Parkes Shire Council is reminding local landowners, farmers, and residents of the continued necessity to control the spread of Green Cestrum (Cestrum parqui), an extremely invasive and toxic plant recognised as a priority weed for the Shire.
Green Cestrum poses a significant risk to the health of humans, livestock, and the natural environment. The species contains a dangerous toxin that, if ingested, can cause severe liver and brain damage. All parts of the plant, especially the berries, are highly poisonous, and consumption can be fatal.
Michael Chambers, Manager of Environment and Sustainability at Parkes Shire Council, emphasised the potential dangers associated with this weed.
"Green Cestrum is a persistent biosecurity issue for Council and private landholders, especially livestock owners," said Mr. Chambers.
"This species can cause 'sudden death' in animals, including cattle, goats, and native animals. It's important for everyone to recognise the risks and take proactive steps to manage and control the spread of this toxic plant."
Green Cestrum, native to South America, was originally introduced to Australia as an ornamental garden plant and was particularly popular as a fragrant hedge plant. It has since become a widespread weed across Queensland, NSW, Victoria, and South Australia. The plant spreads primarily through bird-dispersed seeds and root suckering, and can rapidly form dense thickets, outcompeting native vegetation and reducing food and shelter for native wildlife. This, in turn, impacts local biodiversity.
In addition to its environmental impact, Green Cestrum poses a significant economic risk to farming communities. Infested pastures become dangerous for grazing, reducing livestock productivity and posing a deadly risk to animals.
Mr. Chambers urges landowners to take immediate action when they encounter Green Cestrum on their property.
"It's essential to treat mature plants before they flower, remove all plant material after treatment, and consistently monitor for regrowth and new seedlings," he said.
"Combining multiple control methods, such as herbicide treatments, mechanical removal, and mulching, will help to prevent the spread of this plant."
To help control Green Cestrum, Parkes Shire Council recommends several best practices. These include always wearing gloves when handling the plant, treating mature plants in early spring, and removing seedlings in autumn. Landowners should also remove all roots when pulling or digging out the plant to prevent regrowth. Additionally, any plant material that has been treated should be carefully managed, as it remains toxic until it fully disintegrates.
Under the NSW Biosecurity Act 2015, landholders are legally obligated to control Priority Weeds such as Green Cestrum. As the Local Control Authority, Parkes Shire Council actively inspects both public and private lands and implements targeted programmes to prevent the spread of these high-risk weeds. The Council's Biosecurity Team collaborates closely with landholders, community groups, and partner agencies like Local Land Services and Transport NSW to monitor and manage infestations.
