Erect perennial or annual (occasionally), herb, 0.15-1.95 m high. Fl. pink-purple, Sep to Nov. Gardens.
Alternative Names. Glandular Willow Herb, Fringed Willow Herb.
General Biology. Growth form. Herb. Life form. Perennial. Reproduction. Primarily seed, also crown fragments. Dispersal. Wind, soil. Seedbank persistence. Short, possibly days - 1 year.
Notes. Common weed of nurseries and orchards. Prefers to establish on bare soil. Germinates rapidly in low light conditions, grows vigorously and produces large numbers of wind-dispersed seeds. Produces a rosette as an over wintering structure. Few herbicides provide effective control.
Additional information. Origin. Temperate Asia, Russia, Eastern Asia, North America. Similar native species. E. billardiereanum, E. hirtigerum.
Suggested method of management and control. Prevent plants going to seed. Hand remove small/isolated infestations of seedlings. If hand removing large plants ensure any crown fragments are removed as they may regrow left in the soil. Alternatively spray seedlings with glyphosate. Tolerant to glyphosate in later stages - established plants will resprout after treatment. Herbicides alone will not provide effective control - use a combination of good hygenie and herbicide management. 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.