Acharagma roseanum (Boed.) E.F.Anderson
Coryphantha roseana, Echinocactus roseanus, Escobaria roseana, Gymnocactus roseanus, Neolloydia roseana, Thelocactus roseanus
Acharagma roseanum, also known as Acharagma roseana, is a small, solitary or clump-forming cactus with globular stems that are up to 2.4 inches (6 cm) tall and up to 2 inches (5 cm) in diameter. The ribs of the stems have tubercles with ungrooved areoles. Each areole has 4 to 6 central and 15 to 30 radials spines. They are whitish-yellow to golden yellow. Flowers are cream-yellow to pink with a darker midvein and appear at the stem tips.
USDA hardiness zones 9a to 11b: from 20 °F (−6.7 °C) to 50 °F (+10 °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 to never 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 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.
Acharagma roseanum is native to northern Mexico.
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