Grafted Moon Cactus Rot: Scion Rescue via Regrafting Only

Anatomy Recap

Moon cactus = colorful mutant scion (Gymnocalycium) grafted onto green rootstock (Hylocereus). Rootstock rotted = base dead.

Regraft scion: Cut scion cleanly, graft onto new Hylocereus or Myrtillocactus rootstock. Advanced skill.
Discard: Scion cannot root on own (no chlorophyll).
Rootstock top: If any green rootstock remains near scion, callus and root as jungle cactus.

Overwatering + cool temps = basal rot. Graft union is rot highway.

Cactus: Pesticide Poisoning Rescue: Columnar Cactus Exposed to Bedbug Treatment; Barrel Cactus Rotting from Top Down After Moving Indoors: Can It Be Saved?; Rescuing a Rotting Cactus: Base Rot Treatment and Propagation; Moon Cactus Scion Death: Rootstock Takes Over with Jungle Cactus Traits; Grafted Cactus Basal Rot: Top Scion Likely Lost Too; Tall Cactus Basal Rot: Thin Species = Cut and Root, Fat Species = Lost; Euphorbia Cold Damage: Fast Rot Spread, Basal Damage = Likely Loss; Northeast Indoor Cactus Basal Rot: Humidity-Adjusted Watering, Top Cutting Rescue; Aloe Vera Brown Base, Short Roots & Slow Growth: Diagnosis; Madagascar Palm (Pachypodium) Losing Leaves in Montreal

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