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Grande herbe bleue

Grande herbe bleue

Andropogon gerardii
La graminée emblématique de la prairie herbeuse nord-américaine — une graminée touffue de saison chaude, grande et à racines profondes, surnommée « pied de dindon » pour ses épis divisés en trois parties, rouge pourpré. Le feuillage bleu-vert estival s'élève à 4-8 feet et prend des teintes marron-fauve pour l'automne et l'hiver. Très résistante à la sécheresse et à l'érosion une fois établie ; plante hôte larvaire pour les papillons Hespérides et abri pour une vingtaine d'espèces de passereaux.
Native: 44 US states + 4 CA provinces
Climate fit: broad (83/100)
Structure
Pollinator
Light
Full sun
Water
Moderate water
Mature size
48-96" tall · 24" apart
Hardy in zones
4a-9b
very cold to frosty winters
AHS heat range
4-12
Plant range authored in AHS heat-zone terms.
Native in Illinois
Yes
A documented larval host for the Skipper butterflies — specialist wildlife that depend on plants like this to reproduce.

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...

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). Grande herbe bleue (Andropogon gerardii). Retrieved 2026, June 14, from https://plotwright.garden/plants/andropogon-gerardii
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
Missouri Botanical Garden PlantFinder
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
Wikimedia Commons
Photo · CC BY 4.0
Backs 1 field
Image
Lady Bird Johnson Wildflower Center Native Plant Database
Botanical research database