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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Legal requirements

The content provided here is for information purposes only and is taken from the Noxious Weeds Act 1993.

Area Class Legal requirements
All of NSW 5 Restricted Plant
The requirements in the Noxious Weeds Act 1993 for a notifiable weed must be complied with

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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 2014