New York Ironweed
Vernonia noveboracensis
Last reviewed: June 2026
New York Ironweed is a native perennial wildflower that produces clusters of bright purple blooms from July through September. This tall prairie plant thrives in full sun and attracts numerous butterflies, bees, and moths.
The USDA PLANTS Database (opens in new tab) does not flag New York Ironweed as toxic to livestock.
Light
full sun
Water
medium
Size
48"–96" H × 24"–36" W
Bloom
Jul, Aug, Sep
Native to
DE
Pollinators
bees, butterflies, moths
Vernonia noveboracensis is a tall native perennial that produces clusters of vibrant purple flowers from summer through early fall. This sturdy plant forms upright clumps and can reach 4 to 8 feet in height, making it an excellent choice for back borders or naturalized areas.
Growing New York Ironweed
Grow New York Ironweed in full sun and medium water. Mature plants reach 48 to 96 inches tall and spread 24 to 36 inches wide. Expect low maintenance to keep it looking intentional in a front yard.
In an HOA neighborhood
New York Ironweed takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.
Works well in: backyard only.
- Very tall height appears wild or uncontrolled
- Common name includes 'weed' which raises concerns
- Can look messy when stems die back in winter
Wildlife value
Host plant for American Lady butterfly, Painted Lady butterfly.
The purple blooms are magnets for bees, butterflies, and moths during late summer when many other flowers have faded. Seeds provide food for birds in fall and winter.
Common questions
- When does New York Ironweed bloom?
- New York Ironweed typically blooms from July through September, producing vibrant purple flower clusters that are highly attractive to pollinators.
- What pollinators visit New York Ironweed?
- New York Ironweed attracts a wide variety of pollinators including native bees, butterflies, and moths. The nectar-rich flowers are particularly valuable for late-season pollinator activity.
- Where is New York Ironweed native?
- New York Ironweed is native to eastern North America, including Delaware and many other states throughout the eastern United States.
- What growing conditions does New York Ironweed prefer?
- New York Ironweed grows best in full sun to partial sun with medium to moist soil conditions. It is well-adapted to prairie and meadow environments.
- Is New York Ironweed toxic to livestock?
- The USDA PLANTS Database does not flag New York Ironweed as toxic to livestock.
- Is New York Ironweed HOA-friendly?
- New York Ironweed takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Ready to grow New York Ironweed? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.
Not sure where to start? Take the 2-minute yard quiz