Soapweed yucca
Yucca glauca
A hardy, evergreen Great Plains yucca that holds a low rosette of narrow, pale blue-green dagger-like leaves and sends up a 4 1/2-foot stalk of pendulous, greenish-white bell flowers in early summer. Extremely drought- and poor-soil tolerant, it depends on an obligate mutualism with the yucca (Pronuba) moth — the only insect that pollinates it — so seed is not produced every year. The root has long been used to make soap, giving the plant its common name.
Native: 13 US states + 2 CA provinces
Climate fit: broad (70/100)
Focal point
Structure
Pollinator
Light
Full sun
Water
Low water
Mature size
24-54" tall · 36" apart
Hardy in zones
4a-8b
very cold to frosty winters
AHS heat range
1-11
Plant range authored in AHS heat-zone terms.
Native in Illinois
No
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Native across 15 US states and Canadian provinces — a wide-ranging part of North America's plant communities.
Cold hardiness
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
Plotwright
USDA Zone 6b
-5°F to 0°F
Well-suited
Zone 7a
Plotwright
0°F to 5°F
Well-suited
In plain terms: This location has cold winters. Its winters are projected to keep warming through 2050.
✓
Well-suited today and still thriving in 2050.
Heat tolerance
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 40 ecoregions — 35 climate-resilient through 2070 · 5 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 Pacific Northwest coastal forests
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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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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). Soapweed yucca (Yucca glauca). Retrieved 2026, June 24, from https://plotwright.com/plants/yucca-glauca
Sources for every fact
Every fact on this page traces to a source. 18 fields cited - 18 source-backed.
Lady Bird Johnson Wildflower Center Native Plant Database
Botanical research database
Backs 17 fields
Identity
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