One man's weed is another man's flower (or however the phrase goes. This cactus is a noxious invasive plant in Australia, as most of our introduced cacti are. Sorry guys! It behaves itself well in its native environment. It's the grass in the photo that is the invasive problem here.)
That's so weird isn't it. We must be lacking some native mechanism that helps keep them under control. The prickly pear became less of a scourge after they introduced the beetles.
