Synonyms:

No recorded synonyms.

Habitat:

Euphorbia lactea cv. White Ghost f. cristata is a form obtained exclusively in cultivation and does not occur in the wild.

Description:

The genus name Euphorbia derives from Euphorbos, physician to King Juba II of Mauretania, who was known for the medicinal use of plants belonging to this group. The specific epithet lactea, from the Latin lac (“milk”), refers to the dense white latex released when the stem is cut. The cultivar name White Ghost is of horticultural origin and alludes to the plant’s very pale, almost entirely white variegation, which gives it a ghostly appearance. The designation f. cristata indicates a particular growth form caused by a mutation known as fasciation, which produces flattened, undulating stems with a fan-shaped growth habit.

Euphorbia lactea cv. White Ghost f. cristata belongs to the genus Euphorbia and to the family Euphorbiaceae. It is characterised by a distinctive fan-shaped form resulting from crested growth, which gives rise to flattened, compact and undulating crests with a sinuous outline. It is a plant of relatively modest size, typically reaching approximately 30–60 cm in height. The stem displays well-defined ribs that are slightly winged and sometimes tinged with pink. Along the margins are small tubercles bearing rigid, forked spines of brownish or blackish colour. The overall color ranges from ivory white to light grey, with a diffuse white-and-green variegation across the surface and subtle green or pinkish hues, more evident in the new growth.

Flowering is rare in cultivation and, when it occurs, is inconspicuous. As in all species of the genus Euphorbia, the flowers are actually cyathia, inflorescences composed of reduced structures lacking true petals. The small cyathia, yellow-green to whitish in colour, may occasionally form along the edges of the crests. Fruit production is uncommon; when present, the fruits are small trilocular capsules containing minute seeds.

Cultivation:

Growth is slow, as the reduced amount of chlorophyll limits photosynthesis. Cultivation therefore requires a certain degree of care, particularly with regard to watering and light exposure.

A highly free-draining soil is essential, as the plant is particularly sensitive to waterlogging. The ideal substrate is light and airy, preferably mineral-based, with the addition of inert materials such as pumice, perlite or lava grit, which improve drainage and root aeration.

Water only when the substrate has dried out completely, avoiding any standing moisture, which can quickly lead to rot. During the growing season, watering may be slightly more frequent, provided the soil dries thoroughly between applications; in winter, watering should be greatly reduced or suspended.

A very bright position is required, with intense light but without prolonged direct sunlight. Adequate light promotes steady growth and may enhance subtle pink tones in new growth, while excessive sun exposure can cause sunburn. During the warmer months, the plant may be placed outdoors, gradually acclimating it to higher light levels. It is sensitive to cold and requires temperatures above 12 °C.

Frequent feeding is not necessary due to its slow growth. During the growing season, a low-nitrogen, well-balanced fertiliser formulated for succulents may be applied about once a month. Feeding should be suspended in winter.

Repotting is not required often, but the plant benefits from it when the pot becomes too small, typically every 2-3 years. This is best carried out in early spring, at the start of the growing season. Use a slightly larger container with drainage holes and a highly free-draining substrate.

Like all species of the genus, Euphorbia lactea cv. White Ghost f. cristata produces a white latex that may be irritating to skin and mucous membranes. It is therefore advisable to handle the plant with care during pruning or repotting.

This species is generally resilient; however, excess moisture and waterlogging may, in some cases, lead to root or stem rot, which can be particularly harmful to grafted specimens. Among pests, mealybugs may occur, and more rarely mites, which tend to settle along the ribs or within the folds of the crests.

When grown indoors, it is advisable to rotate the pot periodically, as the distinctive variegation makes the plant more sensitive to light coming from a single direction. If exposed consistently from one side, it tends to lean towards the light source. Rotating the pot by about a quarter turn every 1-2 weeks helps distribute light more evenly and promotes a more balanced growth.

Propagation:

Propagation of this form occurs almost exclusively through grafting, a method made necessary by the plant’s reduced chlorophyll content and altered growth habit. Propagation by cuttings is unreliable and rarely successful, while seed propagation is not feasible, as neither the crested form nor the variegation are genetically stable. Grafting is typically carried out onto vigorous Euphorbia rootstocks, which ensure adequate nutrient supply and greater long-term stability.

Curiosity:

During the summer months, the plant may produce tiny white or pinkish leaves at the tips of the crests. These are short-lived structures that fall quickly, leaving the plant typically leafless.

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