Ariocarpus scaphirostris Boed.
Living Rock Cactus
Ariocarpus retusus var. swobodae, Ariocarpus scapharostrus
This species is native to Mexico. It occurs in the valley of Rayones in Nuevo León, typically found between layers of ﬂaky limestone schist, where soil and moisture can accumulate.
Ariocarpus scaphirostris is a slow-growing geophytic cactus with a subglobose, dark green to brown stem with large divergent tubercles. The solitary stem is up to 3.6 inches (9 cm) in diameter. Tubercles are triangular in cross-section, slightly incurved, up to 1.6 inches (4 cm) long, and up to 0.3 inches (0.8 cm) wide. Flowers are magenta-colored, up to 1.6 inches (4 cm) in diameter, and appear in fall. Fruits are reddish-green to brown, up to 0.6 inches (1.5 cm) long, and up to 0.3 inches (0.8 cm) in diameter, and contain tiny black seeds.
USDA hardiness zones 9b to 11b: from 25 °F (−3.9 °C) to 50 °F (+10 °C).
How to Grow and Care
Plant your Ariocarpus in soil specifically formulated for cacti. You can buy a cactus mix at your local nursery. Do not use generic soil mixes because they will not provide enough aeration and drainage. Additionally, using a container without a hole, whether a pot or a terrarium, is a bad idea for the same reason.
Ariocarpus need a lot of sunlight. However, in hot, dry areas, they can be damaged by excessive sunlight, so you should use a shade cloth to limit their sun or move them out of it during the hottest hours of the day. In more temperate areas, direct sunlight is fine.
These cacti prefer to be kept at room temperature or slightly lower and in low humidity.
Water your Ariocarpus when it is dry, but then wait until the soil dries out completely to water it again. The amount of time this takes will vary depending on your climate and the size of your pot if you use one.
Learn more at How to Grow and Care for Ariocarpus.
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