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Home > Our region and environment > Pest management > Pest plant help > Arrowhead (Sagittaria montevidensis)

Arrowhead (Sagittaria montevidensis)

Arrowhead (Sagittaria montevidensis) is an invasive aquatic weed that’s recently been detected in Bethlehem, Tauranga.

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Keep watch call it in

If you see arrowhead in the Bay of Plenty, please report it to us by calling 0800 STOP PESTS (0800 786 773) or emailing

Arrowhead grows in still or slow-moving waterways such as wetlands, drains and ponds. It has large glossy arrow-shaped leaves which grow up to 25cm long on stalks that stand up to 1 m above the water. Its white, three-petalled flowers have a purple blotch at the base and are visible between November and March. The flowers are about the size of a fifty cent coin

Arrowhead is an unwanted pest because of its potential to choke waterways, clog irrigation systems, aggravate flooding, displace native plants and animals and degrade fishing, swimming and other recreation opportunities. Arrowhead was first brought to New Zealand as a pond and aquarium plant. It has been previously found in parts of the Waikato but we’re aiming to prevent it from establishing in the Bay of Plenty.

See the Waikato Regional Council sagittaria factsheet for further information.