No synonyms are recorded.

Agave potatorum ‘Shoji-Raijin’ is a nursery cultivar of Japanese origin. The parent species, Agave potatorum, is native to southern Mexico, particularly the states of Oaxaca and Puebla, where it grows at elevations of approximately 3,900 to 6,600 feet (1,200–2,000 meters) on rocky slopes and in well-drained, often calcareous soils, within arid and semi-arid environments.

The genus name Agave derives from the Greek agauós, meaning “noble” or “admirable”, referring to the plant’s majestic appearance and its striking candelabra-like inflorescence. The specific epithet potatorum, from Latin, means “of the drinkers” and alludes to the traditional use of some species within the genus for the production of alcoholic beverages. The cultivar name ‘Shoji-Raijin’ is of Japanese origin: “shōji” refers to the traditional sliding paper-and-wood screen, while “Raijin” is the god of thunder in Japanese mythology. The expression can therefore be interpreted as “the thunder god appearing behind a shōji,” symbolically evoking intense energy contained within a harmonious and symmetrical rosette.

This plant belongs to the genus Agave and to the family Asparagaceae. It is a dwarf cultivar selected for its compact and symmetrical growth habit. It grows slowly, forming small rosettes generally ranging from 2.5 to 5 inches (6–12 cm) in diameter, which remain well-suited to 4-inch (10 cm) pots for a long time. With age, it tends to produce basal offsets, developing small clumps composed of closely clustered rosettes. The leaves are broad, thick and fleshy, very rigid to the touch, and oblong-triangular in shape. The surface is covered with a fine powdery bloom that gives the characteristic dusty blue or glaucous green coloration. The margins are slightly undulating and bear a few short, dark marginal spines, while the tip ends in a distinctive reddish terminal spine, well pronounced and often slightly twisted.

Flowering is a rare event in cultivation, especially in specimens grown in containers. Like the species from which it derives, it is a monocarpic plant, flowering only once at the end of its life cycle. When this occurs, after many years of growth, it produces an upright flower stalk that branches in the upper portion and bears numerous tubular yellowish-green flowers arranged in a panicle inflorescence. Fruit formation, consisting of capsules containing flattened black seeds, is also uncommon.

This is a generally undemanding cultivar, characterized by a slow growth rate.

It prefers a light, highly well-draining substrate, which is essential to prevent water stagnation at the root level. An ideal mix is predominantly mineral, loose and well aerated, composed of inert materials such as pumice, lava rock or coarse sand, enriched with a modest organic component.

Water moderately and only when the soil is completely dry. During the growing season, watering may be more regular, always avoiding waterlogging and allowing the substrate to dry thoroughly between applications. In fall and winter, occasional watering is sufficient, just enough to prevent excessive dehydration.

It grows best in very bright positions, in full sun or light shade. However, during the summer months, especially in hotter climates, light shading during the hottest part of the day is advisable. During the growing season it appreciates mild to warm temperatures, while in winter it prefers cooler conditions and can tolerate brief drops to about 25°F (−4°C) if kept dry and protected from cold winds and prolonged rainfall.

During the first years of growth, a light feeding in spring may be beneficial, preferably with a balanced, low-nitrogen fertilizer. Mature specimens generally remain vigorous with minimal feeding. Fertilization should be suspended in fall and winter, during the plant’s dormant period.

Repotting may be carried out when the plant becomes root-bound. It is best done at the beginning of the growing season, choosing a container only slightly larger than the previous one and filling it with fresh, well-draining soil. After repotting, it is advisable to wait about a week before resuming watering.

It is not considered a particularly toxic plant. Like other agaves, it contains sap that may cause mild skin irritation in sensitive individuals. Care should also be taken with its rigid, pointed spines, especially during propagation and repotting.

It is generally a hardy and resilient plant. The most common issue is root or crown rot, usually caused by excess moisture or poor drainage. It may occasionally be affected by mealybugs or aphids, which tend to hide between the leaves or at the base of the rosette, particularly in poorly ventilated conditions.

Care tip: ensure that water does not collect in the center of the rosette or between the leaves, as the particularly dense and compact structure can retain moisture and encourage rot.

The plant is propagated exclusively by vegetative means, through the separation of basal offsets that develop as it matures. Offsets can be removed once they have formed a sufficient root system, allowing the cut surface to dry before placing them in a light, well-draining substrate.

This cultivar is also known as “Silver Star” for its elegant symmetry, or “Blue Rose” for the arrangement of its leaves, which resembles that of a rose.