Echinocactus horizonthalonius Lem.
Eagle's Claw, Eagle's Claw Cactus, Devil's Head Cactus, Devilshead, Turk's Head Cactus, Turk's Head, Blue Barrel Cactus, Silverbell Cactus, Horse Maimer, Horse Crippler
Echinocactus equitans, Echinocactus horizontalis, Echinocactus horizonthalonius subsp. horizonthalonius, Echinocactus laticostatus, Echinocactus pachycornis, Meyerocactus horizonthalonius
Echinocactus horizonthalonius is a relatively small cactus with gray-green to blue-gray spherical, hemispherical, columnar, or flat-topped, usually solitary stem. It grows up to 18 inches (45 cm) tall and up to 8 inches (20 cm) in diameter. The stem is made up of curving sections that twist around the body in a spiral fashion. These sections are lined with areoles bearing up to 10 spines each. The spines are pink, gray, or brown and up to 1.6 inches (4 cm) long. Flowers are bright pink to magenta and up to 3.6 inches (9 cm) in diameter. They open around midday and close for the night. They also open after the plant receives rainfall, and although most of the flowers occur in late spring, they may bloom again in late summer and fall if rain occurs. Fruits are hairy or woolly and pink or red.
USDA hardiness zones 8b to 10b: from 15 °F (−9.4 °C) to 40 °F (+4.4 °C).
How to Grow and Care
These cacti do best in a very sunny window, perhaps a southern exposure. Plants that do not get enough sunlight will grow more slowly and fail to thrive.
It is critical never to let these cacti be exposed to prolonged periods in water or even very high humidity. They will suffer from rot in the presence of humidity.
Echinocactus are vulnerable to pests, including aphids, mealybugs, scale, and whitefly. If possible, identify the infestation as early as possible and treat it with the leave toxic option.
It is best to repot at the beginning of the growing season or summer. To repot a cactus, make sure the soil is dry before repotting, then gently remove the pot. Knock away the old soil from the roots, making sure to remove any rotted or dead roots in the process.
Learn more at How to Grow and Care for Echinocactus.
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