Cormous, perennial, herb, to 2.5 m high. Fl. white/cream/pink/purple/red, Sep to Nov. White sand, grey sandy clay, brown gravelly sand, grey-brown alluvium, granite. Hills & flats, along river banks & lake edges, road verges.
Beard’s Provinces: South-West Province.
IBRA Regions: Jarrah Forest, Swan Coastal Plain, Warren.
IBRA Subregions: Northern Jarrah Forest, Perth, Southern Jarrah Forest, Warren.
IMCRA Regions: Leeuwin-Naturaliste, WA South Coast.
Local Government Areas (LGAs): Albany, Augusta-Margaret River, Dardanup, Denmark, Donnybrook-Balingup, Gosnells, Harvey, Manjimup, Mundaring, Plantagenet, Serpentine-Jarrahdale.
Alternative Names. Pink Watsonia.
General Biology. Growth form. Geophyte. Life form. Annually renewed corm, some dormancy between fire. Reproduction. Offsets, possibly seed. Dispersal. Wind, water, soil. Time to first flowering. 2-3 years. Seedbank persistence. Medium, 1-5 years. Fire response. Generally survives fire. Prolific flowering and seed set follow summer fire.
Notes. In South Africa it has been noted Watsonia borbonica is particularly abundant after fire and is known at some sites to only flower in the first and second years following fire. The increased flowering post fire is followed by prolific seed production.
Additional information. Origin. Southern Africa. History of use/introduction. Garden escape. Similar exotic species. Watsonia meriana, W. versfeldii.
Suggested method of management and control. Wipe individual leaves with glyphosate 10% or spray dense infestations 2,2-DPA 10 g/L + Pulse®. Apply just as flower spikes emerge at corm exhaustion. 2,2-DPA at 5 g/L+ Pulse® is also quite effective and is appropriate to use when particularly concerned about off-target damage, for example following fire when Watsonia is growing among germinating native seedlings and resprouting native shrubs. 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/