Plant name: Old man cactus, Old man of Mexico, Cabeza de viejo
Botanical name: Cephalocereus senilis
Recommended Temperature Zone: USDA 9-10
Frost Tolerance: Hardy to 14°F (-10°C) for short periods
Minimum Avg. Temperature: 50°F (10°C)
Heat Tolerance: Prefers some afternoon shade in the low deserts
Sun Exposure: Full sun
Origin: Mexico (Hidalgo, Guanajuato)
Growth Habits: Slow growing to a large column, seldom ramified, 45 feet tall (11 m) by 18 inches (45 cm) in diameter; 12 to 30 ribs; 1 to 5 central spines, up to 2 inches long (5 cm); 20 to 30 hair-like laterals.
Watering Needs: Little to moderate water in summer, almost none in winter, very rot prone particularly when young, needs good drainage
Propagation: Seeds, cuttings
Information courtesy of desert-tropicals.com. Image courtesy of United States Botanic Garden.