How to prune totem pole cactus

Spring, only if basal rot requires removal. If basal rot is present, use a sterile saw or knife to cut above the rot line into clean, green tissue. Allow the cut surface to callous in a warm, dry, bright location for 1–2 weeks. If the base is salvageable, treat with a systemic fungicide and improve drainage.

Very rarely — only if rot forces intervention. Totem Pole Cactus (Lophocereus schottii 'Monstrosus') is a slow-growing columnar cactus grown entirely for its sculptural monstrose form. It must not be pruned or shaped — cutting disrupts the mutated growth and scars permanently. The only valid reason to cut is to remove a section that has rotted at the base.

If basal rot is present, use a sterile saw or knife to cut above the rot line into clean, green tissue. Allow the cut surface to callous in a warm, dry, bright location for 1–2 weeks. If the base is salvageable, treat with a systemic fungicide and improve drainage.