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Giant Hesperaloe
Hesperaloe funifera · Asparagaceae (Agavoideae)
Also called: Coahuilan Hesperaloe, New Mexico False Yucca, Giant False Yucca
Giant Hesperaloe (Hesperaloe funifera) is a very low-water accent well suited to Tucson and the low desert.
Giant Hesperaloe at a glance
- Water use
- Very Low (established)
- Sun
- Full sun, including reflected heat; tolerates light shade but is more open and floppy with less sun.
- Mature size
- 4-6 ft H x 4-6 ft W as a clump; flower stalks 8-15 ft tall.
- Growth rate
- Moderate; faster with occasional deep irrigation and well-drained soil.
- Bloom
- Greenish-white to creamy white (occasionally pinkish-tinged), borne on tall branched stalks., Late spring through summer (roughly May-September), blooming sporadically over a long period; flowers open at night/early morning.
- Cold hardiness
- Hardy to about 10°F (some references to 0°F); USDA zones 8-11. Reliably root- and crown-hardy throughout the Tucson basin.
- Soil
- Adaptable; prefers well-drained sandy or rocky desert soils but tolerates heavier clay and caliche if not overwatered. Tolerant of alkaline soils.
- Native range
- Chihuahuan Desert of northeastern Mexico (Coahuila, Nuevo Leon, Tamaulipas) and adjacent southern Texas; not native to Arizona/Sonoran Desert but extremely well adapted to the Tucson low desert.
- Best used as
- Bold architectural accent, Specimen/focal point, Median and parking-lot/commercial plantings, Reflected-heat western and southern exposures, Low-maintenance xeriscape, Background or screening mass
- Wildlife
- Flowers are visited by hummingbirds, native bees, and other pollinators; seed and nectar provide some wildlife value. Generally rabbit- and javelina-resistant.
- Toxicity
- Not considered significantly toxic; like other agave-family plants it contains saponins and the stiff, fiber-margined leaves end in sharp tips that can injure people and pets, so site away from walkways.
How to grow Giant Hesperaloe in Tucson & the low desert
Watering
Drought tolerant once established; keep on its own low-volume drip emitter and water deeply every 3-4 weeks in summer, monthly or less in spring/fall, and withhold supplemental water in winter. Deep infrequent irrigation produces a fuller plant and more bloom without overgrowth.
Fertilizer & nutrients
Essentially none required in desert soils. An optional light application of a balanced or slow-release fertilizer in spring can speed growth on young plants, but mature clumps thrive on lean soil without feeding.
Pruning & care
Very low maintenance; no shearing. Remove spent flower stalks at the base after bloom and trim any dead or frost-damaged outer leaves. Do not cut into the live crown.
Notes
Distinguished from red yucca (Hesperaloe parviflora) by its much larger, stiff, upright lime-green leaves with conspicuous curling white marginal fibers ('funifera' = thread-bearing) and taller, greenish-white flower stalks. Stemless clumping rosette. Because of its size and sharp leaf tips, give it room and keep it back from sidewalks and patios.
Sources: AMWUA – Landscape Plants for the Arizona Desert (Giant Hesperaloe profile); Arizona-Sonora Desert Museum plant care sheet (Hesperaloe); University of Arizona Cooperative Extension / Pima County desert landscaping guides; Water Use It Wisely (AMWUA partner)