Decumbent or ascending annual, herb, 0.03-0.3 m high. Fl. yellow, Aug to Nov. Weed of roadsides, waste places & cultivated land.
Alternative Names. Cape Dandelion, Plain Treasure-flower, Fertile Capeweed.
General Biology. Growth form. Herb. Life form. Annual. Reproduction. Seed, stolons. Dispersal. Wind, water, movement of contaminated soil or mud, animals. Toxicity. Can be poisonous to mammals, through accumulating potentially toxic levels of nitrate. Seedbank persistence. Highly variable, but may be up to 8 years.
Notes. Widespread and common in temperate areas. Can be biennial. Colonises bare soil and disturbed sites. It is likely to impact on soil moisture and nutrient availability, however does not seems to compete well in natural undisturbed ecosystems. Seems to be a relatively poor competitor with native species, but if established can have a moderate impact on native plant communities. Can reproduce vegetatively by stolon fragments. Germination is promoted by light. The early onset of low winter temperatures may postpone germination until the following autumn. Biotypes have evolved resistance to Group D/22 (Bipyridiliums) and Group L herbicides. Can go on to produce seed under defoliation. Persistence of seed in the soil is strongly influenced by the ecotype/location and degree of burial. Low rainfall events can favour capeweed germination before other species as the woolly seed cover attracts moisture and reduces desiccation. Seed dormancy is overcome by high summer temperatures. There may be large differences in seed dormancy characteristics, with genetically distinct populations adapted to particular environments.
Additional information. Origin. Southern Africa. History of use/introduction. Seed contaminant.
Suggested method of management and control. Chip out small infestations,ensuring root is severed well below ground level to prevent re-sprouting from the crown. For large infestations apply Lontrel® 6 ml/10 L (300 ml/ha) in early growth stages. Glyphosate at 0.2% will provide some selective control if the plants are young or at the budding stage, otherwise spot spraying glyphosate at 10 ml/L will control capeweed at all growth stages. A combination of chemical and physical control with follow up treatment provides optimal 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.
|Germination||O||Y||Y||O||O||O||O||Germinates after rains|
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.
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