Saving a Rotting Coral Cactus: Cut, Callus, and Replant

A coral cactus has stem mold/rot. Owner asks if cutting above the rot and replanting the top works.

Procedure

1. Cut cleanly above the rotted section with a sharp knife.
2. Let the cutting air-dry 24 hours to callus.
3. Use cactus-only potting mix (not multi-purpose). Or make 2:1 peat moss:perlite.
4. Plant in a 6-inch or smaller terra cotta pot, 1 inch deep.
5. Provide warmth and strong sunlight.

Do not use Miracle-Gro "cactus, palm & citrus" mix—it retains too much moisture.