Schwantesia TRIEBNERI

Schwantesia TRIEBNERI - Triebner's schwantesia, Schwantesia triebneri.

'Living Stones' seed series.

Rare, collectible plant!

Schwantesia is a genus of succulent plants in the family Aizoaceae, comprising about 11 accepted species distributed in Namibia and the Cape Provinces of South Africa. In nature, representatives of the genus are found in desert and dry shrubland habitats, on rocky slopes, among boulders, in rock crevices, and on gravelly and sandy sites with bright sun, poor mineral soils, and pronounced seasonality of moisture.

Plants usually develop as compact succulent subshrubs or mat-forming mesembs with short shoots and thick paired leaves. Leaves are often trihedral, keeled, gray-green, bluish-green, or glaucous, arranged densely around the stem and partially concealing it, making the plants resemble Lapidaria, Dinteranthus, and other related aizoon succulents.

Flowers in schwantesias are diurnal, solitary, daisy-like, usually yellow, with numerous narrow petals, opening under good lighting. Fruits are dry hydrochastic capsules that open when moistened. The seeds are very small, so during sowing they are distributed on the surface and moistened only by fine misting.

Triebner's schwantesia is a low-growing, compact, and compressed leaf succulent that forms small, yellowish-green cushions over time. Stems are very short. Leaves are opposite in pairs, 4-6 cm (1.6-2.4 in) long, 0.6-1 cm (0.24-0.39 in) wide, up to 0.5 cm (0.2 in) thick, around the internodes, semicircular in cross-section at the base, light gray to yellowish-gray, velvety, especially when young, often with conical pink dots along the ribs, more or less asymmetrical toward the apex of the keel, sometimes with a reddish tint. Flowers are 4-5 cm (1.6-2.0 in) in diameter, solitary, with yellow petals.

Schwantesia seeds are very small, light brown or brownish, rounded or slightly oval.

Sowing is carried out in autumn or early winter, and with stable grow lights and moderate temperatures, year-round, avoiding severe summer heat. A sterile fine-grained mineral substrate based on fine washed sand, perlite, mineral grit, and a small amount of sifted peat or coco coir component is used. Seeds are distributed over the surface and not buried. 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 light at a temperature of about 16-22 °C (61-72 °F), without direct overheating under the sun. The surface is kept slightly damp but not wet; moistening is performed only by fine spraying. Sowing containers are ventilated daily, and condensation is removed, as stagnant moisture is particularly dangerous for aizoon seedlings and quickly causes fungal damage.

The first seedlings may appear within 7-14 days, the usual germination period is about 2-3 weeks, and the maximum possible period with cool temperatures or partial surface drying can extend up to 4-6 weeks. After seedlings appear, the cover is gradually opened slightly, and seedlings are kept under bright diffused light with very gentle moistening. Pricking out is carried out only after noticeable strengthening of the plants and the formation of the first true fleshy leaves, with minimal damage to the roots.

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For growing, the brightest possible location with bright diffused light and several hours of soft direct sun is chosen. Southern, southeastern, and southwestern windows with good ventilation are best suited, while supplemental lighting is used during overcast seasons. After a dark period, the plant is gradually acclimated to direct sun to prevent burns on the fleshy leaves.

Active growth usually takes place during the cooler part of the year, especially in autumn, winter, and spring, when a temperature of about 12-22 °C (54-72 °F) is maintained. In hot summer, the plant is kept drier, protected from overheating and stagnant humid air. Under high temperature, poor lighting, and moist substrate, the leaves stretch out, lose firmness, and roots become vulnerable to rot.

Watering is carried out very cautiously, in small portions, after most of the substrate has dried out. During active growth, the soil may be briefly moistened, but between waterings it must dry out thoroughly. During leaf renewal and during the hot dormant period, watering is sharply reduced so that old leaves can naturally wither without causing rot in the new pair. Stagnant water in the drip tray is not permitted; spraying the leaves is not required.

A very loose mineral substrate is used, with a high content of coarse sand, fine stone grit, pumice, zeolite, perlite, or other inert aerators. The organic fraction is added minimally. Drainage is placed at the bottom of the pot, and a shallow, wide container with drainage holes is selected.

Fertilizer is applied infrequently, only during the period of active growth, no more than once every 6-8 weeks with a weak solution of cactus and succulent fertilizer low in nitrogen. Excess nutrients cause loose, watery growth and disrupts compactness. Repotting is carried out at the beginning of the growth period; after repotting, the plant is kept without watering for a few days. Pruning is not required; only completely dried remnants of old leaves are removed.