How to prune pincushion cactus

Only if rot appears — spring or early summer when the plant is actively growing and can recover. If rot is present, excise affected tissue with a sterilised knife, cutting to firm, unblemished flesh. Dust with fungicide powder and leave uncovered in bright, dry conditions for several days before returning to soil.

Rarely — only when rot or significant damage occurs. Pincushion Cactus (Mammillaria crinita) needs no pruning. Its globose to cylindrical body does not produce stems or branches that require cutting. Remove dead or damaged tissue only if rot develops — use a sterile blade, cut back to healthy white flesh, and allow the cut surface to callous in a dry spot.

If rot is present, excise affected tissue with a sterilised knife, cutting to firm, unblemished flesh. Dust with fungicide powder and leave uncovered in bright, dry conditions for several days before returning to soil.