Soaptree Yucca has slender blades that grow to four feet long, developing white threads along margins as they mature. Old leaves turn yellow and bend down, forming an attractive barrier around trunk. Flowers form on stalks emerging from central portion of each branch, growing 4 to 6 feet above foliage. Flowers are white and bell-shaped, blooming in the spring. Brown seed pots form after flowering, providing another season of interest. Slow growth to 6 to 20 feet tall with a spread of 12 feet.
This yucca is native to the Chihuanhuan Desert and is hardy to 0F. Most yuccas have fibrous roots; this has taproot and makes it very difficult to transplant. Keep winter dry. Requires well drained, deep soil; do not grow in gravel. Requires no supplemental water after establishment, though periodic watering will increase growth rate. Full sun. Listed as a USDA Zone 6 plant, so local in an area sheltered from winter winds.