Twisted Leaf Yucca.
Yucca rupicola, Agave Family: ( Agavaceae ), Twisted Leaf Yucca. Also called: Yucca tortifolia, Twisted Yucca, Twist Leaf Yucca, Texas yucca.

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Twisted Leaf Yucca is an evergreen, perennial, which grows from 1 to 2 feet high (to 5 feet or more with flower stalk) and 1 to 2 feet wide. It is easily identified by its flaccid, twisted leaves!

Twist-leaf yucca ia very attractive and is ideal for small spaces where the larger yuccas can not be planted. It is great in rock gardens, wildscapes and raised accent beds.

It will grow in full sun, part sun or light shade. This plant needs little care once established.

Quick Notes:

Height: Up to about 3 -7 feet tall and 12 - 24 inches wide.

Flowers: Large pendulous greenish-white to cream white, sometimes tinged with purple. On a five foot stalk.

Flowering Time: Phoenix Arizona, June - July.

Leaves: The leaves are narrow, undulate, olive-green, and they twist as they age. The leaf margins can be yellow, orange or red, with minute sharp teeth.

Found: Native to North Central Texas, extending into the Edwards Plateau, growing on rocky soil and outcrops of the Blackland Prairies and the Grand Prairie. The USDA claims it is native to the USA (TX).

Hardiness: Said to be hardy at Zone 7 or 0�F - 10�F.

USDA Zone 7a: to -17.7 �C (0 �F)
USDA Zone 7b: to -14.9 �C (5 �F)
USDA Zone 8a: to -12.2 �C (10 �F)
USDA Zone 8b: to -9.4 �C (15 �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
Partial Shade

Elevation: 0 - 4,800 Feet. In Arizona.

Habitat: Found on rocky slopes or sites with very poor dry soil covering rock. Rupicola means "lover of rock." An ideal xeriscape landscape plant in Arizona.

Miscellaneous: Maintenance: Low.