Plant Profile

Prairie Ironweed (Vernonia fasciculata) is usually referred to simply as "Ironweed". The common name has been attached to this plant thanks to its extremely strong stems. Meanwhile, the genus Vernonia is a tribute to the English botanist William Vernon (1666 - 1730). He was known most for his work in exploring mosses. The specific epithet fasciculata comes from Latin and translates to ‘a bundle or cluster’ which references the flowering heads. This stately plant is common throughout the Central and Upper Midwest portions of the US and stretches into western Canada.

Prairie Ironweed occurs naturally in moist soils and tolerates brief flooding, although it will grow equally well in average garden soils. This lovely plant offers a large cluster of brilliant purple flowers on top of 6' tall, unbranched stems. Dark green, coarsely-toothed leaves add to the overall interest. The plant height may be reduced by cutting-back the stems in late spring. The purple blooming color stands out in the late summer landscape, attracting many butterflies and other pollinators.

It can be considered an aggressive spreader by seed when the site conditions are favorable. Self-seeding can be mitigated by removing some of the flower heads before they go to seed. However, the dark rigid stems topped with contrasting fluffy seed heads do offer beautiful late season interest. Prairie Ironweed is a great choice for creating a backdrop to your garden by using it as a tall border and it will work equally well in cottage gardens, rain gardens, or in native meadows.