These prickles are the worst thing about the Riverina. Cat's head or cat eyes, dunno what they're called but anyone who's walked barefoot, owns a pet or children, rides a bike or scooter would know what I'm typing about.
The secret to destroying them is to recognise their yellow flowers and green leaves, easy to spot during the beige colours of summer, and pull them out. It also helps if you put the remains in a bin so that any prickles don't travel further than the local landfill.
I've seen the greatest - "I've seen the greatest webs of my generation destroyed by a broom."