What is a Noxious Weed?

Are those plants which have a detrimental effect or cause serious economic loss to agriculture or the environment.

Noxious weeds have been divided into four (4) categories according to action need for control, their extent and cost of control and weed  importance.

Categories of Weeds

Control class Weed type Example control requirements

Class 1

Plants that pose a potentially serious threat to primary production or the environment and are not present in the State or are present only to a limited extent.

The plant must be eradicated from the land and the land must be kept free of the plant. The weeds are also "notifiable" and a range of restrictions on their sale and movement exist.

Class 2

Plants that pose a potentially serious threat to primary production or the environment of a region to which the order applies and are not present in the region or are present only to a limited extent.

The plant must be eradicated from the land and the land must be kept free of the plant.
The weeds are also "notifiable" and a range of restrictions on their sale and movement exist.

Class 3

Plants that pose a potentially serious threat to primary production or the environment of a region to which the order applies, are not widely distributed in the area and are likely to spread in the area or to another area.

The plant must be fully and continuously suppressed and destroyed.*

Class 4

Plants that pose a potentially serious threat to primary production, the environment or human health, are widely distributed in an area to which the order applies and are likely to spread in the area or to another area.

The growth of the plant must be managed in a manner that reduces its numbers spread and incidence and continuously inhibits its reproduction*

Class 5

Plants that are likely, by their sale or the sale of their seeds or movement within the State or an area of the State, to spread in the State or outside the State.

There are no requirements to control existing plants of Class 5 weeds. However, the weeds are "notifiable" and a range of restrictions on their sale and movement exists.