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Arizona Rainbow Hedgehog Cactus, Cabeza de Viejo
Scientific Name: Echinocereus rigidissimus (Engelm.) Rose
Synonym: Cereus pectinatus v. rigidissimus, Echinocereus pectinatus v. rigidissimus
Family: Cactaceae
Arizona Rainbow Hedgehog Cactus, Cabeza de Viejo (Echinocereus rigidissimus)
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Echinocereus rigidissimus var. rubispinus 'Ruby Rainbow'
Recommended Temperature Zone:
sunset: 9b-11
USDA: 9-12

Frost Tolerance: Hardy to 23 F (-5C)

Minimum Avg. Temperature: 50F (10C)

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

Propagation: Seeds

Mature plants with a good light will generally have red to deep pink spines.
Arizona Rainbow Hedgehog Cactus, Cabeza de Viejo (Echinocereus rigidissimus)

Blooming Habits:
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.

Fruiting Habits:
Occasional large (2.5 inches/7 cm), pink flowers with a white throat, in early summer.

References:
Las Cactaceas de Mexico

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