Spanish dagger
Yucca gloriosa
Spanish dagger, also called mound lily yucca, is an evergreen yucca of coastal sand dunes, beaches and the borders of brackish marshes in the southeastern United States, from North Carolina to northern Florida. The Lady Bird Johnson Wildflower Center calls it rare and local in the wild, yet it reached Europe around 1550 and is one of the most common yuccas in cultivation. Its sword-shaped, blue-grey to green leaves end in sharp tips, so where it goes is a decision, not a detail: keep it back from paths and play areas, or do as UF/IFAS suggests and shear the tips off where it stands near an entry. It grows slowly from a stemless rosette into a clump 6 to 8 feet tall and 4 to 8 feet wide on short, woody trunks, and sends up tall panicles of creamy white bells, often tinged red or purple. Wikipedia reports genetic evidence that it arose from hybrids between Spanish bayonet and Adam's needle. It takes salt spray, heat and drought, grows in zones 6 to 11, and the ASPCA lists yuccas as toxic to dogs, cats and horses.
Native: 7 US states
Climate fit: moderate (58/100)
Border
Container
Focal point
Pollinator
Structure
Light
Full sun / Part sun
Water
Low water
Mature size
6-8 ft tall · 3 ft apart
Hardy in zones
6a-11b
cold to nearly frost-free winters
Life cycle
Perennial
Bloom period
Spring / Summer
Native in Illinois
No
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Native across 7 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 30 ecoregions - 27 climate-resilient through 2070 · 3 newly possible by 2070. Best matches first.
Similar plants
Browse lateral options with similar roles, light needs, size, or native-range overlap; these are not filtered for a better climate fit.
Educator packet
Plant packet
Spanish dagger educator packet
Spanish dagger, also called mound lily yucca, is an evergreen yucca of coastal sand dunes, beaches and the borders of brackish marshes in the southeastern United States, from North Carolina to northern Florida. The Lady Bird Johnson Wildflower Center calls it rare and local in the wild, yet it reached Europe around 1550 and is one of the most common yuccas in cultivation. Its sword-shaped, blue-grey to green leaves end in sharp tips, so where it goes is a decision, not a detail: keep it back from paths and play areas, or do as UF/IFAS suggests and shear the tips off where it stands near an entry. It grows slowly from a stemless rosette into a clump 6 to 8 feet tall and 4 to 8 feet wide on short, woody trunks, and sends up tall panicles of creamy white bells, often tinged red or purple. Wikipedia reports genetic evidence that it arose from hybrids between Spanish bayonet and Adam's needle. It takes salt spray, heat and drought, grows in zones 6 to 11, and the ASPCA lists yuccas as toxic to dogs, cats and horses.
Scientific name
Yucca gloriosa
Plant type
shrub
Hardiness
6a-11b
Light
full-sun, part-sun
Moisture
low
Spacing
3 ft
Classroom prompts
- Which plant traits are observations, and which are care recommendations?
- How would this plant fit change if the garden location moved warmer, colder, wetter, or drier?
- Which source-backed facts would you cite in a lesson handout?
Use the Sources & citations section below for page citation styles and the field-level source list.
Sources & citations
Cite this page
For lesson plans, articles, or research that uses this page. Use the source cards below to explore the references that informed this record.
Plotwright. (2026, May 17). Spanish dagger (Yucca gloriosa). Retrieved from https://plotwright.com/plants/yucca-gloriosa
Sources used for this record
This record is compiled from the sources below.
Lady Bird Johnson Wildflower Center Native Plant Database
Botanical research database





