The fine, thread-like foliage of 'Iron Butterfly' appears on a well branched plant and feature clusters of fluffy purple flowers in late August and early September.
| Perennial | |
| Vernonia | |
| Iron Weed | |
| Zone 4 | |
| 6+ hours | |
| Moist, Sandy | |
| Plant with Echinacea and Perovskia | |
| Combine with Grasses and Phlox | |
| 30-36" | |
| 24-20" | |
| Summer | |
| Purple | |
| Rapid | |
| Upright | |
| Flower-tone | |
| Yes | |
| Yes | |
| Echinacea, Perovskia, Grasses, Phlox |