https://canberra.naturemapr.org/users/22862, I saw the flower buds of the tea tree recently when I checked CNG. Did you take a new photograph of the tea tree? I think there are still 2 around....
@Cuumbeun this is Yorkshire Fog (Holcus lanatus). It's also a common weed of damp sites. It has purplish spikelets and often a silvery blue colour to the leaves and stems.