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Germination time: 10-15 days, temperature germination: 15-25 degrees Celsius. 'Cereus' typically doesn’t like direct afternoon sunlight and should be in partial shade through the hottest hours. Cereus forbesii is a branching shrubby or treelike cactus, with blue-green cylindrical-columnar stems with long spines. It can reach a height of about 2 m. It bears large white or pale pink funnel-shaped flowers that are reddish outside, in Spring to early Summer. Water thoroughly when soil is dry to the touch. Less water during the cold winter months to prevent root loss.