Клейстокактус Штрауса: Описание и уход

Species of cactus

Cleistocactus strausii, the silver torch or wooly torch, is a perennial flowering plant in the family Cactaceae. It is native to mountainous regions of Department Tarija, Bolivia, at .

Cleistocactus strausii grows as a shrub, slender, erect, branches out from the base with several upright, with gray green columns growing up to tall, but only about across, which are covered in white spines. The light green shoots reach a diameter of up to 8 cm (3.1 in) and are completely covered by dense, white spines. There are 25 to 30 ribs and are densely covered with areoles, supporting four yellow brown spines up to long and 20 shorter white radials. The approximately 4 central spines are light yellow and up to 2 centimeters long. The 30 to 40 white radial spines are hairy to bristly and 1.5 to 5 centimeters long. Older cacti, over tall, produce tubular flowers in late summer. They are deep red to burgundy and grow up to long cylindrical flowers protrude horizontally and radially from the stem of the cactus. The flower tube is very densely covered with silky hairs. The pear to spherical, red fruits reach a diameter of up to 2 centimeters. In common with other cacti in the genus Cleistocactus, the flowers hardly open, with only the style and stamens protruding.

Cleistocactus strausii prefers mountainous regions that are dry and semi arid. Like other cacti and succulents, it thrives in porous soil and full sun. While partial sunlight is the minimum requirement for survival, full sunlight for several hours a day is required for the silver torch cactus to bloom flowers. Silver torch cacti can thrive in low nitrogen soils without facing the consequences. Too much water will make the plants weak and lead to root rot.

This cactus is locally abundant in its native land and has few local threats to its survival, so it is rated Least Concern.

The silver torch cactus is most susceptible to mealybugs and spider mite. Mealybugs are among the most common pests of cacti and succulents. They can be identified by their white, cottony masses on the plant. These are signs that the bugs are reproducing. These pests are especially problematic because they suck out plant sap, depleting the strength of the plant. They can also cause sooty mold along with their fluffy white wax, detracting from the plants' appearance. Another form of mealybug attacks the root system of plants, which is harder to detect. Mites thrive in the same hot, dry conditions that the silver torch cactus lives in. Spider mites cause damage by sucking out vital nutrients from the plant. Large populations of mites can cause irreversible damage, eventually killing the plant. However, both pests can be hosed off with water.