When I bought my unit back in 1997 we had a small rockery at the front, in it was a very small bit of asparagus fern, it just stayed in the one spot never getting any bigger, it was wedged in a spot where it couldn't expand, I really grew to like looking at it even though it was a noxious weed, another woman bought a unit later on and was a so call expert on gardening so she just ripped it out but she replaced the spot with what looked like paterson's curse so I just ripped it out and disposed of it a plastic bag in the garbage.
I do agree about feral cats but it all comes back to who let the cats get wild to roam free and dumped in the bush in the first place, irresponsible humans just like the idiots who dumped carp and goldfish into our river systems killing off most of the native fish populations, then there was all the good intentions with rabbits and foxes with the first settlers which have turned into an ecological disaster and also more recently the cane toads, could go on and on but it all comes backs to one common denominator, human beings.