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.
10 Oct 2016
Parks Victoria is reminding the public new dog bans will apply in the Mornington Peninsula National Park from Tuesday 1 November 2016. In March 2016, the Minister for Environment and Climate Change announced dogs would be banned across the entire Mornington Peninsula National Park to provide greater protection for vulnerable…
9 Sep 2016 8:00pm - 29 Oct 2016 8:00am
Fun scary play based on the history of the Mansion. Follow the actors throughout the Mansion and the story unfolds as you move from room to room.
24 Sep 2016 8:00pm - 17 Dec 2016 8:30pm
Down to Earth is a theatrical production performed at the Werribee Park farm at night. Set in 1862 it combines the history of the farm with interactive comedy and scary elements. Suitable ages 10 and up. Dates available 24 sept, 14, 22 October, 4 November 9 and 17 December.
23 Oct 2016 10:00am-4:00pm
Wyndham City is once again proud to present the Children’s Week Picnic at Werribee Park on Sunday 23 October 2016. An annual Major Event for Wyndham and part of the State Government’s Children’s Week, the Children’s Week Picnic will be held for the 16 year in 2016 for a fun,…