Astrophytum ornatum (Monk's hood). Sunset: 11-13,18-21; USDA: 9b-10. Light shade in hottest locations. Heat tolerant. Little water. Hardy to 20°F. Solitary barrel grows to 4' tall; 10" in diameter. Origin: Mexico.

Echinocactus grusonii (Golden barrel cacti). Sunset: 11-24; USDA: 9-12. Full sun. Regular water summer. Hardy to 24°F. Grows slowly 3' tall; 4' wide. Yellow flowers.  Origin: Mexico

Echinocactus texensis (Horse Crippler). Sunset: 10-13; USDA: 5-11. Hardy to 0° F.  Full sun to light shade in hot gardens. Light summer water, dry winter. Solitary when young, slowly clustering, 12" in diameter, 8" high. Pink flowers. Origin: Texas, southeastern New Mexico, northeastern Mexico.

Ferocactus covillei. Sunset: 8-24; USDA: 9-10. Full sun. Heat tolerant. Little or no water. Hardy to 25°F. Solitary barrel grows to 3 tall; 3' diameter. Native to Mexico.

Ferocactus glaucescens (Blue barrel) USDA: 9b-11. Full sun to light shade. Heat tolerant. Little or no water. Hardy to 28°F. Solitary barrel grows to 2.5' tall; 18" diameter. Origin: Eastern central Mexico.

Ferocactus hamatacanthus ssp. sinuatus (aka Echinocactus hamatacanthus) USDA: 8b-11. Full sun. Heat tolerant. Little or no water. Hardy to 16°F. Grows to 2' cluster. Native Texas, Mexico

Ferocactus herrerae (USDA: 9-11). Full sun. Heat tolerant. Little or no water. Hardy to 20°F. Solitary barrel grows to 6' tall; 16" diameter. Orange to red flowers, large yellow fruit. Origin: Mexico

Ferocactus wislizenii (Fishhook barrel). Sunset: 8-24; USDA: 9-11. Full sun. Heat tolerant. Little or no water. Hardy to 5°F. Solitary barrel grows to 6' tall; 2' diameter. Native to Arizona, northern Mexico.