Under the Noxious Weeds Act, 1936, it is an offence not to prevent the spread of certain weeds, including ragworth and the owner, occupier, user or manager of lands on which these weeds are growing is liable, upon conviction, to be fined.
Over the years the problem of noxious weeds on farms has diminished due to intensive crop and animal production. Nowadays the main bulk of complaints relate to urban areas, particularly public sites and roadways and these are under the responsibility of urban and local authorities.