native flora, reduce habitat for shorebirds and fish, invertebrate populations, and change sediment accumulation and estuarine hydrology. Able to establish in coastal vegetation including mangroves, mud flats, shrubland, salt marsh, beaches and sandunes. Strongly invasive in estuarine and estuarine margin environments. Is an early coloniser of bare soil and once established can exclude other species for many years. Develops dense swards. Tolerant of a wide range of conditions such as drought, saline or recycled water, varying soil pH, extended periods of low light intensity, flooding or extended wet periods. Various genotypes with greater salinity tolerance have been developed. Resistant to insects and disease. Primary mode of reproduction is asexual.
Additional information. Origin. North and South America, possibly Europe. History of use/introduction. Lawn/turf, landscaping and revegetation, erosion control, forage, wetland restoration, site reclamation, recovery of salt-affected lands. Similar exotic species. Paspalum distichum.
Suggested method of management and control. Avoid removing manually or mechanically as there is a risk of spreading plants from resprouting root fragments. Spray with glyphosate 1% 2-3 times over single growing season. Read the manufacturers' labels and material safety data sheets before using herbicides. For further information consult the Australian Pesticides and Veterinary Medicines Authority to determine the status of permits for your situation or state.
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.