The Invasive Species Council [has nominated] Polygala myrtifolia (also known as myrtle-leaf milkwort, as one of Australia’s most significant weeds, even as potted examples continue to line shelves in retail stores.

This is just one of 32 invasive weeds of national significance which you can see here: https://www.abc.net.au/news/2025-03-15/australian-noxious-invasive-weeds-of-national-significance/105035444