Trichocereus terscheckii (Argentine Saguaro) — A South American giant standing like a sentinel.

Often mistaken for the true saguaro, the Argentine Saguaro is equally impressive, with tall ribbed columns and huge white blooms. Faster-growing and more cold-tolerant than its Arizona cousin.

Plant Details:

• Water Needs: Very low; occasional deep watering

• Sun Needs: Full sun

• Soil Requirements: Well-drained sandy or rocky soils

• Growing Zone: USDA Zones 8–11

• Cold Hardiness: Down to ~10°F (–12°C)

• Mature Size: 15–30 ft tall x 6–10 ft wide

• Native Origin: Argentina

• Best Substitutes For: Saguaro, Organ Pipe Cactus

• Landscape Uses: Specimen plantings, dramatic desert accents