A weed is any plant that colonises and persists in an ecosystem in which it did not previously exist. They may affect the economy, the environment, human health and amenity. Many plants introduced into Australia in the last 200 years are now weeds.
Plants that are weeds have a number of common characteristics. They usually produce large numbers of seeds. They are often excellent at surviving and reproducing in disturbed environments. They can usually thrive in a variety of conditions.
A weed can be an exotic species or a native species. Weeds can inhabit all environments; our cities, deserts, waterways, alpine areas and oceans.
Weeds invade bushland, particularly where there has been some disturbance to the natural processes in that environment, and can out compete native plants.
Throughout Australia, weeds are spreading faster than they can be controlled and management of them is consuming an enormous amount of resources. Some weeds are of particular concern and have been listed for priority management in legislation.
Not all of Australia’s weeds have come from other countries. Australian native plants can also become weeds. This usually occurs when species move into new areas where they have a competitive advantage over indigenous plants. An example of a native plant establishing itself outside its natural range is the Cootamundra Wattle Acacia baileyana.
Useful links for weed identification
Weeds in Australia, home page
https://www.environment.gov.au/biodiversity/invasive/weeds/
Weeds Australia, Weed ID page
https://www.environment.gov.au/biodiversity/invasive/weeds/identification/
Weeds of National Significance
https://weeds.ala.org.au/WoNS.html
New South Wales
NSW WeedWise
https://weeds.dpi.nsw.gov.au/
Sydney Weeds Committees
https://sydneyweeds.org.au/
Victoria
Agriculture Victoria
http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/weeds/a-z-of-weeds
Declared Noxious Weeds
http://agriculture.vic.gov.au/agriculture/pests-diseases-and-weeds/protecting-victoria/legislation-policy-and-permits/declared-noxious-weeds-and-pest-animals-in-victoria
Queensland
Weeds of Australia identification tool
https://www.business.qld.gov.au/industries/farms-fishing-forestry/agriculture/land-management/health-pests-weeds-diseases/weeds-diseases/identification
Weeds of SE Qld and Northern NSW Lucid mobile app
https://identic.com.au/blog/weeds-of-se-qld-and-northern-nsw-lucid-mobile-app/
Brisbane City Council Weed Identification tool
https://weeds.brisbane.qld.gov.au/
Weed Management
Early Invader Weeds
https://www.environment.vic.gov.au/invasive-plants-and-animals/early-invaders
Weed Management Guides
https://www.aabr.org.au/learn/professional-practice/management-guides/
NSW DPI Weed Management Guides
https://www.dpi.nsw.gov.au/biosecurity/weeds/weed-control/general-management/weeds-crc-pubs/wmg
NSW Weed Control Handbook
https://www.dpi.nsw.gov.au/biosecurity/weeds/weed-control/management-guides/noxious-enviro-weed-control
Invasive Species Council: A whitelist approach
https://invasives.org.au/publications/stopping-weed-invasions-white-list-approach/
Regulatory Requirements for Chemical Use
Pesticide Use in NSW : legislation, training, re-training, record keeping and minor-use permits
https://www.epa.nsw.gov.au/your-environment/pesticides
Pesticide Use in Victoria : A guide to using agricultural chemical in Victoria : legislation, training, licences, notification, record keeping
http://agriculture.vic.gov.au/agriculture/farm-management/chemical-use-old/publications/a-guide-to-using-agricultural-chemicals-in-victoria
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