FoliageIronweed
Vernonia noveboracensis
Ironweed (Vernonia noveboracensis) is a medium-growing perennial, hardy in USDA zones 5-9, that matures to about 4-6 ft × 3-4 ft. It does best in full sun with high water needs in moist and occasionally-wet soil. Expect purple blooms in summer and fall. It attracts bees, butterflies and pollinators, stands up well to deer and wet soil.
- USDA zones
- 5-9
- Sun
- Full sun
- Water
- High
- Mature size
- 4-6 ft × 3-4 ft
- Growth rate
- Medium
- Maintenance
- Low
- Soil
- Moist, Occasionally-wet
- Bloom color
- Purple
- Bloom season
- Summer, Fall
- Attracts
- Bees, Butterflies, Pollinators, Songbirds
- Tough against
- Deer, Wet soil
- Native to
- Eastern and southeastern United States
In the landscape
Data sources
Freeze survival
Will it survive your winters?
Hardiness zones show a normal bad winter. We check the worst one — Ironweed is hardy to about -20°F (estimated from USDA zone 5), so we'll score it against the real coldest nights your area has actually had.
Powered by ~35 years of daily lows from the nearest NOAA weather station. A risk read, not a guarantee — a sheltered spot or mature plant beats the odds.
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