Cleistocactus winteri
Native range: Bolivia
Known names: Golden Rat Tail Cactus
Hardiness: Can handle freezing once in a while as long as kept dry
Mature Size: 30"+ "whips", ~1" thick 
Light: Full sun, Mostly sun
Water: Summer water, keep on the dryer side in winter. 
Soil: Fast draining, succulent mix
Dormancy Period: Winter
Pet-Safe: No
Plant Size: Grown in 2.5" pot
 
Orange flowers in late spring/early summer. Grows downward in a vine-like formation! Forms offshoots once in a while