Since the plants keep spreading, McKiernan said, the next step would be to fly a plane or drone overhead and coat the whole area with chemicals, which he won’t do. “It’ll kill the legumes, it’ll kill the native forbs (wildflowers). It will kill every plant that isn’t grass,” he said. “Why would we spend that money and create this environmental impact that we don’t even know the extent of?” And based on his experience, the woody plants would simply return a few years later.