[worldofsucculents.com] Origin, South America native, Description: Origin The native range of this species is from Bolivia to western Argentina. Description Echinopsis spachiana, formerly known as Trichocereus spachianus, is a slow-growing columnar cactus with cylindrical stems with 10 to 15 ribs lined with large woolly areoles, out of which grow clusters of spines. The stems grow up to 6.6 feet (2 m) tall and 2.4 inches (6 cm) in diameter, branching at the base. Areoles are about 0.4 inches (1 cm) apart and covered with curly yellow wool that turns white or grey as they age. The straight spines are reddish-yellow initially, fading to gray as they age. Each areole bears 8 to 10 radial and 1 to 3 longer central spines. The up to 0.5 inches (1.2 cm) long central spines are surrounded by up to 0.4 inches (1 cm) long radial spines. Flowers are white, funnel-shaped, up to 6 inches (15 cm) in diameter, and up to 8 inches (20 cm) long. They appear in spring and open at night. (link added by Mary Ann Machi)