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.
Beautiful demoiselle
But natural waters with low water pollution can be in a state of the animals is not available. He may receive a water surface is not completely from the plants of the marginal vegetation to be overgrown, this is done mainly by fast-growing plants such as Meadowsweet ("Filipendula ulmaria"), the stinging nettle ("Urtica dioica") or Himalayan balsam ( Impatiens glandulifera ). The tree growth on the waters edge should not report closed canopy, otherwise lack the necessary sunlight.
Above all streams in uncultivated pastures, where no regular mowing is taking place, according to the animals are not habitable. This can be countered by regular removal of boundary vegetation, which will also not be complete. Even a partial thinning of trees and shrubs should be performed. In intensively used agricultural areas with a regular input of manure as fertilizer is a few meters wide can prevent extensive or unmanaged riparian strips one Einschwemmung and thus act against eutrophication.