|Common name:||African daisy|
|Scientific name:||Senecio pterophorus DC.|
|Other scientific name/s:|
|Other common name/s:||winged groundsel|
Catchment management authority boundaries
|Regionally prohibited in the Wimmera, North Central, Corangamite, Goulburn Broken, North East and West Gippsland Catchments|
|Regionally controlled in the Glenelg Hopkins, Port Phillip and Western Port Catchments|
|Restricted in the Mallee and East Gippsland Catchments|
Herbaceous plant - Forb (flowering herbaceous plant - not a grass)
Erect perennial herb or shrub
African daisy has several stems growing from a central crown, generally 1-1.5 m high but can reach a height of up to 3 m.
When young, stems are soft and sappy. When mature, stems are stout and woody and grey-green to green in colour. They have parallel, raised ridges (or wings) that run the length of the stem and are serrated on the lower sections.The stems of the young plants are usually covered with white hairs like cobwebs but become smooth and hairless upon maturity.
Leaves are dark green on the upper surface, leathery and rough, becoming hairless and often shiny.
The underside of the leaf is covered with dense white or grey woolly hairs.Narrow, lanceolate (lance-shaped) leaves, 50-120 mm long, and 3-25 mm (typically 7-15 mm) wide. Leaf margins have 2 to 8 forwardly directed teeth. Upper leaves may not have teeth.
Numerous yellow, flattened heads of between 50-300 mm across at the ends of the stems.Each head consists of 40-200 or more flowers. Flowers are bell-shaped, 12-15 mm wide, each surrounded by 18-22 bracts with hairy brown tips and up to 20 shorter, smaller bracteoles.
Seeds are 1.5-2 mm long, oblong to cylindrical in shape and brown or reddish-brown in colour. They have a pappus of fine hairs to 5 mm long that is readily detached.Seeds tolerate intermittent water logging and ranges in salinity between moderate to quite high.
Growth and lifecycle
Method of reproduction and disperal
The pappus of the seed is easily shed, so seed are rarely dispersed far from the parent plant by wind. Some dispersal can occur through seed moving in water over the ground. Seeds are also carried in mud which is stuck to animals, clothing and machinery or in contaminated agricultural produce and road-making materials.
Rate of growth and spread
Seedlings establish quickly and compete aggressively with developing pastures and crops.
Seedbank propagule persistence
Mature plants may persist for 7-10 years and produce approximately 50,000 seeds annually, with up to 80 per cent of seeds germinating in autumn.
African daisy grows well in lowland grassland, grassy woodlands and dry sclerophyll forests.
It prefers humid and sub humid subtropical and warm-temperate savannahs, where it is mainly found on medium and lighter soil types.
It occurs as a weed of disturbed soils along roadsides and in denuded grazing land, newly-sown pastures, forest margins and wastelands. Also after events such as bushfires and clearing.
Numerous infestations of African daisy have been found in Victoria: in the southern Wimmera and South West, the Avoca-Maryborough-Clunes area, in areas near Horsham, Dandenong, Bendigo, Mildura and in the Port Phillip region.
The icons on the calendar below represent the times of year for flowering, seeding, germination, the dormancy period of African daisy and also the optimum time for treatment.
Impact on ecosystems and waterways
African daisy is a strong competitor in natural environments and forms dense thickets that exclude native plant species, resulting in a reduction in habitat.
Agricultural and economic impacts
It contains toxic alkaloids but is rarely eaten by grazing livestock and competes aggressively with developing pastures and crops, often becoming dominant in the early years rendering infested lands unproductive.
Prescribed measures for the control of noxious weeds
- Application of a registered herbicide
- Physical removal.
Other management techniques
Changes in land use practices and spread prevention may also support African daisy management after implementing the prescribed measures above.
Carr, G.W., Yugovic, J.V. and Robinson, K.E. (1992). Environmental weed invasions in Victoria: Conservation and management implications, Department of Conservation and Natural Resources and Ecological Horticulture, Victoria.
Parsons, W.T. and Cuthbertson, E.G. (1992). Noxious Weeds of Australia. Melbourne, Inkata Press.
Department of Primary Industries, Landcare Notes, African Daisy LC0196, Updated August 2007.
Department of Primary Industries, website, http://www.dpi.vic.gov.au/dpi/vro/vrosite.nsf/pages/ invasive_african_daisy
Department of Primary Industries, Regionally Prohibited Weeds Information Sheet - African Daisy, 2010.