Madagascar ragwort has the potential to become a significant problem for pastoral farmers in New Zealand. Farmers are encouraged to learn what it looks like and act quickly if found.
Last updated: August 2026
Why it’s an issue
Madagascar ragwort is an aggressive weed that can take over pastures, reducing productivity, and is difficult to control.
It’s toxic to livestock, especially cattle and horses, and once established it can cover up to 80 percent of a paddock. Infestations can go from a few plants to a major problem in just two years.
Madagascar ragwort has been a particular issue in Northland, where it’s now spreading fast and causing serious problems for farmers.
What farmers can do
- Particularly in areas where Madagascar ragwort has been confirmed, learn what it looks like.
- Check paddocks regularly.
- Report any sightings to your regional council.
- Familiarise yourself with your regional council’s latest advice on dealing with this weed. Early detection and action are critical.
Further information
Check out information provided by regional councils in areas where Madagascar ragwort has been confirmed.