Posted: 25/05/2015 at 16:55
Hello angloaussie and welcome.
I don"t recognise this plant/weed.
However, if it is "taking over" then treat it as a weed.
is it easy to dig up? Does it flower? If its easy to dig up then do that. Just make sure all the roots have been removed too.
hopefully my reply will bump this up for someone to identify for you. (Was an aussie in my childhood days )