Astrophytum capricorne (A. Dietr.) Britton & Rose
Goat's Horn, Goat's Horn Cactus, Bishop's Cap, Bishop's Hat
Echinocactus capricornis, Astrophytum capricorne var. capricorne
Astrophytum capricorne is a strange-looking cactus with a solitary gray-green stem more or less covered with the typical white woolly flecks and clusters of long twisted or curved spines along the ribs. The stem slowly grows up to 4 feet (1.2 m) tall and 6 inches (15 cm) in diameter. It usually has 8 ribs and up to 10 spines per areole. The young specimens are spherical but soon become ovoid and eventually columnar. The spines are grey to brown and up to 3 inches (7.5 cm) long. Flowers are sweet-smelling, yellow with a red center, and up to 3 inches (7.5 cm) in diameter, and appear in summer. Fruits are reddish, covered with flattened spines, and up to 1 inch (2.5 cm) in diameter.
USDA hardiness zones 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °C).
How to Grow and Care
Goat's Horn Cactus is a desert cactus. It loves the sun and will grow well if provided with plenty of direct sunshine. However, young specimens should be provided with indirect sunlight—insufficient light results in poor growth and unnatural shape.
Use soil with good drainage as this species is rot-prone.
This cactus thrives in average room temperatures between 60 and 75 °F (16 and 24 °C ) from spring until fall. Then, from late fall to late winter, give them a winter rest at temperatures between 45 and 50 °F (7 and 10 °C).
Average indoor humidity is fine for Goat's Horn Cactus. Provide good air ventilation for healthy growth.
During the active growth period, water Goat's Horn Cactus moderately, but allow the top 3/4 of the mixture to dry out thoroughly between waterings. Give only enough water to prevent the mixture from drying out during the resting period.
This species is native to northern Mexico (Coahuila, Nuevo Leon, San Luis Potosi).
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