Cactus
Cardon
Pachycereus pringlei · Cactaceae
Also called: Mexican Giant Cardon, Elephant Cactus, Sahueso, Cardon Gigante
Cardon (Pachycereus pringlei) is a very low-water cactus well suited to Tucson and the low desert. It thrives in full sun.
Cardon at a glance
- Water use
- Very Low (established)
- Sun
- Full sun; needs maximum heat and light.
- Mature size
- Up to 30-60 ft H x 10-20 ft W over many decades; massive multi-branched columnar habit, the world's largest cactus. In Tucson landscapes typically seen at 6-20 ft.
- Growth rate
- Slow (faster than saguaro when young, but still a multi-decade plant)
- Bloom
- White to creamy-white, with flowers opening at night and remaining open into morning, Spring (March-May); produces large spiny fruit with edible red pulp
- Cold hardiness
- Frost-sensitive; tolerates brief dips to about 25 F but new growth and young plants damage easily below freezing. USDA zones 9b-11. Less cold-hardy than saguaro, which is why it does not occur naturally in Arizona; protect from hard Tucson winter freezes.
- Soil
- Fast-draining gravelly, sandy, or rocky soils; highly intolerant of standing water and heavy clay. Plant on a mound or slope to ensure drainage.
- Native range
- Native to northwestern Mexico: Baja California, Baja California Sur, and Sonora. Not native to Arizona/the U.S., though grown ornamentally in Tucson.
- Best used as
- Bold architectural specimen, Focal point in xeriscape and desert-modern designs, Large-scale commercial and estate landscapes
- Wildlife
- Flowers pollinated by bats, birds, and insects; fruit eaten by birds, bats, and mammals. Hosts nesting birds in mature arms; notable nitrogen-fixing bacterial symbiosis lets it colonize bare rock.
- Toxicity
- Not toxic; hazard is mechanical from stout spines. Fruit pulp and seeds are edible and were a traditional Seri food.
How to grow Cardon in Tucson & the low desert
Watering
Drought tolerant once established; water deeply but infrequently (about monthly) in summer to encourage faster growth, and withhold water in winter to maximize cold hardiness and prevent rot.
Fertilizer & nutrients
Light feeding benefits younger plants: a dilute, low-nitrogen cactus fertilizer once in spring and once in early summer speeds establishment. Mature specimens need little to none. Avoid high nitrogen, which weakens cold tolerance.
Pruning & care
None required and not desirable; the columnar form is the feature. Remove only freeze-damaged or diseased tissue. Large specimens may need staking/support when transplanted.
Notes
Frequently confused with saguaro but distinguished by branching low on a distinct trunk, more numerous ribs, and white spring flowers borne along the stems rather than only at tips. A dramatic but frost-tender choice for Tucson; site in a warm microclimate with overhead protection and excellent drainage.
Sources: University of Arizona Cooperative Extension; Arizona-Sonora Desert Museum; Desert Botanical Garden; iNaturalist / regional cactus references