Ariocarpus fissuratus aka False Peyote

Ariocarpus fissuratus is a small cactus known as living rock. It belongs to the cactus family, Cactaceae. Its native range spans southwestern and southern Texas into Mexico. Kew also records it in the Mexican state of Jalisco. It grows in deserts and dry scrub. In Texas, it occurs along the Rio Grande and lower Pecos River. Its wild sites include limestone plains, low ridges, and rocky hills. Some plants also grow in soils rich in gypsum.

The plant forms a low rosette with a star-like outline. Most plants grow alone, though old plants may form side shoots. Fleshy stem bumps, called tubercles, fit close together. They range from roughly triangular to rounded and lack spines. Deep cracks and rough surfaces give them a rock-like look. The stem sits almost level with the ground. Its grey-green colour may turn more yellow with age. This shape, colour, and texture help hide it among stones.

Growth is very slow, and plants take decades to mature. LLIFLE gives widths of about 0.5–0.7 feet [0.15–0.20 metres]. Some take up to 50 years to reach the smaller size. During harsh drought, the parts above ground can shrink. Loose stones may then cover the plant, while its taproot lives on. Pink flowers make wild plants easier to find among the rocks. Chicago Botanic Garden lists flowering from July to August. The fruit is white or green and holds many seeds.

In cultivation, this cactus needs full sun and dry soil. Use a loose mineral cactus mix that drains well. Extra pumice or perlite can help keep the mix open. Clay pots help the soil dry between waterings. Deep pots give the thick root and stem base room. That swollen base can crack a pot that confines it. Chicago Botanic Garden lists USDA hardiness zones 9–11. LLIFLE reports frost tolerance down to 14°F [-10°C]. It also describes winter care at 41°F [5°C] with ample light.

Growers use living rock as a specimen plant. Older plants can develop weak roots and succumb to disease. LLIFLE suggests longer repotting intervals once plants reach about 0.7 feet [0.20 metres] across. Wild collection has threatened some small, isolated populations. Protection applies in parts of its range, though illegal collection continues. The species remains abundant in some suitable wild sites.