Erect annual or biennial, herb, 0.2-1 m high. Fl. yellow, Mar to Jul or Sep to Nov. Sandy soils. Roadsides, sand dunes.
Alternative Names. Fragrant Evening-primrose, Sweet Sundrop.
General Biology. Growth form. Herb. Life form. Perennial. Reproduction. Seed. Dispersal. Wind, soil movement.
Notes. Widely naturalised. Flowers are generally only fully open in low light conditions (early morning, evening and on cloudy days). Germination rates are higher under particular light conditions, that occur when some form of disturbance clears overlying vegetation or buried seed is unearthed. Produces numerous fine seed. Adapted to coastal climates and conditions.
Additional information. Origin. Southern Chile and Argentina. Similar exotic species. Oenothera drummondii.
Suggested method of management and control. Control in seedling stage, as older plants are resistant to herbicide. Relatively tolerant of glyphosate. Hand remove small populations, ensuring removal of entire root stystem. Spot spray chlorsulfuron 0.4 g/10 L + spray oil. 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.
|Flowering||Y||Y||Y||Y||Y||Y||Y||Y||Y||Y||Y||O||Can flower throughout the year|
Legend: Y = Yes, regularly, O = Occasionally, U = Uncertain, referred by others but not confirmed.