Scientific: Yucca guatemalensis (formerly Y. elephantipes and Y. gigantea)
Common: spineless yucca, giant yucca, elephant foot yucca
Family: Asparagaceae (subfamily Agavoideae)
Origin: central America

Pronounciation: YUK-ka gu-a-te-mal-EN-sis

Hardiness zones
USDA 9-11

Landscape Use: Accent, focal point, Spanish architecture, tropical to subtropical, parks and large greens spaces, classic large mesic yucca.

Form & Character: Strongly upright and arborescent, trunk tapers broadly at ground level.

Growth Habit: Evergreen woody perennial, moderately upright to 10 to 30 feet, multiple trunk, basally branching.

Foliage/texture: Strap-like medium green leaves, 2.5 feet long by 2 to 3 inches wide, tapering to a sharp tip, somewhat bendable, loosely set on stems; coarse texture.

Flowers & fruits: Panicles of white flowers followed by 6-ribbed fruits.

Seasonal color: Cream white flowers in early summer.

Temperature: Hardy to 20oF

Light: Partial to full sun.

Soil: Tolerant

Watering: Only somewhat drought tolerant, looks best with regular water.

Pruning: Remove old leaves and/or unwanted basal branches.

Propagation: Mosly stem cutting root fast by merely sticking a large stem segment into the ground outdoors.

Disease and pests: Spider mites

Additional comments: This is a VERY LARGE mesic yucca that I think is rather poorly suited for Phoenix landscape settings (it rarely looks unstressed). Don't over estimate it's ultimate size, even in Phoenix where it's eventual size is smaller than in more tropical climates.