perennial

Tall Ironweed

Vernonia altissima 'Purple Pillar'

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Essentials

At a Glance

Plant Type

Perennial

Height

72 inches

Width

24 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Medium to wet

Humidity

Average

Lifespan

Perennial

Native To

Eastern and Central North America

Toxicity

Non-toxic

The Story

Plant Bio

Vernonia altissima, or Tall Ironweed, is a robust North American native perennial. It forms clumps of tall, sturdy stems bearing lance-shaped, dark green leaves. In late summer, it is topped by large, flattened clusters of small, fluffy, deep purple composite flowers. Selected for its exceptionally narrow, columnar habit, 'Purple Pillar' grows in a tight, upright form without needing support. Its vertical structure makes it an excellent 'exclamation point' in the garden, suitable for smaller spaces than the wider species.

Uses & Benefits:

A striking vertical accent that adds vibrant color to garden beds.

Drought tolerant and deer resistant, reducing maintenance needs.

Provides nectar for pollinators and supports local biodiversity.

Marketplace

Where to Buy

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Planting

How to Grow

Tuck seeds into well-drained soil in spring.
Water regularly until established, about 6 weeks.
Provide full sun for optimal growth.
Fertilize lightly in early spring with balanced fertilizer.
Stake young plants if needed for support.
Deadhead spent flowers to encourage more blooms.

Pro Tip

Ensure well-drained soil and full sun for best flowering performance.

Keep It Thriving

Care Guide

Do

Water deeply during dry spells 🌱
Prune after flowering to maintain shape
Mulch to retain soil moisture

Don't

Avoid overwatering to prevent root rot ❌
Don’t fertilize late in the season
Never let soil stay waterlogged

Seasonal Care Calendar

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

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Vibrant purple borderPollinator-friendly perennial bed

Companion Plants

Echinacea Rudbeckia Salvia Coreopsis Gaillardia

Multiply

Propagation Methods

Good to Know

Common Questions

Tall Ironweed questions

What zones can Tall Ironweed grow in?

Tall 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 Tall Ironweed deer resistant?

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

When does Tall Ironweed bloom?

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

Does Tall Ironweed need full sun?

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