perennial

Tall Ironweed

Vernonia altissima

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

72 inches

Width

36 inches

Light

Full Sun

Zones

5, 6, 7, 8, 9

Water

Moderate, prefers consistent moisture

Humidity

Average garden humidity

Lifespan

Perennial

Native To

Eastern and Central North America

Toxicity

Non-toxic to humans and pets

The Story

Plant Bio

Tall, upright herbaceous perennial with sturdy, leafy stems. Features lance-shaped, dark green leaves and large, fluffy, terminal clusters of tiny, deep purple, composite flowers in late summer to early fall. This species is notable for its exceptional height, attracting numerous butterflies, and its tolerance of moist to wet soils. The flowers do not have ray florets.

Bloom Period:

EarlyLate

Uses & Benefits:

Tall purple blooms add vertical interest and attract pollinators.

Provides nectar for bees and butterflies, supporting local ecology.

Supports native pollinators and beneficial insects.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck seeds into moist soil in early spring
Water regularly to keep soil evenly moist
Fertilize with a balanced fertilizer in spring
Divide clumps every 3–4 years in early spring
Stake young plants for support if needed
Mulch around base to retain moisture

Pro Tip

Plant in well-drained soil with full sun for best growth.

Keep It Thriving

Care Guide

Do

Water consistently during dry spells 🌱
Prune back after flowering to promote bushiness
Apply organic compost annually
Support tall stems with stakes

Don't

Avoid overwatering in winter ❌
Do not disturb roots during peak flowering
Refrain from excessive fertilizing

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pinch
Spring Cleanup
Winter Prep

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Wildflower meadow with tall purple accentsSunny border for late season colorPollinator-friendly garden edge

Companion Plants

Echinacea purpurea Rudbeckia hirta Asclepias tuberosa Solidago spp.

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 5–9. 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 through late fall. 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 (6+ hours).