flowering silver torch cactus (cleistocactus strausii) in garden

plant cactus flower thorns leaf garden green nature arid bloom blooming botanical botany branch cactaceae cacti cactus cleistocactus cleistocactus strausii cultivate decorative desert drought resistant dry environment flora flower fluted garden green ground hairy horticulture hot landscape nature ornamental petal pistil plant prickly red ribbed scoria sharp silver torch springtime stem stone succulent summer woolly autumn blossom spike spine