Miniature Barrel Cactus

Scientific Name: Thelocactus setispinus (Engelm.) E.F.Anderson
Synonym: Echinocactus hamatus, Echinocactus muehlenpfordtii, Echinocactus setispinus, Echinocactus setispinus var. setaceus , Echinocactus setispinus var. muehlenpfordtii , Echinocactus setispinus var. mierensis , Echinocactus setispinus var. cachetianus , Ferocactus setispinus, Hamatocactus setispinus var. cachetianus , Hamatocactus setispinus var. setaceus , Hamatocactus setispinus var. hamatus , Hamatocactus setispinus, Thelocactus setispinus var. mierensis , Thelocactus setispinus var. hamatus , Thelocactus setispinus var. cachetianus , Thelocactus setispinus, Thelocactus setispinus var. setaceus
Family: Cactaceae

Recommended Temperature Zone:
USDA: 9-11

Frost Tolerance: Hardy to 10-20°F depending on the origin (-12 to -7°C)

Heat Tolerance: Do better with some shade in summer in Phoenix

Sun Exposure: Full sun to light shade

Origin: USA (south Texas), Mexico (Coahuila, Nuevo Leon, Tamaulipas)

Growth Habits: Solitary or slowly offsetting, up to 6 inches tall (15 cm), 4 inches in diameter (10 cm); around 13 high wavy ribs; areoles 0.4 to 0.5 inch long, with short wool; 1 to 3 central spines; 12 to 16 radials, white or brown, up to 1.6 inches long (4 cm)

There are a number of forms with flower color varying from brilliant violet to carmine red.

Blooming Habits:
Yellow flowers with darker centers, 1.5 inches across (4 cm), 1.6 to 2.8 inches long (4-7 cm). The fruit is red, oval, 0.3 to 0.4 inch long (8-11 mm)