Soehrensia spachiana, commonly known as the golden torch, (white) torch cactus or golden column, is a species of cactus native to South America. Previously known as Trichocereus spachianus for many years, it is commonly cultivated as a pot or rockery plant worldwide. It has a columnar habit, with a lime-green cylindrical body with 1–2 cm long golden spines.
Soehrensia spachiana grows as a cactus with a columnar habit, reaching 2 m (7 ft) high, with a diameter of 5–6 cm (2–2+1⁄4 in).[2] Vertical branches arise from the base of the plant.[3] Each column has 10–15 rounded ribs. The large areoles are around 1 cm apart, and have wavy yellow hairs. The straight spines are red-yellow initially, fading to white as they age. The central spine is around 1–2 cm (1⁄2–3⁄4 in) long, and is surrounded by 8 to 10 smaller radial spines that are 0.4–1 cm (1⁄4–1⁄2 in) in length. The white flowers are 15 cm (6 in) across and 18–20 cm (7–7+3⁄4 in) long,[2] part of which is an 8 cm long tube. In the northern hemisphere, the flowers appear in June–July and open at night.
Soehrensia spachiana is native to western Argentina around Icaño and Santiago del Estero province and Bolivia. It is a declared weed in South Africa.
