Mammillaria beneckei

Mammillaria beneckei is a small cactus in the Cactaceae family. It comes from western and central Mexico. Its range includes Jalisco, Michoacán, Oaxaca, and Guerrero. It grows in dry woodland, desert, and dry shrubland. Wild plants remain widespread and abundant across much of their range. Dams in Jalisco have flooded some local groups. Collectors grow this species as an ornamental pot plant.

Young plants start with one stem, then form basal offsets. These build clumps about 1.6 feet (0.5 metres) wide, sometimes more. Each stem reaches 0.16–0.33 feet (0.05–0.10 metres) tall. Stem width ranges from 0.16–0.23 feet (0.05–0.07 metres). The rounded stems have flattened tops and lengthen with age. Their colour ranges from green to brownish green, often with purple tones. Soft, cone-shaped tubercles cover the stems and may turn red or purple. Their bases hold little wool and few, if any, bristles.

Each spine cluster has 12–15 fine radial spines. These are white or yellow, with darker tips. Two to six brown or black central spines stand among them. One or two longer central spines have hooked ends. The flowers have a narrow tube and a flat, spreading face. Most are deep yellow, though some are orange. They reach about 0.10 feet (0.03 metres) across, or slightly more. Flowers appear sparingly and have a short life. They open at night and close for good around noon. Slender red fruits widen into a club shape near the tip. The dark brown seeds have a rough surface.

Use a neutral cactus mix that lets water drain freely. Pots need good drainage, as excess water can cause rot. Water well during active growth, without keeping the mix too wet. Keep the plant dry through winter and reduce water in larger pots. Summer feeding can use a fertiliser rich in potassium. Frost poses a serious risk, and winter warmth improves success. The suggested resting temperature is 8–12°C.

Plants can fill a large pot within a few years. Older clumps need broad, shallow pots as they spread. Growers can raise new plants from seed or detached offsets. Let cut surfaces dry before placing offsets on soil. Protect young seedlings from full sun while they develop.