Echinocereus viereckii Werderm.
Echinocereus viereckii subsp. viereckii
This species is native to Mexico (Tamaulipas).
Echinocereus viereckii is a much-branched cactus with yellowish-green to bright green, cylindrical stems with 6 to 9 tuberculate ribs lined with areoles that bear clusters of yellow spines. It branches profusely from the base, forming a clump. The stems are erect, ascending, or sprawling, up to 12 inches (30 cm) long and up to 2.4 inches (6 cm) in diameter. Spines are up to 1 inch (2.5 cm) long. Each areole bears 3 to 5 central and 7 to 9 radial spines. Flowers are funnel-shaped, up to 3.6 inches (9 cm) long, and up to 4.4 inches (11 cm) in diameter. They are brilliant magenta and appear in spring.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
If you can grow other globular cacti, 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, slight 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, remove it from its pot and remove 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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