毛柱屬的樹形仙人掌，原產巴西。樹高1~10m，較易從基部分枝；莖直徑5~10cm，外皮藍綠色至天藍色，有白粉，5~19條稜；刺座有白色髮狀的毛，中刺1~2支、側刺8~18支。開花部位的棉毛特別發達。花白色，直徑2~4.5cm。夏季開花。

A tree-shaped cactus of the genus Pilosocereus, native to Brazil. It reaches 1 - 10 m tall, and often bifurcates from the base; stem 5 - 10 cm in diameter, outer bluish green to sky blue, covered with white powder, 5 - 19 ridges. The areoles bear 1 - 2 central spines and 8 - 18 radials. Cotton wool grown in the flowering area is particularly well-developed. Flowers white, 2 - 4.5 cm in diameter. Bloom in summer.

栽培：全日照通風環境下可生長良好，日照充足時莖的顏色會更鮮明。為了防止爛根等情形，需採用排水透氣且微酸性的介質。高溫生長期，觀察介質乾就澆水；低溫期休眠，應控制澆水。

It grows well under full sunlight and ventilation; sufficient sunlight will make the stem color more distinctive. Plant in well-draining, breathable and slightly acidic soil to avoid root rotting. A summer grower, water once the soil appears dry and control water use when it’s dormant in winters.

素以莖的藍色色澤聞名，會在強烈日曬以及較大溫差下產生漂亮的藍色光澤。適合單莖盆植或多莖叢植以增加觀賞效果。露地栽培避免種於路旁等空氣品質較差的位置，以免污染物弄髒棉毛與外皮。

It’s well-known for the blue-colored stem which emits a fascinating blue luster under strong sunlight and large temperature differences. Suitable to plant along in pots, clustered planting is more ornamental. For open field cultivation,do not in places with poor air quality, like roadsides, so as not to stain the cotton wool and outer skin with pollutants.