Riparian Weed Control Program
One of the most extensive vine weed management projects undertaken in South East Queensland.
Managing invasive weed species to preserve water quality and improve the condition of riverbanks.
With funding and guidance provided by Seqwater, Healthy Land & Water has teamed up with local restoration contractors to contribute towards managing Cat’s Claw and Madeira vine along 250km of riverbank within South East Queensland.
Where physical removal of the weeds has not been possible, biological control agents have been released into infestation to help stem the growth and spread of invasive vine weeds. The biological control agents are approved for release within Australia and sourced from from breeding facilities run by community groups.
Farmers community groups and local governments councils are working together to help protect and improve the condition of the region’s waterways for future generations.
The project focuses on:
- Managing invasive weed species to preserve waterway health in waterways that provide cities and towns with drinking water.
- This also protects biodiversity and provides habitat.
- Keeps waterways stable - preventing sediment from entering Moreton Bay.
This project is an important part of Seqwater’s vision for Water for Life and Healthy Land & Water’s broader efforts towards a concerted war on weeds across South East Queensland, which has been actively rolling out on-ground works for more than 20 years.
Managing invasive weed species to preserve water quality, improve the condition of the region’s riverbanks to protect biodiversity, and provide habitat.
What we are doing
Cats Claw creeper invading native vegetation
The Seqwater program manages invasive weed species like Cat’s Claw Creeper, Madeira vine, and Chinese elm in targeted locations across the region that have been identified by Seqwater as critical to maintaining water quality.
The process involves:
- Primary weed control. This involves physically cutting the vines off the vegetation, both at ground level and chest height. The stumps at ground level are scraped and painted with herbicide to kill the underground tubers. The cut vines between the ground and chest height are removed to allow visibility of new vines climbing trees.
- Maintenance weed control. Vines from resprouting tubers and newly germinated seeds are sprayed with herbicide to prevent reinfestation. This has to be undertaken 4-6 times per year to prevent the vines from reaching the tree canopy. After approximately five years of control, the supply tubers are typically exhausted and maintenance requirements become less onerous. Ongoing monitoring and maintenance will likely always be required to prevent reinfestation from seed sources.
- Where manual control is not possible due to lack of access, cost, or weed extent biological control agents are released.
- For Cat’s Claw Creeper the agent of choice is Jewel Beetle, native to South America and raised in purpose-built facilities run by community groups. The beetle attacks the weed in two ways. Adult beetles feed on the growth tips of the plant and the larvae feast on the internal structure of the leaf once they emerge from the egg. This insect activity given time, weakens the plant, reducing seed set and allowing other pathogens to take hold and reduce the weed’s vigour.
Measuring success
We measure success with the length of riparian area under active management for Cat’s Claw. As the scale of the project increases, the logistics of scheduling regular maintenance rotations to prevent reinfestation by Cat’s Claw become increasingly complex. The year 2023-2024 included 148 kilometres of riparian area under management, which aimed to steadily increase in 2025.
Over 200,000 jewel beetles have been released through the program at multiple locations throughout South East Queensland. While biological control agents will never destroy the host plant entirely, their presence reduces the impact of the weed, giving the native vegetation a chance to recover.
Control of these weeds protects existing native riparian vegetation, which provides the ecological service of long-term, sustainable delivery of clean water.
Why this project is important
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The presence of foreign weeds is rapidly destroying South East Queensland’s precious ecosystems. These invasive weeds continue to thrive in our environment due to the lack of natural predators and their ability to outcompete native flora for resources such as space, nutrients, and water. Infestations of invasive vine species along riverbanks and in rainforests have devastating effects on our region as they can overgrow and kill mature canopy trees, resulting in streambank erosion. The Regional Riparian Weed program helps to reduce these degrading processes by protecting the natural environment and ensuring our rivers and streams remain healthy with adequate water quality and habitat species. |
Project snapshot
| Project name: | Riparian Weed Control Program |
| Project manager: | Leonard Ainsworth, Healthy Land & Water |
| Catchment: | South East Queensland |
| Timing: | 2016 - current |
| Budget: | $12 million over 10 years |
| Partnerships: | This weed control program is made possible through funding from Seqwater and co-investment from Moreton Bay Regional Council who share the objective of preventing sediment from entering Moreton Bay and to preserve water quality in water catchments that provide supply drinking water. |
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What's next
Healthy Land and Water signed a new 5 year agreement in 2023/24 to continue this successful work. There is huge potential to build on this through collaboration with land managers and other stakeholders to coordinate delivery and coinvest to expand the area of waterways where these invasive weeds are being controlled.
Project collaborators
This weed control program is made possible through funding from Seqwater and co-investment from Moreton Bay Regional Council who share the objective of preventing sediment from entering Moreton Bay and to preserve water quality in water catchments that provide supply drinking water.
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