Cleistocactus hyalacanthus, commonly known as Silver Torch or Wooly Torch, is a columnar cactus species that typically grows as a shrub with erect shoots. It can reach up to 3.3 feet tall and has a diameter of 1.6 to 2.4 inches. This cactus is native to high-altitude mountainous regions, specifically the dry valleys and slopes of the Andes in Argentina and possibly extending into southern Bolivia. It is accustomed to growing at altitudes of 4,900 to 11,500 feet where it thrives in rocky soils with good drainage.

The Silver Torch cactus is notable for its striking appearance, with brown to yellowish central spines and dense whitish radial spines that give it a silvery look. It produces vivid red, tubular flowers that are particularly attractive to hummingbirds, followed by light greenish to brick-red fruits with white flesh. The flowering season typically occurs in late summer to fall, and the flowers are considered quite showy. In cultivation, this cactus is valued for its unique form and the contrast it provides in rock gardens, cactus collections, and as a potted specimen. It requires minimal maintenance, being drought-tolerant and needing only occasional watering. The Silver Torch prefers full sun and well-draining soil, making it suitable for xeriscaping. While generally disease-resistant, it can be susceptible to root rot if overwatered. It is not known to be invasive when grown outside its native range.CC BY-SA 4.0