Water caltrop
Trapa natans
See it - Report it
Early detection is vital to stop Water caltrop becoming established in South Australia.
If you see this weed, please report it to the National Pest Alert Hotline (Freecall) 1800 084 881.
Weed profile
Annual
Aquatic
Reportable
- Habitat: waterways, gardens
Impact
Forms dense mats over water. Spiny fruits. Not present in Australia.Description
- Annual aquatic herb, may be free-floating or anchored to mud.
- Rosette of fan-shaped leaves with toothed edges.
- Flowers white with 4 petals.
- Fruits hard nuts with four sharp spines.