perennialN. America Native

Summers Swan Song Ironweed

Vernonia 'Summer'S Swan Song'

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Essentials

At a Glance

Plant Type

Perennial

Height

33 inches

Width

42 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9

Water

Low to medium

Humidity

Adaptable

Lifespan

Long-lived perennial

Native To

North America (Hybrid)

Toxicity

Non-toxic

The Story

Plant Bio

Ironweeds (Vernonia) are robust, North American native perennials known for their intense purple flowers that bloom in late summer and fall. They are tough, adaptable plants that are highly attractive to pollinators. 'Summer's Swan Song' is a compact hybrid ironweed, reaching only about 3 feet tall, making it suitable for smaller gardens. It blooms very late in the season, providing crucial nectar for migrating monarchs and other pollinators when little else is flowering.

Bloom Period:

EarlyLate

Uses & Benefits:

'Summer's Swan Song' provides a dramatic burst of vibrant purple color at the very end of the growing season. Its sturdy, upright habit and attractive olive-green foliage provide structure in the border all summer long, culminating in a spectacular floral display.

This plant's compact size allows it to be used in a wider range of garden settings than its taller relatives. It is extremely tough, tolerating clay soil and drought once established, making it a low-maintenance choice for challenging sites.

As a very late-blooming native, it is an ecological powerhouse. It provides a critical late-season nectar source for monarch butterflies on their migration south, as well as for native bees, and other pollinators. Goldfinches and other birds feast on the seeds in winter.

Marketplace

Where to Buy

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Planting

How to Grow

Choose a site in full sun with average, well-drained soil.
Dig a hole that is as deep and twice as wide as the pot.
Gently loosen the roots if they are pot-bound.
Place the plant in the hole, with the crown level with the soil surface.
Backfill with soil and water thoroughly.
Water regularly during the first season to establish a deep root system.

Pro Tip

Do not cut back the stems in fall; the seed heads provide winter interest and food for birds like goldfinches.

Keep It Thriving

Care Guide

Do

Provide full sun for the sturdiest stems and best flowering.
Allow the plant to establish for a year before expecting peak performance.
Leave seed heads standing for winter interest and bird food.
Pair with grasses and other late-season bloomers like asters and goldenrods.

Don't

Do not plant in deep shade, which causes weak, floppy stems.
Avoid overly rich or constantly wet soil.
Don't over-fertilize; ironweed thrives in average to lean soil.
Do not cut back in mid-summer, as this will remove the flower buds.

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Pest Check
Pinch
Plant
Spring Cleanup

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Key component of a late-season pollinator gardenSturdy vertical accent in prairie or meadow plantingsBackbone plant for mixed perennial borders

Companion Plants

Schizachyrium scoparium Solidago 'Fireworks' Symphyotrichum 'October Skies' Echinacea purpurea Panicum virgatum

Multiply

Propagation Methods

Good to Know

Common Questions

Summers Swan Song Ironweed questions

What zones can Summers Swan Song Ironweed grow in?

Summers Swan Song 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 Summers Swan Song Ironweed deer resistant?

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

When does Summers Swan Song Ironweed bloom?

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

Does Summers Swan Song Ironweed need full sun?

Summers Swan Song Ironweed does best in full sun (6+ hours).

Is Summers Swan Song Ironweed drought tolerant?

Yes — once established (usually after the first full season), Summers Swan Song Ironweed handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.