Farmers are being urged to look out for the pest plant Chilean needle grass on their land by the Hawke's Bay Regional Council.
The Regional Council's biosecurity team leader, Alice McNatty, said the plant can be a real issue for landowners once it gets on their land.
"It has a sharp seed head that causes problems for stock as it can pierce an animal's eyes and skin," she said.
"The seeds spread easily on contaminated machinery, vehicles, feed and stock, so we're asking people to be vigilant and keep an eye out."
Ms McNatty said the plant's purple seed head made it easier to spot this month; later it turned a straw colour.