Mexican poppy (Argemone mexicana)



Mexican poppy is an erect annual herb growing to one metre high, with spiky leaves, bright yellow flowers and globular seed heads. It is poisonous to stock and humans, but is rarely eaten by stock due to its unpalatable bitter yellow sap; however contamination of stock feed with seeds of Mexican poppy may result in poisoning. Seeds can be spread in water, mud, fodder and grain, and on machinery.

Mexican poppy is native to Mexico.

Mexican poppy may be confused with two related species - Argemone ochruleuca, and Argemone subfusiformis, both also commonly called Mexican poppy. Argemone ochruleuca has creamy white to pale yellow flowers and Argemone subfusiformis has flowers similar to Argemone mexicana but with broader petals (2.8-3.3 centimetres wide compared to 1.7-2.5 centimetres wide for Argemone mexicana).

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Herbicide options

Contact your local council weeds officer for control advice for Mexican poppy (Argemone mexicana).

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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.

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Reviewed 2014