-
ARCHIVE: Archive pages serve as reference only. We will not be offering these plants in 2025. To receive updates on future availability, please sign up for the waitlist on the plant page.
threadleaf ironweed
Vernonia lettermannii
Vernonia lettermannii
Ironweed are tall US natives that look quite similar to each other. All bloom late in the season; purple flowers are much loved by pollinators, especially butterflies.
Threadleaf ironweed is a compact clump-forming perennial with finely textured narrow leaves. Picture a small, rounded Amsonia hubrichtii with purple fall flowers. It tolerates hot, dry, rocky soil just as well as moist soil.
Zones: 4 to 9
Family: Asteraceae
Type: Perennial
Height: 24 to 36 in.
Spread: 24 to 36 in.
Exposure: Full Sun
Soil Conditions: Dry, average, moist
Bloom Time: August to September
Bloom Color: bright purple-violet
Native Range: Arkansas and Oklahoma