Caltrop (Tribulus terrestris) is a flat, sprawling, annual herb with numerous green to reddish brown stems radiating from a crown. It is also known as Three Cornered Jack or Bindii. Each Caltrop plant can have hundreds of extremely sharp woody seed capsules, which can penetrate through tough barriers. Caltrop seed germinates from late spring and through the warmer summer period. New plants grow whenever we get significant rainfalls and it can take many years to control Caltrop as seeds can remain viable for up to 10 years.
Depending on the maturity of the plant, we will treat Caltrop on public land with herbicide or manually remove and dispose of by deep burial at a registered landfill. If you see any Caltrop weeds, please report to us.
Report Caltrop weeds
For more information on Caltrop please refer to the Natural Resources Adelaide and Mt Lofty Ranges fact sheet.