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.
06 Mar 2014
Clean Up Australia Day events held at Kalimna Park and Golden Point Reserve over the weekend resulted in 4 cubic metres of rubbish being removed from the bush in and around the Castlemaine Diggings National Heritage Park. Active community members of Castlemaine and Chewton spent their Sunday collecting rubbish including…
12 Mar 2014
The Grey-headed Flying-fox is the largest flying-fox (also known as a fruit bat) species in Australia. Each month the Australian Research Centre for Urban Ecology conduct the monthly bat count at Yarra Bend Park at dusk on the Wednesday evening closest to the risen full moon. This data is critical…
15 Mar 2014 9:00am - 16 Mar 2014 5:00pm
The Back to Steiglitz community art group will have an exhibition in St Paul's church, Steiglitz. There will be 4 artists displaying their works in a variety of mediums and styles. Historic buildings will be open to the public. The Back to Steiglitz group will provide food and drinks for…
23 Mar 2014 9:00am-3:00pm
Help create koala habitat and learn about koalas. Enjoy a day helping Koalas in the wild. Search for koalas, monitor their behaviour, remove weeds from their habitat and take records of all other wildlife seen, all in the company of a highly experienced Koala Researcher. Part of the day is…
23 Mar 2014 11:00am-3:30pm
Live.Grow.Explore. Community Day brings community together to explore their broader backyard and to learn more about sustainable lifestyle choices in one of Melbourne's most extensive landcare and reinvigoration corridors. This FREE family event and BBQ lunch showcases many sustainable education stalls. The day includes Vasili Kanidiadis of Vasilis Garden to…
Happy International Women’s Day! Photo: Ranger Deb Cross at the Gil Groggin Fir...Happy International Women’s Day! Photo: Ranger Deb Cross at the Gil Groggin Fire north of Buchan.View post | Sat, 08 Mar 2014 09.42
The Mt Zero area in Grampians National Park has re-opened in time for the long w...The Mt Zero area in Grampians National Park has re-opened in time for the long weekend to provide visitors with a walking experience in the Northern Grampians. Many areas in the park are now open after the fire in January. Full details here http://ow.ly/ukBMTView post | Fri, 07 Mar 2014 17.11
Thanks to all our Facebook friends who have sent in their favourite park photos...Thanks to all our Facebook friends who have sent in their favourite park photos this week to help inspire your next park visit. Enjoy your local parks and beyond this long weekend to help celebrate the end of Parks Week.Friends Parks Week photosThanks to all our Facebook friends who have sent in their favourite park photos this week to help inspire your next park visit. Enjoy your local parks and beyond this long weekend to help celebrate the end of Parks Week.View post | Fri, 07 Mar 2014 13.45
Introducing the newest recruit to join the Werribee Park horticultural team, See...Introducing the newest recruit to join the Werribee Park horticultural team, See Me. He is from the Karen people of Burma and lived for 15 years in a refugee camp before coming to Australia. See Me is being sponsored by Matchworks and will be working with us for the next 11 months while he completes a Certificate Three in Horticulture. We’re celebrating the many park connections with Victoria’s rich multicultural community during Parks Week. http://ow.ly/ui2jQView post | Thu, 06 Mar 2014 16.14
Clean Up Australia Day events at Kalimna Park and Golden Point Reserve last week...Clean Up Australia Day events at Kalimna Park and Golden Point Reserve last weekend resulted in 4 cubic metres of rubbish being removed from the bush in and around Castlemaine Diggings National Heritage Park. We would like to say a big thank you to all the volunteers for their efforts on the day. http://ow.ly/uhMnvView post | Thu, 06 Mar 2014 11.43