Echinocereus poselgeri Lem.
Dahlia Cactus, Dahlia Hedgehog Cactus, Dahlia Apple Cactus, Lead Pencil Cactus, Pencil Hedgehog Cactus, Pencil Cactus, Sacasil, Zocoxochitl
Cereus poselgeri, Cereus poselgerianus, Cereus tuberosus, Echinocereus kroenleinii, Echinocereus tamaulipensis, Echinocereus tuberosus, Echinocereus waldeisii, Wilcoxia kroenleinii, Wilcoxia poselgeri, Wilcoxia tamaulipensis, Wilcoxia tuberosa
Echinocereus poselgeri is a shrubby cactus with slender, sparingly branched, initially erect, later sprawling or clambering stems with 8 to 10 ribs and clusters of closely appressed spines. The cylindrical stems are up to 4.3 feet (1.3 m) long and 0.8 inches (2 cm) in diameter. Spines are stiff and straight, usually tan, brown, or black, sometimes yellow, pale pink, ashy white, or gray. Flowers are rose-pink to pink-purple and appear in late spring and early summer. They are up to 2.4 inches (6 cm) long and 2.8 inches (7 cm) in diameter. Fruits are dark green to brownish, up to 1.2 inches (3 cm) long, and up to 06 inches (1.5 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
If you can successfully grow other globular cactus, you can most likely grow Echinocereus well. One of the key factors in success with these is avoiding any hint of wet soil. Because their root systems are weak, they are especially prone to root rot, eventually killing your plant. Otherwise, they thrive on a program of intense, bright light, little water, and a steady diet of light fertilizer. These cacti are vulnerable to mealybugs and aphids.
Echinocereus are slow-growing cacti that should only need repotting every other year or so. You can prolong the time to repotting by removing plantlets and potting them up in their own pots. When repotting a cactus, carefully remove it from its pot and knock away any clumped soil. These plants tend to be shallow-rooted with weak root systems, so take care not to damage their roots.
Learn more at How to Grow and Care for Echinocereus.
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