Dune Onion Weed

Dune Onion Weed 2.

Common name

Dune Onion Weed

Scientific Name

Trachyandra divaricata

Type of plant

Bulbs or Corms

About this weed

This perennial herb is a native of South Africa and is now widespread on the Swan Coastal Plain especially in coastal heathland in white and grey sand. It is similar to Onion Weed Asphodelus fistulosus in appearance but has flat leaves and the flowering stalks is widely branched.

Description

A rhizomatous, perennial herb growing to 0.35 m high. The plant produces tall flowering stalks with small white flowers in spring. Wind dislodges and carries crowns of mature inflorescences acting as tumbleweeds, spreading numerous small seeds.

Impact on Bushland

A major weed of coastal dunes and is spreading inland. Fleshy leaves are able to spread over the sand surface and may be up to 1 m long,making older plants competitive for space. Has variable fruit set, affected by the age of plants and weather conditions. Has adaptions for dispersal by wind and water. Wind dislodges and carries crowns of mature infloresences acting as a tumbleweed, spreading numerous small seeds. Germination is inhibited by light, a response to blowing sand habitats where germination on the dry surface could prove detrimental. Poisonous to mammals.

Location

Usually found on white or grey sand on coastal dunes of the Swan Coastal Plain.

Priority for removal

High: is a major weed of coastal dunes but is spreading inland.

Management (hand)

Manually remove isolated or small infestations prior to flowering. Wipe with 50% Glyphosate solution before flowering. Optimum time for removal – any month.

Management (herbicide)

For dense infestations in degraded areas spot spray 0.4 g chlorosulfuron plus 25 ml wetting agent in 10 L of water when plants actively growing. Read the manufacturers’ labels and material safety data sheets before using herbicides. Optimal months for herbicide treatment are July, August and September.

Flowering month/s

August, September, October, November

Flower colour/s

White

Information source

https://florabase.dpaw.wa.gov.au/browse/profile/1368

Additional information

https://florabase.dpaw.wa.gov.au/weeds/swanweeds/

Hussey, B.M.J., Keighery, G.J., Dodd, J., Lloyd, S.G. and Cousens, R.D. (2007) Western weeds. A guide to the weeds of Western Australia, Second Edition, The Weeds Society of Western Australia, Victoria Park, Western Australia.

Dune Onion Weed images


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Location

Urban Bushland Council WA Inc

2 Delhi Street West Perth WA 6005

PO Box 326 West Perth WA 6872

(08) 9420 7207 (please leave a message)