Beaked Yucca.
Yucca rostrata, Agave Family ( Agaveae or Agavaceae ), Beaked Yucca. Also called: Big Bend Yucca, Soyate, and Palmita.

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Beaked Yucca is a slow-growing tree-like yucca. Often it has only one trunk, which can grow to about 12 - 15 feet tall. It has 2 foot long, stiff, slightly waxy, pale bluish-green leaves with yellow margins that form a dense rosette on top of the stems. When the old leaves fall off, they leave a fibrous soft gray covering on the trunk. Yucca rostrata has large clusters of white flowers which bloom on itstall stalks in the spring. It grows best in warm sunny areas.

Some consider Yucca thompsoniana as the same species, but a branching form of Yucca rostrata.

Can take full sun in Phoenix or Tucson.

Quick Notes:

Height: Up to about 12 - 16 feet tall. Spreads about 6 - 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 freeze past the low 20 �F' ! However, some say that they have grown it at lower temperatures.

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. Hardiness: 15 - 20� F. Photos Taken: Boyce Thompson Arboretum, Superior, Arizona. May 13, 2008.