24-36” x 18-24” wide. Here is a distinctive, new-to-cultivation native perennial that provides both flower color and foliar texture in the garden. Selected as a more compact version of a little known wildflower species from Arkansas, ‘Iron Butterfly’ is a densely branched perennial with finely textured, almost thread-like foliage and bright violet-purple flowers capping the stems in late summer-early fall. A rich source of natural nectar, the plant is extremely attractive to butterflies. Zones 4-9. Catalog and Internet only.