tall ironweed vernonia altissima Vernonia altissima | tall ironweed

tall ironweed vernonia altissima Vernonia altissima | tall ironweedIronweed are tall US natives that look quite similar to each other. All bloom late in the season; purple flowers are much loved by pollinators, especially butterflies. Giant ironweed or tall ironweed is one of the tallest ironweeds, growing up to 10' high! It is exceptionally tough, succeeding on dry, average, moist, or wet soil in full sun or part shade. However, it is happiest and grows tallest on medium soil. syn. Vernonia gigantea Zones: 5 to 8

Ironweed are tall US natives that look quite similar to each other. All bloom late in the season; purple flowers are much loved by pollinators, especially butterflies.

Giant ironweed or tall ironweed is one of the tallest ironweeds, growing up to 10' high! It is exceptionally tough, succeeding on dry, average, moist, or wet soil in full sun or part shade. However, it is happiest and grows tallest on medium soil.

syn. Vernonia gigantea

Zones: 5 to 8
Family: Asteraceae
Type: Perennial
Height: 60 to 96 in.
Spread: 36 to 72 in.
Exposure: Full Sun to Part Shade
Soil Conditions: Medium to Wet
Bloom Time: August to September
Bloom Color: purple-violet
Native Range: from Iowa and Kansas south to Texas and east to New York south to Florida with the exception New Jersey

Growers note: These late fall bloomers take a long time to emerge from winter dormancy in four-inch pots. New shoots did not appear until the first week of June on many plants in the nursery.