Synonyms:

Cereus Peruvianus spiralis
Cereus Peruvianus tortulosus

Habitat:

Cereus forbesii cv. spiralis is an ornamental cultivar resulting from a mutation selected in cultivation and not found in nature. It derives from Cereus forbesii, a species native to South America and distributed across the arid and semi-arid regions of Argentina, Bolivia, and Paraguay. In its natural habitat, the species grows in open, bright environments such as rocky slopes and sandy plains, on poor, well-drained soils. The climate is dry, with limited rainfall and marked temperature fluctuations.

Description:

The genus Cereus derives from the Latin cereus, meaning “waxy” or “candle-like”, in reference to the glossy, compact appearance of the stems. The specific epithet forbesii honors James Forbes, a 19th-century Scottish botanist and plant collector active in the study and dissemination of exotic plants. The term spiralis, of Latin origin, means “spiral” and clearly describes the distinctive helical growth of the stem, an ornamental trait that sets this cultivar apart from the species type.

Cereus forbesii cv. spiralis belongs to the genus Cereus and to the family Cactaceae. It is immediately recognizable for its spiral, columnar growth habit, with the stem naturally twisting around itself in a harmonious helix. The stem is upright and fleshy, green to blue-green in color with a slightly waxy surface, and marked by deep, narrow ribs that follow the spiral pattern. The areoles are sparse, white and woolly, bearing generally short, needle-like spines of a yellow-brown color, evenly distributed along the ribs. In cultivation, especially when grown in containers, it can reach considerable heights, often exceeding 1.5 meters (5 feet).

Flowering is a rare and striking event, particularly in home cultivation, and occurs mainly in summer on mature specimens. The flowers are large, funnel-shaped and nocturnal, with waxy petals that are white to pale pink. They open suddenly at sunset, releasing a delicate fragrance, and wither by the following morning. The flowers emerge from the areoles on the upper part of the stem and, if pollinated, may develop into fleshy, generally globose fruits that turn reddish at maturity and contain numerous small, dark seeds.

Cultivation:

This plant grows at a fairly fast rate and is easy to cultivate under the right conditions.

It prefers a light, very well-draining soil that prevents any water stagnation. A cactus mix with a predominantly mineral composition is ideal, enriched with coarse sand, pumice, or lava rock, while the organic component should be kept to a minimum.

During the growing season, from spring through summer, water moderately, approximately every 7-10 days, allowing the substrate to dry out completely between waterings. In autumn, watering should be gradually reduced and almost completely suspended during winter.

It thrives in full sun and grows best in very bright positions, preferably with southern or western exposure. Indoors, it should be placed on a sunny windowsill, ensuring at least 5-6 hours of direct sunlight per day. After winter, it is advisable to acclimate the plant gradually to direct sun to prevent sunburn. It tolerates heat well but is sensitive to frost; minimum temperatures should not drop below 5-7 °C (41-45 °F). A cool, dry winter period around 10 °C (50 °F) promotes proper dormancy and future flowering.

During the active growing phase in spring and summer, fertilize every 4-6 weeks using a cactus-specific fertilizer low in nitrogen. Fertilization should be completely stopped during the colder months, in line with the plant’s natural dormancy period.

Repotting is carried out every 2-3 years, preferably in spring, using a slightly larger pot and a well-draining substrate.

This plant is not considered toxic to humans or pets. However, it should be handled with care, as the spines may cause mild irritation upon direct contact.

It is a generally resilient cactus that rarely develops problems when grown correctly. The main issues are related to excessive moisture, which can lead to root or stem rot. Under unfavorable conditions, especially in enclosed or poorly ventilated environments, it may be affected by pests such as mealybugs and spider mites.

A useful tip is to closely observe the stem, as it provides a good indication of the plant’s health. An excessively pale or washed-out color indicates that Cereus forbesii cv. spiralis is not receiving enough light and requires a brighter exposure.

Propagation:

This species is propagated mainly by stem cuttings. Cuttings should be taken from healthy portions of the plant and left to dry for several days to allow the cut surface to callus, then placed on a dry, well-draining substrate. Rooting generally occurs within a few weeks, keeping the soil slightly moist and the plant in a bright location but out of direct sun. Propagation by seed is also possible by sowing the seeds just below the surface of the substrate and providing a humid microclimate to encourage germination; during the first months, the soil should be kept evenly moist.

Curiosity:

In the early stages of growth, the plant shows a regular development, with straight ribs and a stem similar to that of the species type. Over time, generally once it reaches about 10 cm (4 in) in height, the ribs begin to gradually twist around the stem, giving rise to the characteristic spiral growth.

Official Web Site:
www.giromagi.com

Italian Blog:
www.giromagicactus.com

Tips:
Read our advice