perennialN. America Native

Prairie Ironweed

Vernonia fasciculata

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

36 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Moderate

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

Vernonia fasciculata, commonly known as eastern ironweed, is a perennial herb that features sturdy stems and clusters of purple flowers. It is adaptable to various soil types and conditions. Known for its ability to thrive in poor soil and attract a variety of pollinators.

Bloom Period:

EarlyLate

Uses & Benefits:

Vernonia fasciculata provides vibrant purple flowers that attract pollinators, adding lively color to wildflower gardens.

Serves as a natural pest repellent and supports biodiversity.

Supports butterflies and bees, promoting pollination and ecosystem health.

Marketplace

Where to Buy

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Planting

How to Grow

Select a sunny location with well-draining soil for planting.
Tuck seeds about 1/4 inch deep into moist soil in early spring.
Water regularly to keep soil consistently moist but not waterlogged.
Thin seedlings to allow proper space for growth, about 12 inches apart.
Fertilize with a balanced, slow-release fertilizer during the growing season.
Mist cuttings or divide mature plants in early spring or fall for propagation.

Pro Tip

Mulch around plants to retain moisture and suppress weeds, especially in hot climates.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Prune dead or damaged stems in late winter
Fertilize in spring with a balanced fertilizer
Support taller plants if needed to prevent lodging

Don't

Avoid overwatering, which can cause root rot ❌
Do not disturb roots during peak flowering
Refrain from using excessive chemical fertilizers
Avoid planting in poorly drained soils

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Prune
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower meadow with vibrant purple bloomsButterfly-friendly garden borderNaturalized roadside planting

Companion Plants

Echinacea Liatris Solidago Asclepias Rudbeckia

Multiply

Propagation Methods

Good to Know

Common Questions

Prairie Ironweed questions

What zones can Prairie Ironweed grow in?

Prairie Ironweed is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Prairie Ironweed deer resistant?

Yes — Prairie Ironweed is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Prairie Ironweed bloom?

Prairie Ironweed typically blooms in late summer through early fall. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Prairie Ironweed need full sun?

Prairie Ironweed does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.