Christmas Cactus root rot

Persistent limp segments over wet mix can indicate damaged roots. Unpot the plant, remove roots that collapse, and discard decomposed medium.

If the base is sound

Replant in a clean, modestly sized pot with a loose mix suited to forest cacti. Keep the base at its previous depth and the medium lightly moist, with all runoff drained. Let the upper layer begin drying between waterings.

If rot reaches the base

Take a short section of firm green segments beyond the damage. Let the cut end form a dry seal, then insert it shallowly into barely moist propagation mix. Keep warm in indirect light. A rooting forest cactus cutting should not sit in water or be kept dry indefinitely.