Acharagma roseanum (Boed.) E.F.Anderson
Coryphantha roseana, Echinocactus roseanus, Escobaria roseana, Gymnocactus roseanus, Neolloydia roseana, Thelocactus roseanus
Acharagma roseanum is a small cactus, solitary at first, later forming a clump of globular stems with ribs that have tubercles with ungrooved areoles. The stems grow up to 2.4 inches (6 cm) tall and 2 inches (5 cm) in diameter. Each areole has 4 to 6 central spines 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 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 are vulnerable to pests, including aphids, mealybugs, scales, 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.
This species is native to northern Mexico.
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