Echinocactus platyacanthus Link & Otto
Miniature Barrel Cactus, Hedgehog Cactus, Twisted Rib Cactus, Fishhook Cactus
Echinocactus setispinus, Cactus bicolor, Echinocactus hamatus, Ferocactus setispinus, Hamatocactus bicolor, Hamatocactus setispinus
Thelocactus setispinus is a small cactus with a solitary, globose to elongate-globose stem with 12 to 15 ribs and clusters of 9 to 17 radial spines and 1 to 3 central spines per areole. The stem grows up to 12 inches (30 cm) tall and 4 inches (10 cm) in diameter. Radial spines are needle-shaped, bright brown or white, and up to 1 inch (2.5 cm) long. Central spines are longer and stronger, straight and curved like a hook at the tip. Flowers are yellow with a red center, up to 2.8 inches (7 cm) long and 1.6 inches (4 cm) in diameter. They appear in late summer to fall. Fruits are red, round, or elliptical and up to 0.6 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
Overall, these are beautiful cacti for dish gardens or indoor display. A collection of them is especially attractive, as they look like a collection of balls tossed upon the ground. However, 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 is vulnerable to pests, including aphids, mealybugs, scale, and whiteflies. 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. Next, 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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