Specific seeding season threat for Chilean Needle Grass

As seeding season begins, Marlborough District Council is urging landowners and the public to stay vigilant against Chilean Needle Grass (CNG) — a highly invasive pest plant threatening our region’s environment and economy.

First identified in Blind River in the 1940s, CNG now affects 2626 hectares across Marlborough, with nine new properties added last season alone. The plant’s sharp seeds pose serious risks to livestock, causing blindness in lambs and damaging pelts, meat, and wool.

Its ability to out-compete pasture grasses make it a formidable pest for farmers, especially in dry areas like South Marlborough.

Senior Biosecurity Officer, Hayden Nott says community awareness is the key: “CNG seeds are most visible from November to January and again in March to May. They attach easily to stock, vehicles, clothing, and machinery - making movement during seeding season a significant spread risk.

“Earthmoving equipment and contaminated hay are particularly dangerous, with seeds remaining viable in soil for over 12 years.

“We urge the public, contractors, and land occupiers to use the Marlborough District Council’s Biosecurity Smart Maps database to identify areas affected by Chilean Needle Grass before entering a property or undertaking specific work.”

Some farming and earthmoving activities are restricted on properties where CNG is present, which are explained on Council’s website. Under the Regional Pest Management Plan 2024, property occupiers are legally required to prevent the spread of CNG. Council offers support through management plans, inspections, and biosecurity signage. A rust fungus was introduced last October to help suppress the weed, with more releases planned.

If you suspect CNG on your property or want to learn more, contact Council’s Biosecurity team. Early detection and strict hygiene protocols are vital.
To find out more go to: www.marlborough.govt.nz/environment/biosecurity/a-z-of-pests/