Planted. The gardens and adjacent areas to the Nishi building have all been closely planted with natives, eg A. cognata, native Westringias etc. Some such as Rhagodia spinescens are not irrigated. I think Chorizandras may spread via rhizomes (not sure) so maybe they could become a problem.
OK, well I'm pretty sure it is Ficinia nodosa, not Chorizandra, which has more stem protruding beyond the inflorescence. I've compared it with photos I have of both. And Ficinia is a strictly coastal species. However, in an urban situation I can't see it becoming a problem (although with all wetland plants there is a chance that birds will spread the seed attached to feet or feathers). Someone else will need to confirm it, as I don't have moderator status on CNM.
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