How to prune spider cactus

Any time, only when damage or rot is present. Use a sharp, sterile blade to excise dead or rotted sections, cutting back to firm, healthy tissue. Dust the wound with powdered sulfur if rot is present, then allow to callous for several days in a dry, shaded location.

Rarely — only when rot or dead tissue appears. Spider Cactus (Gymnocalycium saglionis) is a large, solitary globe that needs no routine pruning. It does not produce offsets and shapes itself naturally. Only remove dead or rotted tissue using a sterile blade. Allow any cut to callous thoroughly in a dry, ventilated spot before normal care resumes.

Use a sharp, sterile blade to excise dead or rotted sections, cutting back to firm, healthy tissue. Dust the wound with powdered sulfur if rot is present, then allow to callous for several days in a dry, shaded location.