Scientific Name
Cereus forbesii f. spiralis
Common Name(s)
Contorted Cereus, Spiraled Cereus, Twisted Cereus
Synonym(s)
Cereus peruvianus f. spiralis, Cereus validus f. spiralis
Scientific Classification
Family: Cactaceae
Subfamily: Cactoideae
Tribe: Cereeae
Genus: Cereus
Origin
Cereus forbesii f. spiralis is a questionable monstrose form of Cereus forbesii, native to South America, specifically Argentina, Bolivia, and Paraguay. In the early 1980s, a few branches from the original plant were imported into Europe at a very high price. The original clone, known as the "short-spined clone," has strong grey stems covered with a dense coating of pruina and short spines. However, most of the plants available on the market today are seed-grown hybrid specimens, likely resulting from a cross between Cereus forbesii f. spiralis and Cereus repandus (formerly known as Cereus peruvianus) or Cereus stenogonus. These hybrids are typically darker blue-green in color and have longer spines.
Description
Cereus forbesii f. spiralis is a striking cactus with numerous columnar stems that have a unique, spiraling growth habit. The stems have short spines along the ribs and can grow up to 16.5 feet (5 m) tall and 5 inches (12.5 cm) in diameter.
This cactus blooms profusely during the summer. The flowers, which range in color from white to reddish, can reach a length of 8 inches (20 cm) and a diameter of 5 inches (12.5 cm). They are followed by ornamental red fruits that contain lilac pulp and tiny black seeds.
Hardiness
USDA hardiness zones 9a to 11b: from 20°F (-6.7°C) to 50°F (10°C).
How to Grow and Care
Like most cacti, Cereus are fairly low-maintenance and hardy. Ensure they receive sufficient water without becoming waterlogged, especially during the summer, and fertilize them for optimal results. If the roots have become black or overly soft, the cactus could be experiencing root rot. Cut away the affected parts and replant them. Most gardeners interested in cacti should be able to cultivate these without much problem.
It may become necessary to repot your Cereus if it outgrows its container. If so, ensure the soil is dry, then remove the pot. Knock away old soil, prune away rotted or dead roots, then replace it in a new pot and backfill it with fresh soil. Ensure that cacti planted in new pots are not overwatered, as this can lead to root rot. It should be left dry for about a week and then watered lightly.
These cacti propagate quite easily from cuttings. Sever a branch and replant in moist, well-drained soil.
Learn more at How to Grow and Care for Cereus.
Links
- Back to genus Cereus
- Succupedia: Browse succulents by Scientific Name, Common Name, Genus, Family, USDA Hardiness Zone, Origin, or cacti by Genus
Photo Gallery
Click on a photo to see a larger version.
