Erect annual, herb, to 1.5 m high. Fl. yellow, Jan to Dec. Variety of soils. Weed of waste places & disturbed ground.
Beard’s Provinces: Eremaean Province, Northern Province, South-West Province.
IBRA Regions: Avon Wheatbelt, Carnarvon, Central Ranges, Coolgardie, Dampierland, Esperance Plains, Gascoyne, Geraldton Sandplains, Great Victoria Desert, Hampton, Jarrah Forest, Little Sandy Desert, Mallee, Murchison, Nullarbor, Ord Victoria Plain, Pilbara, Swan Coastal Plain, Victoria Bonaparte, Warren, Yalgoo.
IBRA Subregions: Ashburton, Avon Wheatbelt P1, Avon Wheatbelt P2, Cape Range, Carnegie, Central, Central band, Nullarbor Plain, Chichester, Dandaragan Plateau, Eastern Goldfield, Eastern Mallee, Eastern Murchison, Edel, Fitzgerald, Geraldton Hills, Hamersley, Hampton, Lesueur Sandplain, Mann-Musgrave Block, Mardabilla, Northern band, Carlisle, Northern Jarrah Forest, Ord, Ord-Victoria Plains P1, Perth, Pindanland, Recherche, Roebourne, Rudall, Shield, Southern Cross, Southern Jarrah Forest, Tallering, Trainor, Victoria Bonaparte P1, Warren, Western Mallee, Western Murchison, Wooramel.
IMCRA Regions: Abrolhos Islands, Central West Coast, Eucla, Leeuwin-Naturaliste, Pilbara (offshore), Shark Bay, WA South Coast, Zuytdorp.
Local Government Areas (LGAs): Albany, Armadale, Ashburton, Augusta-Margaret River, Bayswater, Beverley, Boddington, Bridgetown-Greenbushes, Broome, Bruce Rock, Bunbury, Busselton, Cambridge, Capel, Carnamah, Carnarvon, Chapman Valley, Chittering, Cockburn, Collie, Coolgardie, Coorow, Corrigin, Cuballing, Cue, Dalwallinu, Dandaragan, Dardanup, Denmark, Donnybrook-Balingup, Dundas, East Pilbara, Esperance, Exmouth, Gingin, Gnowangerup, Goomalling, Gosnells, Greater Geraldton, Halls Creek, Harvey, Irwin, Jerramungup, Kalamunda, Kalgoorlie-Boulder, Kent, Kondinin, Koorda, Kulin, Kwinana, Lake Grace, Laverton, Leonora, Mandurah, Manjimup, Meekatharra, Melville, Menzies, Merredin, Mingenew, Moora, Morawa, Mount Magnet, Mount Marshall, Mundaring, Murray, Nannup, Narrogin, Nedlands, Ngaanyatjarraku, Northam, Northampton, Perth, Pingelly, Ravensthorpe, Rockingham, Shark Bay, South Perth, Swan, Trayning, Upper Gascoyne, Victoria Plains, Vincent, Wanneroo, Waroona, West Arthur, Westonia, Williams, Wiluna, Wongan-Ballidu, Woodanilling, Wyalkatchem, Wyndham-East Kimberley, Yalgoo, Yilgarn, York.
General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed. Dispersal. Wind. Seedbank persistence. 1-2 years.
Notes. May be biennial. A single plant may produce up to 8,000 seeds. Seed is able to germinate all year round over a broad range of temperatures and is favored by light, with emergence highest in seed present on the soil surface. Resistance to herbicides such as chlorsulfuron and atrazine has led to Sowthistles, including Sonchus oleraceus, being the target of biological control programs overseas and in Australia. Preliminary surveys for suitable control agents found two potential organisms: a rust fungus and eriophyid mite. Hybridises with S. asper.
Additional information. Similar exotic species. Sonchus asper. Similar native species. S. hydrophilus.
Suggested method of management and control. Remove small and/or isolated populations manually prior to seed set. Slashing is often ineffective as flowers continue to be produced. Spot spray Lontrel® 10 ml/10 L + wetting agent preferably at the rosette stage. 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/