Noxious Weeds Act 1993 No 11
71 How notice is to be given under this Act
(1) A notice under this Act is to be given in writing either personally or by post or in any other manner permitted by this section.(2) A notice under this Act concerning particular land may also be given:(a) by fixing a notice addressed to the occupier, either by name or as the occupier, on a conspicuous part of the land or any building or other structure on the land, or(b) if the address of the owner or occupier is unknown, publishing the notice in a newspaper circulating in the local area.(3) A notice served by post on a person for the purposes of this Act is to be treated as being properly addressed if it is addressed to the last known address of the person known to the person or body giving the notice.