Spotted knapweed (Centaurea stoebe subsp. micranthos)

PROHIBITED MATTER: If you see this plant report it. Call the NSW Invasive Plants & Animals Enquiry Line 1800 680 244

Knapweeds are members of the thistle family, but they have no spines on their leaves.


How does this weed affect you?

Knapweeds are not readily eaten by livestock and compete with useful pastures, possibly with alleleopathic effects (whereby they produce chemicals to suppress the growth of other plants) that reduce the carrying capacity of the land.

Where is it found?

Only one infestation of spotted knapweed has been known to occur in Australia in the ACT, which is now controlled.

Distribution map

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Herbicide options

Users of agricultural or veterinary chemical products must always read the label and any permit, before using the product, and strictly comply with the directions on the label and the conditions of any permit. Users are not absolved from compliance with the directions on the label or the conditions of the permit by reason of any statement made or not made in this information. To view permits or product labels go to the Australian Pesticides and Veterinary Medicines Authority website

See Using herbicides for more information.

Glyphosate 360 g/L (Roundup®)
Rate: 10 mL per 1 L water
Comments: Spot spray
Withholding period: Nil.
Herbicide group: M, Inhibitors of EPSP synthase
Resistance risk: Moderate

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Biosecurity duty

The content provided here is for information purposes only and is taken from the Biosecurity Act 2015 and its subordinate legislation, and the Regional Strategic Weed Management Plans (published by each Local Land Services region in NSW). It describes the state and regional priorities for weeds in New South Wales, Australia.

Area Duty
All of NSW General Biosecurity Duty
All plants are regulated with a general biosecurity duty to prevent, eliminate or minimise any biosecurity risk they may pose. Any person who deals with any plant, who knows (or ought to know) of any biosecurity risk, has a duty to ensure the risk is prevented, eliminated or minimised, so far as is reasonably practicable.
All of NSW Prohibited Matter
A person who deals with prohibited matter or a carrier of prohibited matter is guilty of an offence. A person who becomes aware of or suspects the presence of prohibited matter must immediately notify the Department of Primary Industries

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For technical advice and assistance with identification please contact your local council weeds officer.
For further information call the NSW Invasive Plants and Animals Enquiry Line on 1800 680 244 or send an email to

Reviewed 2018