Plants have umbels of light purple-pink to creamy white flowers that are produced at the top half of the 3 to 4 foot tall stems. This species lives up to its name as 'weed' and may spread into a large colony if happy, by way of underground rhizomes. If you want to make the plants spread even more pull the plants up from the ground. Butterflies love this plant. A bit course with large rough leaves and milky sap but useful in the Wildflower and butterfly garden or used in grassland planting. This is a native to much of the eastern USA, and often classified as an agricultural weed because plowing does not kill it. Grows in full sun to part shade - does well along the margins of trees and sumac thickets. Once established very drought tolerant.