Each catchment management area in Victoria classifies weed species in a hierarchy of increasing importance. These classifications are designed to give new and emergent weeds a higher priority in each CMA to stop these species from becoming established and therefore not eradicable. The list of species and their classifications are determined through a state wide list of designated noxious plants with the classification of weed species recommended through the local catchment management authority level except for species of state importance (see state prohibited weeds). Species are classified depending on their invasiveness potential, distribution and environmental and economic impact.
In the state of Victoria, declared noxious plants are grouped into one of four classifications.
- State Prohibited Weeds
These weeds either do not occur in Victoria, but pose a significant threat if they invade, or are present, pose a serious threat and can reasonably be expected to be eradicated.
- Regionally Prohibited Weeds
Regionally Prohibited weeds are not widely distributed in a Region but are capable of spreading further. It is reasonable to expect that they can be eradicated from a Region and they must be managed with that goal.
- Regionally Controlled Weeds
These weeds are usually widespread and are considered important in a particular Region. To prevent their spread, continuing control measures are required. Land owners have the responsibility to take all reasonable steps to prevent the growth and spread of Regionally Controlled weeds on their land.
- Restricted Weeds
This category includes plants that pose an unacceptable risk of spreading in this State or to other parts of Australia if they were to be sold or traded in Victoria, and are a serious threat to another State or Territory of Australia. Trade in these weeds and their propagules, either as plants, seeds or contaminants in other materials is prohibited
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