The Cereus Forbesii 'Spiralis' is a rare cultivar of the Cereus forbesii prized for it's spiral growth habit. When grown from seed, the Spiralis won't start twisting until it reaches a height of 3-4" tall. There remains confusion around the true identity of the 'Spiralis' cultivar and is believed to be a cross-pollination between the Cereus forbesii and the Cereus peruvianus.
The Spiralis should be grown in a mix of direct and indirect sun and dry conditions. During the grow season, it should be watered thoroughly, when the soil is dry. During cold, winter months, it should be left to dry between waterings and watered sparingly. Also check your local weather before watering indoor arid plants in winter. It is best to water if there is a stretch of sunshine in the forecast.
The spiralis will bloom big, beautiful white blossoms between June and August. Ensure the light requirements are met and increase watering. The blossoms only open at night and span 2-4" wide. Spiralis can be fed with a cactus fertilizer once per month, spring through fall.