Tromotriche REVOLUTA

Tromotriche REVOLUTA - Tromotriche revoluta, Stapelia revoluta, Stapelia.

Tromotriche is a genus of succulent plants in the dogbane family (Apocynaceae), belonging to the stapeliad succulent group and distributed in South Africa. Representatives of the genus occur predominantly in desert and arid shrub biomes, on rocky sites, among low vegetation, in rock crevices, and on well-drained mineral soils where plants are protected from prolonged moisture stagnation.

The plants develop as low perennial succulent dwarf shrubs with branching fleshy stems. Shoots are usually four-angled or multi-angled, green, gray-green, or slightly brownish, with toothed ribs and reduced leaves in the form of minute scales. The root system is comparatively shallow, so plants are sensitive to heavy wet soil and develop better in a loose mineral substrate.

The flowers of Tromotriche are star-shaped, fleshy, often with reflexed corolla lobes, intricate patterning, folds, hairs, or a tuberculate surface. Like many stapeliads, they may have a specific odor that attracts pollinating flies. Following pollination, paired follicles form containing numerous flat seeds equipped with a silky plume for wind dispersal.

Tromotriche revoluta is a succulent dwarf shrub from the Cape Provinces of South Africa, growing predominantly in desert and arid shrub habitats. The plant forms clusters of fleshy four-angled shoots that can be erect, decumbent, or slightly ascending. Stems are gray-green or green, with pronounced toothed ribs, while leaves are reduced and virtually unnoticeable.

Flowers develop on short pedicels, more often near the base of shoots or on the lower part of the plant. The corolla is fleshy, star-shaped, with lobes distinctly reflexed backward, as reflected in the specific epithet. Coloration is typically complex, with dark purple, brown, yellowish, or greenish tones, spots, and stripes. The flowers look unusual and may resemble marine animals or fantastic stars, but their scent is designed not for humans, but for insect pollinators.

In cultivation, Tromotriche revoluta is valued as a rare collector's stapeliad succulent with an unusual flower shape and compact habit. The plant is well-suited for collections of Stapelia, Orbea, Huernia, Caralluma, and other related succulents, as well as for dry sunny windowsills, greenhouses, and well-ventilated mini-collections.

Seeds of Tromotriche are flat, brown or dark brown, equipped with a long silky plume that is carefully removed before sowing.

Before sowing, seeds can be soaked for 2-4 hours in a weak solution of potassium permanganate or biofungicide with the addition of a growth stimulant: SUPERthrive, HB-101, Aminosol, Epin, or Zircon. A sterile mineral seed substrate based on cactus soil, fine perlite, and washed sand is used. Seeds are distributed over the surface, lightly pressed down, and covered with a thin layer of sand or sifted substrate about 1-2 mm (0.04-0.08 in) deep.

The sowing is gently moistened with a spray bottle, covered with a transparent lid, or placed in a mini-greenhouse. Temperature is maintained at 22-26 °C (72-79 °F); bright indirect light is required without direct overheating. Ventilation is conducted daily for 10-15 minutes, condensation is removed, and the substrate surface is kept slightly moist but not wet.

The first seedlings can appear within 7-14 days; germination typically takes 2-4 weeks, while the maximum possible period under cool conditions may extend to 6-8 weeks. After emergence, the cover is gradually opened, and seedlings are kept under bright indirect light, moderate warmth, and cautious watering. Pricking out is carried out after the seedlings strengthen and begin growing small fleshy shoots, when the plants can be conveniently transferred with a small root ball of substrate.

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Bright indirect lighting with gentle morning or evening sun is used for Tromotriche. East-facing, southeast-facing, and well-lit west-facing windows are most suitable, while on a south window summer protection against overheating and direct midday rays is required. In poor light, shoots stretch, become thin, and set flower buds less readily, while severe overheating can cause sunburn.

During the period of active growth, a temperature of 20-28 °C (68-82 °F) is maintained; with good ventilation, the plant tolerates summer heat. A bright, cool winter rest at 10-15 °C (50-59 °F) with very infrequent watering is preferred. The minimum safe temperature for a container-grown plant is around 5-8 °C (41-46 °F) only under dry conditions. Cold, wet soil rapidly triggers rot of roots and the base of shoots.

Watering is carried out carefully after the potting medium dries out completely. In the warm season, the plant is watered moderately without persistent wetness, and excess water from the tray is always discarded after 15-20 minutes. During the cool dormant period, watering ceases almost entirely and is applied only upon noticeable wrinkling of shoots. Water must not linger around the base of stems, and misting is generally not needed.

A very loose, mineral, fast-drying soil mix is used: commercial cactus and succulent mix, coarse sand, fine gravel, pumice, zeolite, crushed brick, perlite, and a small quantity of leaf mold soil. A layer of drainage material is mandatory at the bottom. Pots are chosen shallow, wide, stable, and with drainage holes, as stapeliad roots are typically shallow and exceptionally sensitive to overwatering.

Repotting is performed in spring, typically once every 2 years or following substantial expansion of the clump. Careful potting on is used, removing old, damaged, or rotting shoots. After repotting, the plant is kept without watering for 5-7 days. Fertilization is applied only during active growth once every 4-6 weeks using a weak solution of cactus and succulent fertilizer low in nitrogen. Excess nitrogen is undesirable, as it causes soft watery growth and elevates rot risk.

Propagation in culture is most frequently carried out via stem cuttings. Cuttings are taken from mature shoots, dried for several days until a calloused skin forms over the cut, and planted into a dry or barely damp mineral substrate. Initial watering after rooting is applied very gingerly so as not to induce rot at the cutting base.