Vernonia angustifolia 'Plum Peachy' is a prairie ironweed topped with clusters of nectar-rich purple flowers on tall stems.

Vernonia 'Mammuth' is topped with clusters of warm purple flowers on tall stems in late summer and fall that attract butterflies.

Vernonia gigantea or giant ironweed makes an impressive specimen at 8-10 feet tall topped with fluffy, warm purple flowers popular with butterflies.

Vernonia 'Iron Butterfly' has feathery foliage topped with clusters of warm purple flowers in late summer and fall.