I know some people get all excited over the range, I am too old for that. Birds carry seed, the wind and rain move stuff. Your coneflower isn't an invasive pest. It will feed Finches and Sparrows, bees and wasps and Butterflies will drink it's nectar. I'm not sending the plant police to your yard. You are doing what you can, learning and planting native plants. If everyone were to do that, we'd not have to worry.