Arizona Rainbow Hedgehog Cactus, Cabeza de Viejo
Scientific Name: Echinocereus rigidissimus (Engelm.) Rose
Synonym: Cereus pectinatus v. rigidissimus, Echinocereus pectinatus v. rigidissimus
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Echinocereus rigidissimus var. rubispinus 'Ruby Rainbow'
Recommended Temperature Zone:|
Frost Tolerance: Hardy to 23° F (-5°C)
Minimum Avg. Temperature: 50°F (10°C)
Sun Exposure: Full sun to light shade
Origin: USA (southeastern Arizona, southwestern New Mexico), Mexico (northern Sonora, northwestern Chihuahua)
Growth Habits: Solitary, up to 8 inches tall (20 cm), 1.6 to 4 inches wide (4-10 cm), 16-22 ribs; no central spines; 16 to 22 stiff pectinate radials, grey to reddish brown, close to the stem, 0.6 inch long (15 mm)
Watering Needs: Rot easily, needs good drainage to avoid rotting
Mature plants with a good light will generally have red to deep pink spines.
Intense pink flowers with much lighter throat, 2.4 to 2.8 inches long (6-7 cm), up to 3.6 inches in diameter (9 cm). It blooms in May. The globose fruits are very spiny, 1.2 inches in diameter. The seeds are black and tuberculate, 1.5 mm diameter.
Occasional large (2.5 inches/7 cm), pink flowers with a white throat, in early summer.
Las Cactaceas de Mexico