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Vernonie des prairies
Vernonia fasciculata
Une grande vivace de prairie nord-américaine, formant des touffes, couronnée à la fin de l'été par de larges grappes plates de fleurs d'un rouge-violet intense. Native des prairies humides à hautes herbes, des prés humides et des berges du centre des États-Unis et de la prairie canadienne, elle atteint de 3 à 6 pieds sur des tiges rigides et non ramifiées, et exige le plein soleil avec un sol constamment humide. Son nectar de fin de saison en fait une plante pollinisatrice exceptionnelle : une halte de ravitaillement pour les monarques migrant vers le sud et un aimant pour les abeilles indigènes et les papillons lorsque presque rien d'autre ne fleurit.
Native: 17 US states + 2 CA provinces
Climate fit: moderate (64/100)
Pollinator
Structure
Light
Full sun
Water
Consistent moisture
Mature size
36-72" tall · 24" apart
Hardy in zones
3a-7b
brutally cold to cold winters
Native in Illinois
Yes
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Native across 19 US states and Canadian provinces — a wide-ranging part of North America's plant communities.
Cold hardiness
Future
These values are location-based: this location's current hardiness is the baseline, and the 2050 value is a projected future climate for this same location.
Now
Zone 6b
USDA
Published baseline for this location from 1991-2020.
Source: USDA Plant Hardiness Zone Map 2023 (1991-2020 climatology) via ArcGIS FeatureServer
Well-suited
2050
Zone 7a
Plotwright
Projected zone for this same location in 2050 (2041-2070) using SSP3-7.0 (regional rivalry).
Well-suited
In plain terms: This location is in Zone 6b today. Its hardiness profile is cold winters, and coldest nights are typically around -3°F. By 2050, the projected hardiness zone is Zone 7a based on SSP3-7.0 (regional rivalry). That is a +0.5-zone shift from Zone 6b to Zone 7a by 2050.
✓
Well-suited today and still thriving in 2050.
Heat tolerance
Future
Heat tolerance values are location-based too: heat days today are observed at this site, and the 2050 value projects this same location under a future climate.
Loading AHS heat-zone data for this location...
Where this plant fits
Suitable across 34 ecoregions — 26 climate-resilient through 2070 · 8 suited today. Best matches first.
Appalachian mixed mesophytic forests
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Appalachian-Blue Ridge forests
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Arizona Mountains forests
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Blue Mountains forests
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Canadian Aspen forests and parklands
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Central Tallgrass prairie
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Central-Southern Cascades Forests
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Colorado Rockies forests
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Cross-Timbers savanna-woodland
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Eastern Canadian Forest-Boreal transition
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Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. To cite a single upstream fact instead, use its specific source listed below.
Plotwright. (2026, May 17). Vernonie des prairies (Vernonia fasciculata). Retrieved 2026, June 14, from https://plotwright.garden/plants/vernonia-fasciculata
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
GBIF
Botanical research database
Backs 17 fields
Identity
Summary
Plant type
Light
Moisture
Hardiness
Heat zone
Size
Spacing
Habit
Design roles
Seasonal interest
Growth stages
Lifecycle
Regional guidance
Success tips
Designer notes