Winter senna (Senna septemtrionalis)

Also known as: arsenic bush



Winter senna has escaped cultivation as a garden plant. It is regarded as an environmental weed in NSW and Qld. 


Winter senna or arsenic bush, native to Mexico, is a shrub 1-3 m high. Its flowers are yellow and pods are 7-8 cm long. 


Frequently found in warmer coastal districts in moist or disturbed forest and along roadsides.


Richardson F.J.,Richardson R.G. and Shepherd R.C.H (2006).Weeds of the south-east an identification guide for Australia. (R.G. and F.J. Richardson, Melbourne).

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Herbicide options

Contact your local council weeds officer for control advice for Winter senna (Senna septemtrionalis).

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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