Echinocereus dasyacanthus Engelm.
Texas Rainbow, Texas Rainbow Cactus, Texas Rainbow Hedgehog, Spiny Hedgehog Cactus, Golden Rainbow Hedgehog, Yellow Pitaya, Yellow-Flowered Pitaya
Echinocereus pectinatus var. dasyacanthus, Cereus dasyacanthus, Cereus ctenoides, Echinocereus hildmannii, Echinocereus steereae
Echinocereus dasyacanthus is a cactus with a single stem or few branched, forming loose clumps of up to 20 stiff stems in old age. The stems have 15 to 18 ribs and grow up to 10 inches (25 cm) long and up to 3 inches (7.5 cm) in diameter. Spines usually overlap, making the stem not visible. The color of the spines ranges from tan, yellow to pink. Flowers appear in spring at the sides of the stem above the areoles close to the stem apex. They are usually bright yellow with a green throat, up to 5 inches (12.5 cm) long and wide. Fruits are dark purple, globose to ellipsoid, up to 2.4 inches (6 cm) long, and up to 1.8 inches (4.5 cm) wide.
USDA hardiness zone 8b to 10b: from 15 °F (−9.4 °C) to 40 °F (+4.4 °C).
How to Grow and Care
If you can successfully grow other globular cacti, you can most likely grow Echinocereus well. One of the key factors in success 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. Echinocereus is vulnerable to mealybugs and aphids.
Echinocereus are slow-growing cacti that should only need repotting every other year or so. You can prolong repotting by removing plantlets and potting them up in 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.
See more at How to Grow and Care for Echinocereus.
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