Prairie Ironweed

Vernonia fasciculata

Native to:
Canada, United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Asteraceae
Genus:
Vernonia
Species:
Vernonia fasciculata
USDA Symbol:
VEFA2

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
150 cm
Light Requirements:
Full Sun,Part Shade,Shade
Drought Tolerance:
Low
Bloom Months:
jul,aug,sep
Bloom Colors:
purple, magenta

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)
Caterpillars:
★☆☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Keystone Species Ranking

Pollen Specialist Bee Keystone:
★★☆☆☆ Native pollen specialist bee species supported by this genus (NWF)

Host Plant for Caterpillars

Coleophora vernoniaeella, Northern Burdock Borer (Papaipema circumlucens), Spotted Tussock Moth (Lophocampa maculata)

Reported Fauna Sightings

Bees: American bumble (Bombus pensylvanicus), Brown-belted bumble bee (Bombus griseocollis), Common eastern (Bombus impatiens), 🛑Rusty-patched bumble (Bombus affinis) Butterflies:Eastern Tiger Swallowtail (Papilio glaucus)

Garden & Ecology Notes

Wildlife Value:
butterflies, bees, birds
Deer Resistant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts vigorously from rootstock following fire; benefits from periodic burning in prairie management.

Soil Requirements

Soil Type:
rich, well-drained loamy soil
pH:
5.5 - 7.0 (slightly acidic to neutral)
Drainage:
tolerates poor drainage
Moisture:
consistently moist
Notes:
Prefers wet prairies and meadows

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–60 days
Germination Time:
14–28 days
Notes:
Seeds require light for germination; surface sow and do not cover.

The above propagation data sourced from Claude AI

Pre-treatment: Single-step cold-moist stratification for temperate woodland species. for 60–120 days

Source: Claude AI

ORGHPS Germination Guide: Sow @ 4C for 3 months, then place @ 20C for 3 months.

Source: Ontario Rock Garden & Hardy Plant Society