Moon Cactus Rootstock Rot: Scion Regraft Only Option, Myrtillocactus Best Rootstock

Graft Failure Reality

Rootstock (Hylocereus) rotted from overwatering + sun change. Scion (Gymnocalycium) cannot live independently.

Only Rescue: Regraft

1. Cut scion cleanly.
2. Prepare new rootstock (Myrtillocactus geometrizans = best).
3. Match vascular rings; secure with rubber bands.
4. Humidity dome 2 weeks.

If Not Grafting

Discard. Learn: moon cacti need less water than rootstock suggests. Water by scion firmness, not schedule.