Scientific: Yucca thompsoniana (synonym: Yucca rostrata, Yucca rostrata var. linearis)
Common: beaked yucca, Thompson yucca
Family: Asparagaceae (subfamily Agavoideae)
Origin: Southwest Texas near the Rio Grande river near and within Big Bend National Park into Chihuahua, Mexico.

Pronounciation: YUK-ka thomp-son-ee-A-na

Hardiness zones
Sunset
5-24
USDA 6-11

Landscape Use: Specimen accent, Spanish architecture

Form & Character: Upright, stiff, alarming and dangerous, arborescent with age, stately.

Growth Habit: Evergreen, semi-woody perennial, often many branches and upright to 10 feet with up to an equal spread.

Foliage/texture: Relatively stiff and dagger like glaucous leaves with finely serrate and yellowed margins (up to 24 inches in length in length) tapering to a sharp tip; medium texture.

Flowers & fruits: Multiple, extended slender panicles of creamy white-colored, bell-shaped flowers, stalks to 5 feet tall. Fruits are a non-ornamental capsule, seeds are a dull black.

Seasonal color: Cream white flowers during late spring.

Temperature: Heat tolerant and VERY cold tolerant to -10oF.

Light: Full sun in Phoenix.

Soil: Tolerant, grows best in alkaline soil.

Watering: Very drought tolerant, but looks better with occassional summer irrigation.

Pruning: Remove spent flower and fruiting stalks only. Leave the dead leaves on for authenticity as they create a very tight skirt.

Propagation: Seed (soak seed in tepid water for 24 hours before sowing to shorten germination period), offsets, and root cuttings

Disease and pests: None

Additional comments: Yucca thompsoniana looks like a smaller hybridized version of Y. brevifolia and Y. rostrata. There is a very boss looking dwarf phenotype that grows only on the Edwards Plateau of Texas. Beaked yucca is found over a wide range of landscape across the United States from Brooklyn, New York to Tarzana, California. It grows exceptionally well in Phoenix and Tucson, Arizona.

Taxonomic footnote: Some taxonomic confusion exists among yucca enthusiasts between Yucca thompsoniana and Yucca rigida.