Blue Yucca. Yucca rigida, Agave Family ( Agaveae or Agavaceae ), Blue Yucca. Also called: Mexican Blue Yucca, Silver Leaf Yucca, Palmilla, Blue Yucca, Thompson's yucca, Yucca rupicola var. rigida, Yucca thompsoniana. We wish to thank Wikipedia, the free encyclopedia for some of the information on this page. We share images and information with Wikipedia. Yucca rigida usually has a branched trunk and its flowers are creamy white and bell shaped and are borne on a 5 to 6 foot stalk. This yucca has excellent heat and drought tolerance. Can take full sun in Phoenix or Tucson. Quick Notes: Height: Up to about 12 feet tall. Spreads about 5 to 8 feet. Flowers: Its flowers are creamy white and bell shaped. It blooms in late spring on a 5 to 6 foot stalk. Flowering Time: Phoenix Arizona, Mid April - May. Leaves: The leaves are long and blue in color, tipped with a spine. The leaves are about 3 feet long by about 1 1/4 inches wide. Found: Native of the Chihuahaun desert, of northwestern Mexico in the states of northern Sonora, northern Chihuahua, Coahuila, Durango, & Nuevo Leon. The USDA claims it is native of the USA (TX). Hardiness: Will freze past the low 20 �F' ! USDA Zone 9a: to -6.6 �C (20 �F) USDA Zone 9b: to -3.8 �C (25 �F) USDA Zone 10a: to -1.1 �C (30 �F) USDA Zone 10b: to 1.7 �C (35 �F) USDA Zone 11: above 4.5 �C (40 �F) Soil pH requirements: 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline) Sun Exposure: Full Sun Elevation: 0 - 4,600 feet. In Arizona. Habitat: It grows well in sand, sandy loam, clay and other heavy soils. It needs good drainage and aeration. It is remarkably tolerant of alkali. Miscellaneous: Maintenance: Low. Photos Taken; Glendale, Arizona. March 27, 2006.

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