Mammillaria CARMENAE

Mammillaria CARMENAE - Carmen pincushion cactus, Isla Carmen pincushion cactus.

Mammillaria is a large genus of low-growing succulent plants in the cactus family (Cactaceae), comprising about 170-200 species distributed mainly in Mexico, as well as in the southern United States, Central America, the Caribbean region, and northern South America. In nature, representatives of the genus occur in deserts, semi-deserts, dry shrublands, tropical deciduous forests, on limestone slopes, rocky plains, and in mountainous areas with bright sun and well-drained soils.

Plants usually develop as solitary or clustering globose, flattened-globose, cylindrical, or short-columnar cacti. Instead of ribs, they have distinct tubercles, on the tips of which are areoles with radial and central spines. In many species, wool, bristles, buds, flowers, and fruits form in the axils between the tubercles.

Flowers usually form in a ring near the apex of the stem and can be white, cream, yellow, pink, red, or purple. After pollination, elongated or club-shaped fruits develop, often red or pink, containing small brown or black seeds with a pitted or reticulate surface.

Carmen pincushion cactus is one of the species favored by cactus enthusiasts, growing well under indoor conditions. The stem is small, up to 5 cm (2 in) in height. The cactus has a whimsical ball shape covered with white or brownish hairs. The width of the plant reaches 15 cm (6 in). It blooms with white or pink flowers. This species is not demanding of weather conditions. With proper care, it withstands light frosts.

Mammillaria seeds are small, dark brown or black, rounded or slightly oval. Seed germination rate under neat greenhouse conditions is usually about 50-80%.

Sowing is carried out in spring or year-round if stable lighting is available. A sterile fine-grained mineral substrate based on sifted cactus soil, fine sand, perlite, and mineral grit is used. Seeds are distributed over the surface, lightly pressed into the moist soil, and sprinkled with a minimal layer of fine sand or left uncovered. The sowing is moistened from a spray bottle with a weak solution of potassium permanganate or biofungicide with the addition of a growth stimulant: SUPERthrive, HB-101, Aminozol, Epin, or Zircon. The container is covered with a transparent lid or placed in a greenhouse.

Germination is carried out under bright diffused light and at a temperature of about 22-26 °C (72-79 °F), without direct overheating under the sun. The surface is maintained moderately moist but not wet; moistening is performed only by fine spraying. Sowings are ventilated daily, condensation is removed, as stagnant moisture is dangerous for Mammillaria seedlings and quickly causes fungal infections.

The first sprouts may appear after 7-10 days, the usual germination period is 10-21 days, and the maximum possible period under temperature fluctuations or partial drying of the surface can stretch up to 4-6 weeks. After sprouts appear, the cover is gradually opened, and seedlings are kept under bright diffused light and careful moistening. Pricking out is performed after notable strengthening of the plants and the emergence of the first spines, usually no earlier than several months, with minimal damage to the roots.

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For cultivation, the brightest possible location with several hours of direct sunlight per day is chosen. South-, southeast-, and southwest-facing windows are best suited, and supplemental lighting is recommended during overcast seasons. After a dark wintering or repotting, the plant is gradually acclimated to direct sun to avoid burns on the stem.

During the period of active growth, a temperature of about 20-28 °C (68-82 °F) is maintained with good air circulation. The plant is warmth-loving and dislikes cold dampness. Wintering is conducted bright, dry, and moderately cool, around 8-12 °C (46-54 °F), with almost complete cessation of watering. At lower temperatures, moist substrate is especially dangerous and can cause root rot.

Watering is carried out moderately, only after the substrate has dried out completely. In spring and summer, the soil is moistened in small portions, with mandatory draining of excess water from the drip tray. In autumn, watering is gradually reduced; in winter, the plant is kept almost dry. Ingress of water into the axils between tubercles is undesirable, especially during cool maintenance and poor ventilation.

A loose mineral substrate for cacti is used with the addition of coarse sand, fine stone chips, pumice, zeolite, perlite, or other inert aerators. The organic fraction is added moderately. High drainage is placed at the bottom of the pot, and a shallow, stable, not overly spacious container is chosen.

Fertilizer is applied only during the period of active growth, once every 4-6 weeks with a weak solution of fertilizer for cacti and succulents with reduced nitrogen content. An excess of nutrients causes loose growth and reduces resistance to rot. Repotting is carried out in spring as the pot becomes filled with roots; after repotting, the plant is kept without watering for several days. Pruning is not required, and separation of lateral offsets is possible only on well-expanded specimens.