It is listed as a plant prohibited for sale only. https://www.legislation.act.gov.au/View/di/2015-59/current/PDF/2015-59.PDF The City Services Lakes Ranger does control at some areas on the Lake when there is a threat to wetlands. An example is near the old Westbourne Woods. There use to be dense thickets there. If you come across thickets that are starting impact on native vegetation - definitely map the polygons Mike, on the Not-treated weeds ArcGIS Collector app map. This will bring its attention to the Lakes Ranger, and she can assess the priority in her works program. There was an old management plan for the Lake - that recommended removal of all the black alder - this would need initiative funding as it is a big job.
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We acknowledge the Traditional Owners of this land and acknowledge their continuing connection to their culture. We pay our respects to their Elders past and present.