Invasive weeds are a serious threat to biodiversity in Victoria both on land and in aquatic environments.
Weeds compete with native plants for space, nutrients and sunlight. They change the natural diversity and balance of ecological communities. Weeds also affect the function native species have in providing nutrients and habitat for other species.
Weeds that have been introduced into the Australian environment have no natural controls from insects, grazing animals or fungi that feed on them to limit their spread.
There are over 1000 species of weeds occurring on public land in Victoria.
More about weeds
- Weeds often reproduce in a way that allows them to spread over large distances. For example, willows have winged seeds that are carried on the wind tens of kilometers from their source
- Woody weeds, such as blackberry and gorse, shade out native plants and create impenetrable thickets
- Scrambling weeds such as Bridal Creeper, smother native plants and create dense root mats that prevent other plants from accessing adequate moisture and nutrients
- Some exotic grasses out-compete native grasses and can create high fuel loads that can cause greater bushfire intensity
- Some weeds, like the Hawkweed, can produce biochemicals that inhibit the growth of other plants around them
Marine weeds can release large amounts of spores allowing them to reproduce quickly.
Parks Victoria works with the Department of Environment and Primary Industries, other land managers, land owners and community groups to manage weeds in parks.
The four objectives for weed management are to:
- Prevent their spread by making sure equipment and vehicles are clean of seeds and spores
- Eradicate small infestations that are unlikely to have spread beyond a definable boundary
- Contain infestations where they can be prevented from expanding beyond a defined containment line
- Protect assets (e.g. native plants and animals, neighbouring agricultural land) from the impacts of invasive weeds by reducing population densities.
Weed infestations are controlled mainly through the use of chemical sprays. However, in fragile environments such as the alpine peatlands and marine environments, weeds may be pulled manually by hand.
Biological control is another way weeds are controlled. This is when one living species (such as a plant, fungi or insect) is introduced to control an unwanted species. Biological control may be used when weeds are too widespread for chemicals to be used.
09 Jun 2016
Point Nepean National Park, Cape Schanck Lighthouse Reserve and Coolart Wetlands and Historic Homestead are back again hosting winter holiday fun for kids. Parks Victoria’s FREE Junior Ranger program shares the hidden mysteries of our special places, as kids enjoy energetic experiences connecting them with the Mornington Peninsula environment and…
1 Jul 2015 12:00am - 30 Jun 2016 12:00am
A wide variety of events are held at Albert Park throughout the year. Events range from fun runs and sporting tournaments to other community events. See the full calendar here.
28 Jun 2016 9:30am-11:00am
Ever wondered why the Kangaroos at the Prom wear collars and ear tags? Join a ranger to learn about the latest research on Eastern Grey Kangaroos.
28 Jun 2016 10:00am-11:30am
A rare opportunity to visit spectacular caves located to the north of Buchan. Be prepared for something very special. The tour requires a 14km drive north of Buchan and a reasonable level of fitness. Discounts apply for multiple tours.
28 Jun 2016 3:00pm-4:00pm
This historical tour provides a unique opportunity to view a cave that is rarely open to the public and is part of the same cave system as the Royal and the Fairy show caves. Lit only by solar-powered pathway lights, you are provided with a helmet and headlight to view…