Stinking Roger

Stinking Roger 3.

Common name

Stinking Roger

Scientific Name

Monoculus monstrosus previously named Osteospermum calandestinum

Type of plant

Daisies & Thistles (Family Asteraceae)

About this weed

This annual herb can be easily identified by its slightly sticky branches and leaves. It grows to about 0.5 m tall and the flowers are distinctive with a yellow edge and brown centre to each petal. As the name implies, this is a smelly plant when handled.


Stinking Roger is an erect annual producing yellow daisy flowers with red/brown centres. The seed germinates in late autumn and reproduction is by seed that is dispersed by wind, water and soil movement. The bract is slightly larger than the flower and encloses papery seeds.

Impact on Bushland

If left will spread over bushland and may impact on plant communities.


This weed is widespread across undulating sandplains, hills and slopes, valley slopes, creekbeds and saline watercourses. It prefers red-brown loams or sandy clays, yellow-white or grey-brown sandy loam, brown clay loam, limestone and granite outcrops across the South-West Province.

Priority for removal

Medium: if established can impact native plant communities.

Management (hand)

Hand remove small populations and/or isolated plants prior to flowering. Optimum treatment should be done between June and September and occasionally in October.

Management (herbicide)

Try spot spraying with glyphosate at 0.5% before flowering. Read the manufacturers’ labels and material safety data sheets before using herbicides. Optimum treatment should be done between July and September and occasionally in June and October.

Flowering month/s

October, November, December

Flower colour/s

Red, Yellow, Brown

Information source

Additional information

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.

Stinking Roger images


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Urban Bushland Council WA Inc

2 Delhi Street West Perth WA 6005

PO Box 326 West Perth WA 6872

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