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.
01 Feb 2016
This summer, why not visit one of the fantastic regional parks throughout Hepburn, Ballarat, and Pyrenees Shires, and say hello to new Parks Victoria ranger Samantha? Sami is based in Creswick and is looking after parks in Ballarat, Creswick, Hepburn and Beaufort. “It’s fantastic to be able to use my…
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 Feb 2016 10:00am-3:00pm
You are invited to have your say about planning the park’s future and provide feedback on a Discussion Paper which re‐looks at the 2010 draft master plan. Please drop in on the Friday or Saturday to speak with a member of the team involved in renewing the master plan. The…
14 Feb 2016 10:00am-3:00pm
Workshops on companion planting, free grafting demonstrations will be happening all day - no booking required and the local CWA are coming on board to provide food and refreshments. Rotary members will be directing traffic via Gate 5 so you won't have so far to walk with your new trees.…
19 Feb 2016 - 28 Feb 2016
Sly Rat Theatre Co. in conjunction with The Living Museum of the West and Maribyrnong Council presents William Shakespeare’s A Midsummer Night's Dream. Sly Rat Theatre Co. is excited to announce that its first production for 2016 is Shakespeare’s most popular comedy, A Midsummer Night's Dream! In association with The…