Copiapoa HUMILIS

Copiapoa HUMILIS - Low copiapoa, Dwarf copiapoa, Copiapoa humilis.

Copiapoa is a genus of succulent plants in the family Cactaceae, comprising Chilean desert cacti distributed mainly in the coastal and inland areas of the Atacama Desert. In nature, representatives of the genus occur on stony slopes, coastal terraces, gravel plains, in dry valleys, and places where precipitation is extremely scarce, while moisture from fogs and nocturnal condensation plays a significant role.

Plants usually develop as spherical, short-cylindrical, columnar, or clustering cacti with pronounced ribs, a woolly apex, and sturdy spines. The coloration of the stems is often green, gray-green, brownish-green, or glaucous, which helps the plants endure intense sun, dry air, and sharp temperature fluctuations.

Flowers in copiapoa are usually diurnal, funnel-shaped, yellow or lemon-yellow, appearing near the apex of the stem. After flowering, small fruits with small dark seeds develop. Seeds in most species are small, so during sowing they are distributed on or nearly on the surface and require careful moistening without sogginess.

Low copiapoa has a gray-green stem with a brownish tint, spherical, up to 5 cm (2 in) tall and 4 cm (1.6 in) in diameter. The 10-12 ribs are divided into small rounded tubercles. The spines are straight, bristle-like, gray. Radial spines number 10-12, about 1 cm (0.4 in) long. Central spine is 1, up to 2 cm (0.8 in) long. Flowers are light yellow, about 3 cm (1.2 in) in diameter.

Copiapoa seeds are small, dark, rounded or slightly oval. Germination in careful greenhouse conditions usually averages about 40-70%.

Sowing is carried out in spring or year-round in the presence of stable supplementary lighting. 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 not covered at all. 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 mini-greenhouse.

Germination is carried out under bright diffused lighting and a temperature of about 20-24 °C (68-75 °F), without direct overheating under the sun. The surface is maintained moderately moist but not wet; moistening is performed only with a fine spray. Crops are ventilated daily, and condensation is removed, as stagnant moisture is particularly dangerous for copiapoa seedlings and quickly triggers fungal infections.

The first sprouts may appear in 7-14 days; the usual germination period is 2-4 weeks, while the maximum possible period with temperature fluctuations or partial drying of the surface can extend to 6-8 weeks. After sprouts appear, the cover is gradually opened slightly, and seedlings are kept under bright diffused light and cautious moistening. Pricking out is carried out after the plants have noticeably strengthened and the first spines have appeared, usually no earlier than after several months, with minimal damage to the roots.

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The brightest possible spot with several hours of direct sun per day is chosen for cultivation. Southern, southeastern, and southwestern windows are best suited, and supplementary 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 tolerates heat better with dry substrate and ventilation, but reacts poorly to overheated wet soil. Wintering is kept bright, dry, and cool, around 6-12 °C (43-54 °F). With cool conditions, watering practically ceases, as moist substrate combined with low temperature quickly leads to root rot.

Watering is carried out very moderately, only after the substrate has dried out completely. In spring and summer, the soil is moistened in small portions, without prolonged wetting of the root ball and with mandatory draining of water from the saucer. In autumn, watering is gradually reduced; in winter, the plant is kept almost dry. Misting is not required, and water contact on the woolly apex is undesirable with poor ventilation.

A very loose mineral cactus substrate is used with a high content of coarse sand, fine stone grit, pumice, zeolite, perlite, or other inert aerators. The organic component is kept to a minimum. High drainage is laid at the bottom of the pot, and the container is chosen to be shallow, stable, not too spacious, and definitely with drainage holes.

Fertilizer is applied rarely, only during the period of active growth, once every 5-6 weeks with a weak solution of fertilizer for cacti and succulents with reduced nitrogen content. Excess nutrients cause unnaturally loose growth and reduce resistance to rots. 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 usually not required.