Silver Torch Cactus

Scientific Name: Cleistocactus strausii (Heese) Backeb.
Synonym: Borzicactus strausii, Cereus strausii, Denmoza strausii, Pilocereus strausii
Family: Cactaceae

Recommended Temperature Zone:
USDA: 9-10

Frost Tolerance: Hardy to 14°F (-10°C), but the tips might get damaged below 23°F (-5°C)

Sun Exposure: Full sun to light shade

Origin: Bolivia, Argentina

Growth Habits: Succulent, grow in group of slender columns up to 8 feet tall (2.4 m), or more, 2.5 inches in diameter (6 cm); about 25 ribs; 4 longer central spines, up to 1.6 inches long (4 cm); over 20 radials

Watering Needs: Water generously during the summer, keep dry in winter, root prone

Propagation: Seeds (cuttings will generally not root)

Cleistocactus strausii is a columnar Cleistocactus. Another popular Cleistocactus, it is one of the hardiest.

Blooming Habits:
The silver torch starts blooming when the columns are 18 inches tall (45 cm). They bloom freely in cultivation. The 3-inches long flowers are deep burgundy, they protrude horizontally from the side of the columns near the tips.

Culture:
The Cleistocactus is a vigorous plant, repot it yearly with a loam based mixture, and give an occasional high potassium liquid feed.