Cleistocactus strausii
As a houseplant, the Silver Torch cactus is an easy to take care of so long as over-watering is avoided. To naturally simulate the porous effects of the sand in its native habitat, it's important to ensure that excess water will not pool in the soil, causing the roots to become water logged.
This plant’s native habitat does not have winter, but when temperatures drop to the low twenties, it can exhibit signs of tip frost. 
The Silver Torch cactus is most susceptible to 
mealybugs 
and spider mite.
Hydrozoning
As you move farther away from the water source your plantings require less water. For example, drought tolerant plants such as sage or cactus would not be planted in a bluegrass lawn, but would be separated, since bluegrass has a higher water requirement.