Soapweed Yucca

Soapweed Yucca (Yucca glauca) is a cold-hardy perennial with narrow, stiff leaves arranged in a low rosette. Greenish-white bells rise on an erect summer stalk, and the gray-green leaves have fine white filaments along their edges. ## Garden Placement Use this architectural plant in a sunny rock garden, dry slope, or naturalized planting where pointed leaves can be kept away from frequent foot traffic. The [North Carolina State profile](https://plants.ces.ncsu.edu/plants/yucca-glauca/common-name/small-soapweed/) describes its wildlife value, including flowers visited by butterflies and nesting cover for small wildlife. ## Growing Conditions The profile lists USDA zones 4a–8b, full sun, and dry, rocky soils with sharp drainage. It tolerates a broad soil pH range and does not tolerate waterlogged conditions. ## Maintenance This species is rated low maintenance and medium in growth rate. Leave room for its pointed leaves and remove old foliage carefully with gloves. Its roots and leaves have traditional fiber and soap uses, but the plant should not be treated as a food crop without suitable expert guidance. ## Arizona — UA elevation and care conditions (2026 audit) The [University of Arizona guide](https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1289.pdf), revised December 2011, page 4, lists Yucca glauca (Great Plains yucca) in its shrubs table. It prints water needs VL-L, sun/shade S and mature height 2-3 feet. Its elevation recommendations are 3,000 ft: Y; 4,000 ft: Y; 5,000 ft: Y; 6,000 ft: Y; 7,000 ft: Y; 8,000 ft: Y; 9,000 ft: N. Table codes: VL=very low, L=low, M=moderate and H=high water; S=full sun, PS=partial sun, Sh=shade; in grass height entries B=bunchgrass and S=sod forming. Elevation codes Y=yes, N=not recommended and ?=unknown or doubtful. Elevations are Arizona source suitability bands, not USDA hardiness zones; listed heights and moisture needs are contextual rather than universal limits. Maintain suitable moisture, remove dead branches and litter, separate planting groups and keep plants nearest structures small and widely spaced. The guide cautions that all vegetation is potential fuel and no plant is fireproof. Check local growing conditions and current defensible-space requirements; preserve separate regional source ratings. ## South Dakota — Black Hills source scope and care [South Dakota's Living With Fire guide](https://danr.sd.gov/Conservation/Forestry/docs/Living-With-Fire.pdf), printed page 15, lists “Yucca glauca” (“Great plains yucca”) under Shrubs. Exact source species represented by the unselected catalog profile. The guide states that no plant is non-burning and landscape maintenance is more important than selection alone. Choose plants for site slope, aspect, hardiness and precipitation; the list is regional, not a universal fire-resistance score. Its landscape guidance on page 14 calls for keeping plants green throughout the fire season in the 30 feet closest to structures, minimizing highly flammable fuels there and using well-irrigated perennials or suitable low-growing/non-woody deciduous plants. Keep tree limbs at least 15 feet from chimneys, power lines and structures, account for mature size and maintain open spaces between plants and plant groups. Irrigation availability affects selection and placement; manage dry and dead plant material. Keep this source association separate from Idaho numerical scores, other regional plant ratings and their conditions.