Mammillaria CARMENAE 'RUBRISPINA'

Mammillaria CARMENAE 'RUBRISPINA' - Red-spined Carmen's mammillaria, Mammillaria carmenae 'Rubrispina'.

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 scrublands, 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 whose tips areoles with radial and central spines are located. In many species, wool, bristles, buds, flowers, and fruits form in the axils between tubercles.

Flowers are usually formed in a ring closer to the top 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.

Red-spined Carmen's mammillaria is a miniature cactus with globose or short-cylindrical stems that form dense clumps of numerous shoots. Tubercles are conical, arranged spirally, and areoles are densely covered with slender radial spines. The main distinguishing feature of the 'Rubrispina' form is the reddish or pinkish-brown spines contrasting with the green coloration of the stem. Central spines may be absent or weakly pronounced.

Flowering is observed in spring and early summer. Flowers are small, funnel-shaped, from creamy-white to pale pink, gathered in a ring near the top of the stem. Against the background of reddish spines, they look especially ornamental. Fruits are narrow, pink or red, containing small dark seeds.

Mammillaria seeds are small, dark brown or black, rounded or slightly oval. Germination in careful greenhouse conditions is usually about 50-80%.

Sowing is carried out in spring or year-round if stable supplemental lighting is available. A sterile fine-grained mineral substrate based on sifted cactus soil, fine sand, perlite, and mineral chips is used. Seeds are distributed over the surface, slightly pressed into the moist soil, and covered with a minimal layer of fine sand or not covered at all. 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 in bright diffused lighting and at a temperature of around 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 and condensation is removed, since stagnation of moisture is dangerous for mammillaria seedlings and quickly causes fungal infections.

The first sprouts may appear in 7-10 days, the normal germination period is 10-21 days, and the maximum possible period with 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 in bright diffused light and careful moistening. Pricking out is carried out after noticeable strengthening of the plants and appearance of the first spines, usually not earlier than several months, with minimal root damage.

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A spot with maximum light and several hours of direct sun per day is chosen for cultivation. South, southeast, and southwest windows are best suited, and supplemental lighting is recommended during overcast seasons. After dark overwintering or repotting, the plant is gradually acclimated to direct sun to avoid burns on the stem.

During active growth, a temperature of about 20-28 °C (68-82 °F) is maintained with good air circulation. The plant is heat-loving and does not tolerate cold dampness. Overwintering is carried out in bright, dry, and moderately cool conditions, around 8-12 °C (46-54 °F), with almost complete cessation of watering. At lower temperatures, a moist substrate is especially dangerous and can cause root rot.

Watering is carried out moderately, only after complete drying out of the substrate. In spring and summer, the soil is moistened in small portions, with mandatory draining of 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 under cool keeping and poor ventilation.

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

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