Tufted annual, grass-like or herb, 0.02-0.4 m high. Fl. green, Aug to Dec or Jan to Feb. White, grey, black or peaty sand, sandy clay, sandy loam. Lawns, disturbed areas, swamps, outcrops.
Beard’s Provinces: Eremaean Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Hampton, Jarrah Forest, Mallee, Swan Coastal Plain, Warren.
IBRA Subregions: Avon Wheatbelt P1, Avon Wheatbelt P2, Dandaragan Plateau, Eastern Mallee, Fitzgerald, Geraldton Hills, Hampton, Lesueur Sandplain, Mardabilla, Northern Jarrah Forest, Perth, Recherche, Southern Cross, Southern Jarrah Forest, Warren, Western Mallee.
IMCRA Regions: Abrolhos Islands, Central West Coast, Leeuwin-Naturaliste, Shark Bay, WA South Coast.
Local Government Areas (LGAs): Albany, Armadale, Augusta-Margaret River, Belmont, Busselton, Canning, Capel, Chapman Valley, Chittering, Cockburn, Coolgardie, Cranbrook, Dandaragan, Dardanup, Denmark, Dowerin, Dundas, Esperance, Gingin, Gosnells, Greater Geraldton, Harvey, Joondalup, Kalamunda, Kent, Kulin, Manjimup, Melville, Murray, Nannup, Narrogin, Nedlands, Northam, Northampton, Perth, Ravensthorpe, Rockingham, Serpentine-Jarrahdale, Shark Bay, South Perth, Stirling, Swan, Vincent, Wandering, West Arthur, Yilgarn.
Alternative Names. Annual blue grass, bluegrass, annual meadow grass.
General Biology. Growth form. Grass. Life form. Annual, caespitose. Reproduction. Seed. Dispersal. Wind, water, birds, contaminated seed, on footware and clothing, mowers and other equipment. Photosynthetic Pathway. C3. Seedbank persistence. 4-6 years.
Notes. Generally a weed of disturbed sites usually with limited impact on native plant communities. Survives as a weed due to high genotypic and phenotypic variability, rapid germination, survival when uprooted and tolerance to compacted soils. Grows aggressively under moist conditions, good levels of soil nitrogen and phosphate and is not adversely affected by most mowing heights. Tolerates a wide range of climatic conditions, making it a potentially invasive species for a range of areas including the Sub-Antarctic Islands. Can flower and establish at any time of the year, although this is less likely under dry conditions. Generally has high seed production. Seed has generally high viablity and staggered germination. Most seed germinates within the first year and when soil is wet during the winter months.
Additional information. History of use/introduction. Potential seed contaminant. Similar exotic species. Poa pratensis.
Suggested method of management and control. Light infestations can be hand weeded. Susceptible to many herbicides, however some grass-selective herbicides such as fluazifop (Fusilade® Forte) can give poor control. 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.
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Western Australian Herbarium (1998–). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions. https://florabase.dpaw.wa.gov.au/