Grow Native Prairie Ironweed from Seed
Add vivid late-summer color to a meadow, pollinator garden, or rain-garden edge with prairie ironweed (Vernonia fasciculata). This North American native perennial produces upright stems topped with rich purple flower clusters that attract bees and butterflies. Choose 100, 200, or 400 seeds above. Ships from the USA.
Why Choose Prairie Ironweed?
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Native perennial wildflower for long-lasting garden plantings
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Vivid purple blooms provide valuable color from mid to late summer
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Attracts pollinators, including bees and butterflies
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Suitable for medium to moist soil and tolerant of heavier clay
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Strong upright growth makes an excellent meadow or border backdrop
What’s in the Pack
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Quantity: Choose 100, 200, or 400 ironweed seeds
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Species: Vernonia fasciculata, commonly called prairie ironweed
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Included: Seeds only; containers, soil, and growing supplies are not included
Growing Information
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Plant type: Native herbaceous perennial
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USDA zones: 4–9
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Light: Full sun is best; light partial shade is tolerated
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Soil: Medium to moist, well-drained soil; tolerates clay
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Mature height: Approximately 3–6 ft
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Spacing: 18–24 in.
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Bloom period: Mid to late summer, commonly July through September
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Flower color: Purple
How to Grow Ironweed from Seed
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Choose a sowing method: Sow outdoors in late fall for natural winter stratification, or cold-moist stratify seeds for 30–60 days before spring sowing.
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Sow shallowly: Press seeds onto the surface of moist seed-starting mix or cover very lightly, no deeper than about 1/8 in.
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Maintain moisture: Keep the growing medium evenly moist but not waterlogged.
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Provide light: Place spring-sown trays in bright light and transplant established seedlings after frost danger has passed.
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Allow time to establish: Native perennials often focus on root growth during their first season. Flowering may begin in the first year under ideal conditions, but many plants bloom from the second growing season.
Please note: Germination timing varies with stratification, temperature, moisture, and growing conditions. Do not discard trays too early.
Frequently Asked Questions
Do ironweed seeds need cold stratification?
Cold-moist stratification is recommended for spring sowing. Provide 30–60 days of cold, moist conditions, or sow outdoors in late fall and allow winter weather to stratify the seeds naturally.
How much sun does prairie ironweed need?
Full sun produces the strongest growth and best flowering. The plant can tolerate light partial shade, although stems may stretch more in lower light.
How tall does Vernonia fasciculata grow?
Mature plants commonly reach about 3–6 ft. In rich or consistently moist soil, early-summer pruning can help maintain a shorter, bushier shape.
Is ironweed suitable for rain gardens?
Yes. Its preference for medium to moist soil makes it useful along rain-garden edges, in moist meadows, and in heavier clay soils.
Will ironweed spread?
Prairie ironweed forms a perennial clump and may self-seed when conditions are favorable. Remove spent flowers if you want to limit volunteer seedlings.
How many seeds are included?
Select 100 Seeds, 200 Seeds, or 400 Seeds from the Seed Count options above.
