Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Silver torch or Wooly torch cactus (Cleistocactus strausii) is a succulent of family Cactaceae. It is native to high mountain regions of Bolivia and Argentina. Its slender, erect, grey-green columns can reach a height of 3 m (10 ft), but are only about 6 cm (2.5 in) across. The columns are formed from around 25 ribs and are densely covered with areoles, supporting four yellow-brown spines up to 4 cm (2 in) 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.

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