Cereus forbesii "spiralis"

A green screw in the sky!
 

Description: A few branches from the original plant were imported in Europe around 1980 for a very hight price. The original clone was characterized by stong grey stems covered with a dense pruina coating and with short spines (Also known as "short spined clone"), but nowadays almost all the plant on the trade are seed grown hybrid specimens derived from cross pollination with (presumably) Cereus peruvianus, they are usually a darker blue-green colour with longher spines.
It is a heavy bloomer.
 

The original plant from Brazil.
(Photo of unknown origin from the web)

The so called "Short spined" form.
This plant is (presumably) a clone  derived from vegetative propagation of the first original plant.

an irregular growing specimen

a very spiny form

A seedling.

A cutting.

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Synonyms:

• Cereus peruvianus forma spirale
• Cereus peruvianous tortulosus

This is a very nice plant. The ribs grow in a spiral

In the beginning the young seedlings have ordinary straight ribs, but start to develop spirals when they reach the height of about 10 cm.

Culture: Cereus forbesii are of easy culture and are cold intolerant. Make sure they are not exposed to freezing temperatures ( Hardy to -2°C) or they may die. They need a well drained soil mix. Water regularly in summer but allow to dry fully before watering again. During the winter months they should be rather kept dry. Since they are rapid growers, they need plenty of space for their roots.  Repotting should be done every other year, or when the plant has outgrown its pot. Sun Exposure: Light shade when young, full sun later.

Propagation: From cuttings in spring (let them dry till the ends callous well). Then replant them in fresh cactus soil that is ever so slightly moist, and keep them that way till they root), or by Seeds (Seeds should be sown in a well-drained soil mix. Surface sowing is the best; seeds germinate in 14-28 days at 25° C .