Acanthocalycium brevispinum

Acanthocalycium catamarcense. Sunset: 16,17,21-24; USDA: 10-12.  Full sun in cooler gardens, partial shade elsewhere. Frost tolerance: 15° F. Usually solitary gowth to 5" tall, 4" diameter. Yellow, red or white flowers. Origin: Argentina

Acanthocalycium ferrari. USDA: 8b-11. Frost hardy to 10° F for short durations. Growth Habits: Usually solitary growth to 8" tall, 5" diameter. Summer, regular water; winter little to no water. Yellow or orange flowers, up to 2" diameter. Origin: Argentina.

Acanthocalycium glaucum

Acanthocalycium klimpelianum. USDA: 8-10. Frost hardy to 10° F for short durations. Usually solitary growth to 4" tall, 4" diameter. Summer, regular water; winter little to no water. Full sun to light shade. Large flowers. Origin: Northern Argentina.

Acanthocalycium peitscherianum

Acanthocalycium species mix. A mix of several varieties.

Acanthocalycium spiniflorum

Acanthocalycium spiniflorum var. macranthum - El Alto / Catamarca Argentina

Acanthocalycium thionanthum

Acanthocalycium variiflorum

Acanthocalycium violaceum. (Syn: Acanthocalycium spiniflorum "violaceum") USDA: 8-10. Frost hardy to 25F. Solitary to clumping growth, up to 2' tall, 6" diameter. Regular water summer; winter keep dry. Full sun to light shade. white to violet flowers. Origin: Banos de Zapallar /San Luis Argentina.

Acanthocalycium violaceum var. (Deep violet flower color)
 San Javier / Cordoba Argentina

Acanthorhipsalis monacantha

Acanthorhipsalis monacantha v. samaipatana

Acharagma aguirreana

Acharagma roseanum

Akersia roseiflora (Syn: Cleistocactus samaipatanus)

Ancistrocactus brevihamatus

Ancistrocactus megarhizus

Ancistrocactus scheeri (Syn. Sclerocactus scheeri) Hardy to 25° F. Full sun to light shade. Solitary columnar or globose up to 6" tall, 4" in diameter. Moderate water spring and summer, no water in winter. Greenish flowers. Origin: Southern Texas, Mexico.

Arequipa erectocylindrica (syn. Oreocereus hempelianus). USDA: 8-10. Hardy to 10° F for short periods. Full sun to light shade, needs protection in hottest desert gardens. Columnar cactus usually clustering, up to 18" tall. Moderate water spring and summer, no water in winter. Tubular red flowers. Attracts hummingbirds. Origin: Peru and Chile, Andes mountains above 5000 ft.

Ariocarpus agavoides (Living rock cactus). USDA: 10-11. Hardy to 26° F. Full sun to light shade, needs protection in hottest desert gardens. Rosette shaped spineless succulent, up to 3" in diameter. Moderate water summer, no water in winter. Magenta flowers, 1.5 inches in diameter. Origin: Mexico. Endangered plant.

Ariocarpus bravoanus

Ariocarpus confusus

Ariocarpus fissuratus (Living rock/ False Peyote). Sunset: 11-13; USDA: 8b-11. Hardy to 25° F. Full sun to light shade, needs protection in hottest desert gardens. Solitary spineless, grows very slowly to 8" in diameter. Little water summer, no water in winter. Pink to Magenta flowers, 1.5 inches in diameter. Origin: Texas, New Mexico and Northern Mexico.

Ariocarpus furfuraceus

Ariocarpus kotschoubeyanus

Ariocarpus retusus (Seven stars). Sunset: 11,13; USDA: 9b-11. Hardy to 27° F. Full sun to light shade, needs protection in hottest desert gardens. Solitary spineless, slowly growing up to 10" in diameter. Little water summer, no water in winter. White flowers with pink stripe in center, 2" in diameter. Origin: Mexico.

Ariocarpus retusus v. pectinatus