Vernonia lettermannii 'Iron Butterfly' Threadleaf Ironweed

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Vernonia lettermannii 'Iron Butterfly' forms vigorous clumps of narrow stems with fine, feathery foliage that are topped by clusters of fluffy, true purple blooms at stem ends in late summer and early fall. Vernonia lettermannii 'Iron Butterfly' foliage resembles that of Amsonia hubrichtii. The blooms are loved by butterflies and is very nice planted with grasses and other late summer blooming perennials.

Vernonia lettermannii, also known as Threadleaf Ironweed, is native to Arkansas and Oklahoma. It is typically found on gravel river bars and nearby rocky outcrops.

Vernonia lettermannii 'Iron Butterfly' prefers full sun and well-drained soil, but is very tolerant of rough, sandy, infertile, dry soils and hot, dry locations. However, it can withstand occasional flooding. Rust resistant.


  • Common Names: Ironweed
  • Zones: 4-9
  • Light Requirements: Full Sun to Light Shade
  • Soil Preference: Prefers moist, well-drained soil
  • Height at Maturity: 30-36
  • Width at Maturity: 36
  • Bloom Color: Purple
  • Bloom Time: Late summer to early fall

Special Features

  • Attracts: Butterflies. Hummingbirds. Pollinators.
  • Tolerates: Clay Soil. Drought.
  • Other Features:

Care and Growing Tips

Check out our blog for more gardening tips!

Shipping Info

We will ship your plants within nine days of placing the order, on either a Monday or a Tuesday. We ship early in the week to ensure that plants do not get stranded in transit over the weekend. You'll receive a tracking number when your order ships.

We appreciate your patience while our small team works to get these live plants to you safely.


    If you need your plants shipped a specific week, please make a note on the Cart page before placing the order, or reply to your order confirmation email. Thank you!

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    We ship via UPS or USPS (the Post Office), and their ship rates are automatically generated through our site. We do not profit on shipping costs. We are working with these providers to get our customers the best rates possible.

    All ship times are subject to change if extreme weather conditions are present here at the nursery or at the shipping destination.

    Please note: Depending on the time of year, the foliage of the plants may be trimmed to fit into our shipping boxes. This could delay the flowering of the plant, but many perennials actually benefit from being cut back.

    We are currently not able to ship to Puerto Rico, Hawaii, and outside of the US.