When does New York Ironweed bloom?

New York Ironweed typically blooms from July through September, producing clusters of small purple flower heads atop tall stems.

What pollinators visit New York Ironweed?

Bees, butterflies and moths regularly visit New York Ironweed for its nectar during its summer bloom period.

How much water does New York Ironweed need?

It grows best in medium to consistently moist soil and is often found along stream banks, ditches and in wet meadows.

How much sun does New York Ironweed need?

It flowers most heavily in full sun but can still grow and bloom, though less vigorously, with some part sun or light shade.

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.

New York Ironweed

Name: Pollinator Patch
Author: Pollinator Patch

Vernonia noveboracensis

Last reviewed: September 2026

New York Ironweed is a tall perennial forb that blooms with deep purple flower clusters from July through September in full sun. It thrives in moist meadows, roadsides and stream banks across the eastern United States.

Toxicity unknown

New York Ironweed (Vernonia noveboracensis) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

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

AL, CT, DE, FL and 12 more states

Pollinators

bees, butterflies, moths

Before you buy

Your city may pay you to plant this

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Browse plants for this ecoregion

Piedmont Northeastern Highlands Northeastern Coastal Zone Erie Drift Plain Northern Forests Middle Atlantic Coastal Plain Northern Piedmont Southeastern Plains Blue Ridge Ridge and Valley Central Appalachians Western Allegheny Plateau Southern Coastal Plain Atlantic Coastal Pine Barrens

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 clusters of small purple flower heads atop tall stems.
What pollinators visit New York Ironweed?: Bees, butterflies and moths regularly visit New York Ironweed for its nectar during its summer bloom period.
How much water does New York Ironweed need?: It grows best in medium to consistently moist soil and is often found along stream banks, ditches and in wet meadows.
How much sun does New York Ironweed need?: It flowers most heavily in full sun but can still grow and bloom, though less vigorously, with some part sun or light shade.
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.

These answers were drafted with an AI model from this plant's data. Verify care details with a local expert.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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