SITE

Ironweed

Botanical Name

Vernonia spp.

Min Zone

4

Max Zone

9

Height

4 to 8 feet

Width

2 to 4 feet

Flowers

July to September: purple-violet cyme

Light

Full sun

Soil

Moist to wet soil

Planting & Care

• Self seeds and can spread rapidly
• Deadhead to control self seeding
• Plants can be trimmed back to ground level in late spring to control height
• Tolerent of brief flooding
• Plants grow taller in wet soils

Problems

None serious

Varieties

• Vernonia lettermannii 'Iron Butterfly' - this species is native to gravely plains making it very tolerant of hot and dry conditions and still tolerant of periods of flooding, fine foliage resembling Amsonia hubrichtii, compact 30 to 36 inches tall and wide
• V. angustifolia 'Plum Peachy' - narrow leaves, 4 feet tall and wide
• V. noveborecensis - 4 to 8 feet tall
• V. fasciculata - 2 to 4 feet tall