Europe and Asia
Puncturevine grows exclusively in southern BC, Osoyoos and Oliver, but has the potential to spread. Puncturevine is currently on CSISS’ regional EDRR watch list.
Puncturevine forms dense mats along roadsides, vacant lots, beaches and unpaved parking sites. Each plant can reach up to 3 metres in length and has hairy leaves and tiny yellow flowers. A few weeks after the yellow flowers bloom, spiny, sharp seedpods emerge. These sharp seedpods have a mild toxin at the tip and can easily cut skin and make humans and animals ill. The seeds spread easily by attaching to animals, humans and even tires.
Mechanical removal (digging, hand pulling, tilling) is effective against infestations when completed before flowering and seed production. Herbicides such as picloram, dicamba and glyphosate have been successful.
For information on prevention and control methods please refer to Weeds BC page 128