How to prune astrophytum coahuilense

Spring if rot removal is ever necessary. Excise rotted tissue with a sterilised sharp knife, cutting to clean, dry flesh. Dust with sulphur and keep the plant in a warm, dry, bright spot until the wound callouses fully.

Rarely; only when rot or physical damage occurs. Astrophytum coahuilense (Coahuila star cactus) is a solitary globe that never needs pruning. Its distinctive ribbed form develops entirely on its own. Remove only dead or mushy tissue if rot occurs, cutting back to healthy flesh with a sterile blade. No shaping or stem-cutting is appropriate.

Excise rotted tissue with a sterilised sharp knife, cutting to clean, dry flesh. Dust with sulphur and keep the plant in a warm, dry, bright spot until the wound callouses fully.