This beautiful succulent is in some respects similar to a cactacea, from which however it already differs at first sight for the inflorescences. It has columnar stems of a nice light green during the growth phase, which tends to become bluish-gray later on; it is equipped with slightly marked and narrow longitudinal ribs, from which long continuous lines of pointed tubercles, similar to thorns, branch off. It is the largest species of the genus, which in nature can reach up to two meters in height, becoming a real tree with very few branches but with a great visual impact. Its charm is amplified when flashy clusters of abundant yellow-orange flowers bloom at the apex. Fun fact: this species was used in the past to reduce the sense of hunger and thirst during hunting trips and still today, in some alternative medicines, it is used as a supplement with slimming properties!