Euphorbia MAMMILLARIS

Euphorbia MAMMILLARIS - Indian corn cob, Euphorbia mammillaris.

Euphorbia is a genus of succulent and non-succulent plants in the family Euphorbiaceae, comprising about 2000 species growing across tropical and subtropical regions of all continents. It is characterized by high adaptation to diverse climatic conditions and growth forms - from herbs to trees and shrubs.

Members of the genus feature thickened, fleshy, often ribbed stems, sometimes with spines, which store water, making them resistant to drought and irregular watering. The leaves can be either large or reduced. The flowers are united into specialized inflorescences - cyathia, surrounded by bracts that are often mistaken for petals.

Many species in nature attain large sizes, yet most euphorbias are excellently adapted for indoor cultivation and are valued for their ornamental appeal, unusual forms, and resilience.

Euphorbia mammillaris is one of the rare species. It is a small, short-stemmed, monoecious shrub forming a dense clump. The stem is thick, erect, simple, and ribbed, measuring 1.5-6 cm (0.6-2.4 in) in diameter and 25-35 cm (9.8-13.8 in) in height, bright green in color. There are usually numerous lateral branches arching upward. The ribs number 7-17, with hexagonal tubercles arranged in vertical rows separated by horizontal grooves. Scattered, thick, blunt, and whitish spines 1 cm (0.4 in) long are sometimes present, representing sterile peduncles. The leaves are small and ephemeral. The inflorescences are solitary yellow cyathia at the stem apexes, on a peduncle 2 mm (0.08 in) long, with several involucral bracts 3 mm (0.12 in) long. The nectaries are oval, ranging from yellow-green to purple. It blooms from late winter to early summer. The seeds are ovoid, 3 mm (0.12 in) long and 2 mm (0.08 in) wide, smooth.

Seeds are sown in spring on the surface of a sterile mix of sod soil, sand, and crushed brick. Burying depth is no more than 2 mm (0.08 in). Sowings are moistened with a spray bottle, covered with film, and maintained at a temperature of 21-22 °C (70-72 °F) in light, but not under direct rays. They are ventilated daily.

Seedlings emerge within 10-20 days. The maximum germination period can exceed 30 days. As seedlings appear, the cover is gradually removed. Young plants are pricked out in the phase of 2-3 true leaves.

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It prefers bright lighting and sunny windowsills, but can also adapt to diffused light. Under adequate light, the stem coloration becomes richer and can take on a yellowish cast. In partial shade, it develops slowly and loses its compact form.

In summer, the optimal temperature is 21-23 °C (70-73 °F), and in winter 15-18 °C (59-64 °F), not below 12 °C (54 °F). During colder periods, the plant requires a rest phase. Watering is carried out moderately as the soil dries out. In winter, watering is minimal, only to prevent total drying of the substrate. Excess moisture induces rot.

It grows in a lightweight, breathable succulent soil consisting of equal parts sod soil, leaf mould, coarse sand, and charcoal. A drainage layer of expanded clay or gravel is mandatory. Repotting is carried out in spring once every 3-4 years, handling the root system with care.

Feedings are applied 1-2 times during spring and summer using succulent fertilizers. Excess nitrogen is contraindicated - it leads to loss of ornamental quality and stretching of shoots. Organic fertilizers improve tissue coloration and density.

Pruning is not required; the plant maintains its shape on its own. Propagation is possible by seeds and cuttings. Cuttings are rooted after callousing. Seeds produce good emergence when germination conditions are met.