Living Rock, Seven Stars
Scientific Name: Ariocarpus retusus Scheidweiler
Synonym: Anhalonium areolosum, Anhalonium elongatum, Anhalonium prismaticum, Anhalonium pulvilligerum, Anhalonium trigonum, Ariocarpus confusus, Ariocarpus elongatus, Ariocarpus pulvilligeris, Mammillaria prismatica
Family: Cactaceae
Sunset®: 11,13
USDA: 9b-11
Frost Tolerance: Hardy to 27°F (-3°C)
Sun Exposure: Light shade to full sun
Origin: Mexico (San Luis Potosi, Coahuila, Nuevo Leon)
Growth Habits: Solitary, slow growing up to 10 inches in diameter (25 cm), tubercles up to 0.8 inch long (2 cm) with flat surface; tap root
Watering Needs: Very little water
Propagation: Seeds, occasionally grafted
Ariocarpus retusus is the largest of the genus, it is also one of the easier and faster to grow. It might still take 8 years to go from seeds to flowering size. It take one year or more just to show the typical rosette shape.
Ariocarpus retusus at Holly Gate (Photo Terry Hewitt)
Blooming Habits:
2 inches in diameter diurnal white flowers (5 cm), with pink stripe at the axis of the petals.
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