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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Legal requirements

The content provided here is for information purposes only and is taken from the Noxious Weeds (Weed Control) Order 2014 published in the NSW Government Gazette, detailing weeds declared noxious in New South Wales, Australia, under the Noxious Weeds Act 1993. The Order lists the weed names, the control class and the control requirements for each species declared in a Local Control Authority area.

Area Class Legal requirements
Lord Howe Island 3 Regionally Controlled Weed
The plant must be fully and continuously suppressed and destroyed

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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