Once widely planted for its golden blooms and quick growth, the Cootamundra wattle has become an unwelcome guest in many parts of Australia. Native to a small area of NSW, it has expanded far beyond its natural range. Now declared a weed in the ACT, dense patches are found throughout many reserves and parks around Canberra.
Fast-growing and widespread, Cootamundra wattle threatens local biodiversity by outcompeting local native species and altering landscape structure. At Mount Rogers Reserve—an Urban Open Space surrounded by the suburbs of Flynn, Fraser, Spence, and Melba—the Mount Rogers Landcare Group has been working hard to reclaim the bush from the Cootamundra. Volunteers have focused on manually removing seedlings and cutting saplings at the base, while larger trees are being professionally removed with assistance from the ACT Government.
Looking ahead, the group is exploring the use of herbicides to improve control and hopes to continue collaborating with the ACT Government in a long-term, integrated management approach.
How does this affect us?
Nature reserves and green spaces across the ACT are important not just for native wildlife, but also for the people who use them. Whether walking the dog, going for a jog, or enjoying some fresh air, access to healthy natural areas supports our physical and mental wellbeing.
However, invasive species like the Cootamundra wattle can degrade these spaces, reducing their ecological value and usability. The efforts of groups like Mount Rogers Landcare Group help preserve and restore these areas—benefiting both biodiversity and community wellbeing for generations to come.
What is this native species gone rogue?
Species profile: Cootamundra wattle
Scientific name: Acacia baileyana
Description: Shrub or small tree with silvery grey-green/blue-green bipinnate leaves (feathery) and golden spherical flowers. It is fast-growing, reaching sexual maturity at 2–4 years and living for over 20 years.
Reproduction: Seeds are dispersed by birds, ants, gravity and wind. They can remain dormant in the soil for over a decade, with germination often triggered by fire or disturbance. Flowers appear from June to September for a few weeks at a time, and seed pods mature from October to January.
Impact: Originally from a small region in NSW, it has become an environmental weed across much of Australia. It typically invades forests and woodlands in drier areas with more than 400mm of annual rainfall. Cootamundra wattle competes with native groundcovers, shrubs, and trees, and is known to hybridise with at least six other native wattle species.
Threatened ecosystems include:
- Heathland and heathy woodland
- Riparian vegetation
- Lowland grassland and grassy woodland
- Dry sclerophyll forest and woodland
How do we manage it?
Cootamundra wattle management requires a case-by-case approach. Weed control in bushland differs significantly from garden weed removal.
“Weeding in the bush needs to be done with a focus on improving the natural biodiversity of the area rather than eradicating every weed on site.” (ACT Weeds Manual)
This biodiversity-focused method considers the habitat needs of local wildlife and prioritises ecological outcomes. In some cases, it may mean temporarily retaining Cootamundra wattles while native plants are re-established. In others, like at Mount Rogers Reserve, dense post-fire germination has necessitated large-scale removal.
Long-term control depends on removing large seed-producing trees and persistently targeting new seedlings before they mature. As Cootamundra wattle seeds remain viable for over 10 years, this is not a one-off task but an ongoing process involving both manual removal and careful herbicide use.
While it can be an intimidating challenge, it is important to remember weed management is a shared responsibility.
“Weed management is a shared responsibility, involving people and organisations from the local to the national scale.” (Australian Government’s Australian Weeds Strategy 2017-2027)
Managing Cootamundra wattle at Mount Rogers Reserve
Prepared by Mount Rogers Landcare Group
Cootamundra wattle (Acacia baileyana) is widespread on Mount Rogers and is a very serious threat to the native ecosystem. This wattle is typically observed in patches; most noticeably in areas which have been subject to historical burns where heat has triggered germination of a previously established seed bank.
Perhaps, the best example of this phenomenon can be seen in the north-west region, after walking one hundred metres or so, along the main outer loop track, in an anti-clockwise direction from the Wickens Place car park. Here you will see a dense thicket of Cootamundra wattles, just in from the track (see image below). These wattles sprang to life from the seed bank following a localised fire. The fast-growing wattles have smothered this area and have outcompeted slower growing, native species.
Image: North-western thicket of Cootamundra wattle at Mount Rogers Reserve. Photo courtesy of the Mount Rogers Landcare Group.
Mount Rogers Landcare Group consists of a small number of volunteers who do not have the capacity to remove large Cootamundra wattles, so efforts go into manual removal of smaller specimens which are pulled where possible or cut at ground level using a handsaw or a large ratchet lopper. The lopper was acquired and funded through the ACT Governments Adopt-A-Park project.
Noteworthy points:
- More high-level support and resourcing in the early stages of Cootamundra wattle removal on Mount Rogers may have helped to limit the scale of the current challenge.
- Cootamundra wattle is prolific and is arguably on par with other highly invasive species in the ACT such as African lovegrass and St John’s wort.
- Mount Rogers Landcare Group members have invested considerable time and effort in pulling up many thousands of seedlings and cutting smaller specimens at the base. Recent observations of regrowth on some larger cut stumps suggests an application of glyphosate should be used on these when cutting.
- Mount Rogers Landcare Group are reliant on the professional cutting and removal (off-site) of large Cootamundra wattles. This action also serves to address the fuel loading compliance as determined by the ACT Government.
Key takeaways
The story of Cootamundra wattle at Mount Rogers Reserve shows how persistent invasive species can be—and the long-term commitment needed to control them. With a long-lived seedbank and rapid regeneration after disturbance, effective management demands a strategic, sustained approach.
The work of Mount Rogers Landcare Group highlights the value of early intervention, dedicated community action, and thoughtful, site-specific management. It also demonstrated that government support—through resourcing, collaboration, and professional assistance—is vital for achieving meaningful, long-term outcomes.
While the challenge is ongoing, the efforts of Mount Rogers Landcare Group shows that local commitment can make a real difference in restoring and protecting our bushland for future generations.
… So what can you do?
If you’re interested in supporting this work or learning more about weed management in your area, consider:
- Joining your local Landcare group or inviting friends along
- Visiting Mount Rogers to see their work first hand (see map)
- Reaching out to Mount Rogers Landcare Group via communications@ginninderralandcare.org.au
- Checking out the resources below for more information.
Further resources
- ACT Weeds Manual (pdf)
- Article [Paywalled] : John Dwyer (2022) Cootamundra Wattle, Australian Garden History, Vol. 34, No. 2, Oct 2022, 23-25.
References
- Ian Bushnell (2020) Call for more attention to streetscapes and green spaces post-COVID-19, Region Canberra.
- Weeds Australia (2019) Cootamundra wattle, Centre for Invasive Species Solutions.
- Landcare ACT Weeds Working Group (2023) Recommendations on the Management of Weeds in the Australian Capital Territory (pdf), Landcare ACT.
- Invasive Plants and Animals Committee (2017) Australian Weeds Strategy 2017–2027 (pdf), Commonwealth of Australia.