In nature it grows near Tula, a small town in the state of Tamaulipas in Mexico, and from its origin derives the name of the species. It is a cactus generally solitary with the globose stem of bluish-green color, which can lengthen and reach about 25 cm in height. The variegated shape of this cactus presents the typical lighter areas in the exact points where the chlorophyll is absent: these characteristics will never be the same from one plant to another, therefore each exemplar will be absolutely unique and, for this reason, highly sought after by collectors. From the pronounced tubercles the spines come out: the radial ones are short of grey color, whilst the central ones are longer and can assume a reddish colouration, especially at the apex of the stem. At the beginning of summer its beautiful flowers bloom in shades of white and pink, enriched by a characteristic darker central strip.