Threadleaf Ironweed

Plant Information

Taxonomic Name: Vernonia lettermannii cv. Iron Butterfly
Common Name: Threadleaf Ironweed
Type: Herbaceous Perennial
Zone: 4, 5, 6, 7, 8, 9
Bloom Time: September to October
Height: 24-36 inches
Light Requirements: Full sun, Morning shade with afternoon sun, Morning sun with afternoon shade
Soil Conditions: Tolerates periodic drought, Average well-drained soil
Flower Color: Purple
Wildlife: Bees, Butterflies
Special Characteristics:
  • Shrub-like perennial
  • Fine textured needle-like foliage gives a soft appearance
  • Blooms late summer to early fall with an abundance of purple flowers
  • Vigorous growth
  • Deer tolerant
Potential Pests: Slugs, snails
Serious Diseases: Powdery mildew; rust; leaf spot