Grass · Sonoran native
Big Galleta
Hilaria rigida · Poaceae
Also called: Galleta, Toboso (regional)
Big Galleta (Hilaria rigida) is a very low-water grass native to the Sonoran Desert region well suited to Tucson and the low desert. It grows to 2-3 ft H x 2-4 ft W in full sun.
Big Galleta at a glance
- Water use
- Very Low (established)
- Sun
- Full sun; requires high heat and intense sun.
- Mature size
- 2-3 ft H x 2-4 ft W
- Growth rate
- Slow to moderate; long-lived, coarse warm-season grass that spreads by stout rhizomes.
- Bloom
- Whitish to straw-colored, somewhat zigzag spike-like flower heads; not showy but textural. Foliage is gray-green, becoming wiry and pale when dry., Spring and summer, responsive to monsoon rains (Mar-September).
- Cold hardiness
- Cold hardy to about 5-10 F; roughly USDA zones 8-11. Hardy in Tucson; a true desert heat lover.
- Soil
- Prefers sandy, gravelly, and rocky well-drained desert soils; excellent on dunes and slopes. Intolerant of poorly drained or heavy wet soils.
- Native range
- Native to the Sonoran, Mojave, and Chihuahuan deserts of the southwestern U.S. and northern Mexico, including Arizona; common on sandy flats, dunes, and rocky desert slopes.
- Best used as
- Revegetation and erosion control on sandy slopes and dunes, Desert restoration plantings, Tough naturalistic grass for hot exposed sites, Forage on rangeland
- Wildlife
- Important desert forage and cover; provides habitat and food for desert wildlife including birds and small mammals; stabilizes dune and slope habitat.
- Toxicity
- Non-toxic; coarse forage grass.
How to grow Big Galleta in Tucson & the low desert
Watering
Among the most drought-tolerant native grasses; survives entirely on rainfall once established. Little to no supplemental irrigation needed; occasional deep summer water keeps it greener. Avoid overwatering.
Fertilizer & nutrients
None needed; adapted to extremely lean desert soils and requires no fertilization.
Pruning & care
Minimal; remove old dead growth as needed in late winter. Coarse and woody at the base, so it can be cut back hard occasionally to renew.
Notes
Accepted name is Hilaria rigida (synonym Pleuraphis rigida, used by some floras). A rugged, sprawling, rhizomatous grass for the harshest, hottest, driest sites where little else grows. Best used in restoration and very-low-water naturalistic plantings rather than refined ornamental beds.
Sources: University of Arizona Cooperative Extension; Arizona-Sonora Desert Museum; USDA NRCS Plant Guide (Pleuraphis rigida); Calscape / Jepson