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A picture of a Giant Ironweed

Giant Ironweed

Vernonia gigantea

Also known as

Tall Ironweed

Full Sun
Moderate watering
Frost Hardy

6a

USDA zone

-23°C

Minimum temperature

Expected size

Height
Spread

2.5m

Max

2m

1.5m

Min

1m

Flowering

  • spring
  • summer
  • autumn
  • winter

More images of Giant Ironweed

A photo of Giant Ironweed
A photo of Giant Ironweed

Giant Ironweed Overview

One of the tallest Ironweeds, capable of growing 2-3 metres in a season. Has stiff, leafy stems that branch out at the top. Native to river banks, wetlands and wildflower meadows. Prefers moister conditions but will grow in most average garden soils.

Other uses of Giant Ironweed

Effective background plant for borders or 'naturalised' in meadows or by water.