Thanks Marck.
Some quick Googling suggested this is a weed in Australia, however upon closer reading this one in particular isn't.
"Considerations - Asparagus aethiopicus includes variants that are popular ornamentals, particularly in hanging baskets. It was formerly confused with Asparagus densiflorus in gardening literature. The cultivar Asparagus aethiopicus ‘Myersii’, known as foxtail asparagus or foxtail fern, is explicitly exempt from declaration. Unlike the trailing parent species, it has compact erect shoots and low seed production."