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. A comprehensive list of weeds is available on the Department of Environment and Primary Industries website.
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.
18 Aug 2015
Visitors to the Grampians National Park will be able to enjoy a stunning new experience of a favourite walk, after track upgrades at the Grand Canyon. The Grand Canyon will be closed for works from Monday 3 August with the upgrade expected to be completed, depending on weather and construction…
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.
6 Sep 2015 7:00am-11:00am
Celebrate dads everywhere and raise vital funds to support men’s health and the important role fathers play in the lives of Australian children. This is a fun, family-friendly event open to all ages and abilities, with two cycling events to choose from: The Mattioli Challenge – 7.00am The Family Bike…
12 Sep 2015 - 13 Sep 2015
Race against the clock DOWN everyone’s favourite track 13! This is NOT a downhill specific race, more a timed run down the track. Everyone is encouraged to enter. Doesn’t matter what type of bike you have, AM, XC, DH, HT, BMX or even a unicycle, they all go down hills…
19 Sep 2015 9:30am - 20 Sep 2015 5:00pm
The event features an extensive display of local wildflowers, with twice daily bus tours, (bookings essential), and a major photographic competition in the categories of local landscapes, flora and fauna. Other features for the weekend will include static displays and digital presentations from the Friends Group, the Inglewood Eucalyptus Museum,…