Yes, indeed. That is part of the reason I put it up. I have a suspicion that when the Hall bypass was done, plantings on the verge contained some of those... They certainly are on the other side of the fence. We will have to keep an eye on them - and eventually get rid of them. These look a bit weedy in that spot.
Yeah, plenty of non-local wattles and other natives are spreading a fair bit along the Federal Highway on the sides of Mount Majura too - inappropriate plantings for this region unfortunately, as they are becoming invasive.