Alligator weed
Alternanthera philoxeroides
Alligator weed
Other Common name: Pigweed
This pest is present in New Zealand.
Report any sightings to ph 0800 809 966
Synonyms
Telanthera philoxeroides
Description
This is a perennial aquatic or terrestrial herb with dark-green waxy leaves in opposite pairs. Stems are hollow and often reddish in colour. White clover-like flower clusters, 1-2 cm in diameter, appear during summer.
Impact
Alligator weed forms extensive floating mats. These outcompete other species and block waterways, causing silt accumulation, flooding and degradation of habitat for aquatic flora and fauna. Alligator weed is also invasive in terrestrial areas affecting crops and pasture. It is toxic to livestock.
What to do
Contact your regional council to determine the status of this species and responsibility for control and/or advice on control. This plant is widespread in Northland and Auckland, but rare or absent elsewhere.
Useful Resources
Page last updated: 20 March 2009