From Encyclopedia of Medicinal Plants
Its slender, erect, grey-green columns can reach a height of Template:Convert, but are only about Template:Convert across. The columns are formed from around 25 ribs and are densely covered with areoles, supporting four yellow-brown spines up to Template:Convert long and 20 shorter white radials.
The cactus prefers free draining soils, strong sunlight, but not high temperatures — in fact it can withstand hard frosts down to -10 °C. In its natural habitat it receives plenty of water during the summer, but almost none over the winter. In cultivation, watering too much in winter often leads to root rot.
Older cactuses, over Template:Convert tall, produce deep red, burgundy, flowers in late summer. The Template:Convert long cylindrical flowers protrude 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. In the United Kingdom, this plant is usually grown under glass, and has gained the Royal Horticultural Society's Award of Garden Merit.<ref>Template:Cite web</ref>
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