The ORC’s Environmental Data Portal is experiencing high traffic volumes affecting its effectiveness at present. The site is being worked on at present and people are asked to be patient. Please be considerate in using this tool, some people require access to the EDP for important decision-making today.
Environmental Data PortalThe ORC’s Environmental Data Portal is experiencing high traffic volumes affecting its effectiveness at present. The site is being worked on at present and people are asked to be patient. Please be considerate in using this tool, some people require access to the EDP for important decision-making today.
Common name: | Gorse |
Scientific name: | Ulex europeaus |
Management programme: | Sustained control |
Common name: | Broom (used for common and montpellier) |
Scientific name: | Cytisus scoparius (common), Teline monspessulana (Montpellier broom) |
Management programme: | Sustained control |
Gorse and broom were originally brought to New Zealand by settlers from Europe in the 1800s for use as hedge plants. Due to there being little competition, they soon spread from these original plantings and began invading the landscape.
Gorse and broom are pests as they produce massive numbers of long-lived seeds, mature and grow rapidly, and are able to establish in a range of habitats. These pests can form thick groups of bushes, outcompete native vegetation, prevent stock from grazing and are generally seen as a threat to economic and environmental values. They can tolerate a wide range of temperatures and rainfalls, and can withstand wind, salt, damage, grazing pressure, and can grow in most soil types.
Gorse and broom seeds are dispersed by explosive seed pods, water and human-mediated activity through contamination of vehicles, livestock and machinery. Seeds are long-lived and can remain dormant in the soil for 40-80 years.
Gorse and broom will grow well across habitat types anywhere in Otago. Thankfully, large areas of Central Otago and the Queenstown Lakes are mostly clear of infestations. Gorse and broom are only considered pests under our pest plan in the gorse and broom-free areas and rural-zoned properties.
Broom
Gorse
The goal of the pest plan is to sustainably control gorse and broom, to ensure that land that is free of, or that is being cleared, does not become infested. This is to prevent negative effects on both production and economic values.
To achieve this Otago Regional Council (ORC) slightly extended the gorse and broom-free areas from our last plan. These areas are mainly Otago’s unique high country and tussock grasslands that have never had a major history of these pest plants, and where an invasion of these plants would greatly affect grazing, biodiversity and the landscape. In total, the gorse and broom free areas cover over 50% of Otago.
Click here to see a map of the gorse and broom free areas in our pest plan
The rules in the Otago Regional Pest Management Plan (2019-2029) simplified include:
For a more detailed explanation of the programme and rules, see pages 48-52 of the Otago Regional Pest Management Plan (2019-2029).
Caution: When using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.
Disclaimer: Mention of product trade names does not endorse these products nor imply criticism of similar products not mentioned. The Otago Regional Council does not give any warranty that the information is accurate or complete or that it is suitable for all circumstances.
Biocontrol agents for both gorse and broom are present throughout Otago.
Otago Regional Council has carried out a number of releases of the broom gall mite across Otago with successful results for reducing broom infestations. Broom gall mite is a microscopic organism that colonises and feeds on broom, gradually forming white galls on the plants that can stunt their growth and eventually kill them. As its name suggests, the mite only attacks broom, making it an effective weapon against the invasive bush while protecting our native plants.
If you have gorse or broom, you can check for the presence of biocontrol agents (more detailed information is available on Landcareresearch.co.nz):
The sustained control programme aims to provide for ongoing control of the pest to reduce its impacts on values and spread to other properties.
Understand legal definitions ORC uses for terms like "Authorised Person", "Eliminate" and "Land occupier" and other terms we use in legislation.