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The Silver torch cactus is a columnar cactus native to high mountain regions of Bolivia and Argentina. The grey-green columns can grow to a height of 3 m (10 ft) and are densely covered with 4 cm (2 in) long spines. In late summer, the Silver torch produces burgundy flowers which protude horizontally from the columns. In common with other cacti in the genus Cleistocactus, the flowers hardly open, with only the style and stamens protruding. Cultivated plants often flower freely. Photo credit: Raul654 |