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''Cleistocactus strausii'' (silver torch or wooly torch) is a perennial cactus of the family Cactaceae. It is native to high mountain regions of Bolivia and Argentina, above . Its slender, erect, grey-green columns can reach a height of , but are only about across. The columns are formed from around 25 ribs and are densely covered with areoles, supporting four yellow-brown spines up to 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 tall, produce deep red, burgundy, flowers in late summer. The 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. Image:Cleistocactus strausii2.jpg|When mature, the silver torch cactus produces red flowers extending horizontally from the main columns. File:Flowers by silver torch cactus.jpg|Flowers by silver torch cactus File:Cleistocactus strausii Cacti.JPG|Young cacti columns ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cleistocactus strausii」の詳細全文を読む スポンサード リンク
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