Prime destination for succulent lovers

Ariocarpus retusus subsp. trigonus (Star Rock)


Scientific Name

Ariocarpus retusus subsp. trigonus (F.A.C.Weber) E.F.Anderson & W.A.Fitz Maur.

Common Names

Star Rock, Living Rock


Anhalonium trigonum, Ariocarpus trigonus

Scientific Classification

Family: Cactaceae
Subfamily: Cactoideae
Tribe: Cacteae
Genus: Ariocarpus


Ariocarpus retusus subsp. trigonus is a сolitary rosette-forming, geophytic cactus, rising slightly above ground level. The stem is globose, more or less depressed, rounded on top, mostly yellowish-green, up to 10 inches (25 cm) tall and up to 12 inches (30 cm) in diameter. The flowers are cream-white to yellowish-white or yellow (occasionally with reddish mid-ribs) with a satin sheen, up to 1.8 inches (4 cm) long and up to 2 inches (5 cm) in diameter.

Ariocarpus retusus subsp. trigonus - Star Rock

Photo via

How to Grow and Care

You should plant your Ariocarpus in soil specifically formulated for cacti. You can buy 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 it is a pot or a terrarium, is a bad idea for the same reason.

Ariocarpus need a lot of sun. However, in hot, dry areas, they can be damaged by excessive sunlight, so you should either use a shadecloth to limit their sun, or move them out of the sun during the hottest hours of the day. In more temperate areas, direct sunlight is fine. Ariocarpus plants 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. Remember, when dealing with any kind of cactus, watering too often is much worse than not watering enough. Do not water during winter… – See more at: How to Grow and Care for Ariocarpus.


Native to Mexico (Tamaulipas, Nuevo Leon).


BACK TO genus Ariocarpus
SUCCULENTOPEDIA: Browse succulents by GenusFamilyScientific NameCommon NameOrigin, or cacti by Genus

Photo Gallery

Subscribe now and be up to date with our latest news and updates.

Share this with other succulent lovers!