Coneflowers spread by seeding. Flowers open in summer and bloom through autumn. The center cone, looking like a small hedgehog, matures and dries with seeds in the cone pods. In autumn, the small dry seeds naturally spill out on the ground, are scattered by wind or fall out as the plant dies back.Click to see full answer. Moreover, how do you propagate purple coneflowers? Start coneflower cuttings in late autumn or early winter when the plant is dormant. Prepare a rooting pot. Dig down at the outer edge of the coneflower plant until the thick, fleshy roots are plainly visible. Sever the root from the coneflower plant using a sharp, clean knife. Subsequently, question is, is purple coneflower invasive? 1. Coneflowers are a native plant. They become invasive because there is nothing to stop them from spreading and crowding out our native plants. Good examples of foreign invasive plants are kudzu in the South and purple loosestrife in the Northeast. Moreover, do coneflowers multiply? Coneflowers will multiply under good conditions, namely disturbed soil and plentiful seed that falls from the spent flower. Two Coneflower Plants that grew from seed dropped by the nearby, larger plant.Do coneflowers come back every year?The truth about newfangled varieties of Echinacea — commonly known as purple coneflower — is often not so pretty, folks. These plants are certainly sold as perennials. That means they’re supposed to be planted in the garden and then come up year after year. But the fact is they don’t.