These are plants which threaten environmental values or seriously undermine the economic potential of production land.

Many of the plants now considered environmental pest plants were imported as ornamental garden plants for their colour, scent, or beauty. These plants have escaped into the wild, and in favourable conditions they grow and spread rapidly.

Our Region’s biodiversity (native habitat) is threatened by pest plants which can choke lakes, degrade wetlands, collapse forest canopies, smother regeneration in natural areas, and invade alpine and tussockland.

With over 300 pest plant species in our region, controlling these pests is a huge job.

Under the Biosecurity Act Horizons produces and implements a Regional Pest Plant Management Strategy.

Our aim under the strategy is to prevent new incursions of pest plants and manage the impacts of those pest plants already established.

The strategy is a comprehensive document that considers the impact of each pest plant species, the degree of threat it poses, its distribution and density and our ability to control it. It also determines how, or if, we will manage it.

Control of pest plants must be of concern to everyone if the rich natural diversity of plant and animal life is to be preserved for future generations. Some regulatory measures are specified in our strategy for some species, but these do not exclude anyone from taking the initiative in helping to keep any pest plants under control.

Want more information?

View the Regional Pest Plant Mangement Strategy (RPPMS) Operational Plan for 2011-12.  If you would like advice on controlling specific pest plants please see our A-Z of pest plants, or contact us.