Water
Water regularly, especially during dry spells, to maintain consistent soil moisture. Avoid waterlogged conditions.
Also known as Tall Ironweed
Giant Ironweed (Vernonia gigantea) is a tall, upright perennial wildflower native to eastern North America, known for its striking purple flower clusters in late summer.
At-a-glance light, water, soil, and growing conditions from plant data
Full sun to partial shade.
90% intensity
Full sun is optimal for best flowering.
Prefers consistently moist soil; water when top inch is dry.
70% intensity
Adaptable to various soil types, but thrives in moist, well-drained loams. Tolerates clay and sandy soils.
50% intensity
Prefers moderate temperatures during the growing season.
60% intensity
Tolerates a range of temperatures once established.
Outdoor
50% intensity
Light feeding in spring if needed.
30% intensity
Generally not a heavy feeder.
Safety information from plant toxicity data
| Attribute | Value |
|---|---|
| Toxic for humans | No 0/5 intensity |
| Toxic for pets | No 0/5 intensity |
| Edible | No |
Key traits and growing stats from plant data
Watering, pruning, propagation, and repotting details from plant data
Water regularly, especially during dry spells, to maintain consistent soil moisture. Avoid waterlogged conditions.
Cut back dead stems in late winter or early spring before new growth emerges. Deadheading spent flowers can prevent self-seeding if desired.
Easily propagated from seed sown in fall or early spring. Division of established clumps in early spring is also effective.
Not applicable for this ground-planted perennial.
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Monthly activity intensity for bloom and fruit across both hemispheres.
Flowering & fruiting calendar
Flowering & fruiting calendar
Photos of Giant Ironweed (Vernonia gigantea)
Where Giant Ironweed (Vernonia gigantea) is found
Density
Tap map to explore
Common names and botanical synonyms
Botanical classification
| Rank | Name |
|---|---|
| Kingdom | Plantae |
| Division | Tracheophyta |
| Class | Magnoliopsida |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Vernonia |
| Species | Vernonia gigantea |
Similar in genus Vernonia
Answers based on plant encyclopedia data
