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Home / Perennials / Woodland Wildflowers / Giant Ironweed

Giant Ironweed

SKU: AM014841
per Bag of 3
No longer available this season.
Giant ironweed blooms in the later summer and early fall, adding grace to the very tip-top of the garden. If you do much driving in the country, you’ve seen the tall plants with bright purple aster-like flowers blooming along the roadsides. Plants provide an important late-season source of food for butterflies. Ironweed thrives in full sun and moist soils in zones 5-8. (Vernonia)
key features
Botanical Name
Vernonia gigantea
Native, Bee Friendly, Attracts Butterflies, Attracts Birds, Deer Resistant, Naturalizes
Growing Zones
Zone 5, Zone 6, Zone 7, Zone 8
Light Requirements
Full Sun, Half Sun / Half Shade
Soil Moisture
Average, Moist / Wet
Mature Height
72-96" tall (6-8 feet)
Mature Spread
36-72' wide
Bloom Time
Summer to fall


6-8 feet tall and 3-6 feet wide, Giant Ironweed (Vernonia gigantea) can provide fall fireworks in the garden or can be pruned back in mid-summer to result in a more manageable maximum height. It’s most effective for pollinator benefit and garden color when planted in multiples of three or more plants. Site plants in full sun in moist soil. Giant ironweed can tolerate wet feet for extended periods of time. They will self-sow, so deadhead when flowers fade to keep the garden tidy. Relatively easy to grow, and not prone to pest and disease problems. Pairs well with other prairie wildflowers and grasses.