Yucca rigida
Common: Blue Yucca, Denticulate-leaf Yucca, Palmilla
Family: Agavaceae
Origin/Range: Mexico, (Chihuahua, Coahuila, Durango) on rocky and stony slopes among shrubs in the desert at 1200 to 1500 altitude.
Light: Full sun
Temp: Hardy in Phoenix to 10°F (-12°C)
Water: Moderate water
Soil: Needs well drained soil
Yucca rigida is very closely related to Yucca reverchoni, Yucca rupicola, Yucca pallida, Yucca rostrata and Yucca thompsoniana. The name "rigida" just means "rigid" in Latin.
The blue tinge of its foliage and its striking appearance make it a very desirable specimen in a southwestern xeriscape garden. 1 to 3 stems up to 450 cm tall and 12 to 15 cm thick, none or few branches, rosettes with many leaves. Leaves, linear slightly wider at the middle and canaliculate, bluish to yellowish green, 40 - 60 cm long, from 1.2 up to 1.7 cm wide.