Root and rhizome rot from overwatering
Check trapped water, drainage and the condition of the base. Wet mix alone does not identify a pathogen, but soft, collapsing tissue or a bad smell needs prompt attention. Do not keep watering a saturated pot.
Inspect gently rather than squeezing healthy tissue. Retain firm roots and rhizome tissue; remove clearly decaying areas with clean tools if needed. Colour alone is not a reason to cut. Repot viable sections in fresh, freely draining mix and a pot suited to the remaining roots. Extensive decay needs specialist advice; drying the pot cannot restore tissue already rotted.
Poor drainage or the wrong soil
Check for water trapped in an outer pot, obstructed holes or compacted mix. Drying speed varies with pot size, light and temperature; a fixed four- or five-day test is not reliable.
Use a freely draining mix and pot. If the base is already collapsing, inspect the tissue as well: changing the container alone does not remove decay.
Cold combined with wet soil
Review cold exposure, especially near glass or an unheated doorway. Cold injury and decay can overlap in appearance. Move the plant to suitable stable warmth, without direct heater airflow, and match watering to the slower drying of cooler conditions.
Physical damage at a single point
A knock or crease can damage one leaf. Photograph the area and check whether it stays localised. A spreading soft lesion is not merely cosmetic; remove clearly decaying tissue with clean tools and inspect the base if deterioration continues. A firm old scar may be left alone.
Keep a short care record
Photograph the whole plant and any damage, and note moisture checks and recent changes. Compare later growth rather than expecting an old scar to disappear. Continuing collapse, expanding lesions or extensive decay deserves specialist help.
Reference material
Reference material consulted for this independently written guide. The publishers listed have not reviewed or endorsed it.
- NC State Extension — snake plant
- University of Maryland — watering
- University of Maryland — symptom checks
- University of Maryland — root rots