Quick answer: Root rot is damaged, dying root tissue commonly associated with prolonged wet conditions and poor oxygen around the roots. Confirm it by inspecting moisture, odor, stems, and roots; then remove failing tissue and correct the environment that caused it.
Recognize the warning pattern
Possible signs include yellowing leaves, sudden wilting in wet soil, a soft stem base, slow growth, leaf drop, and potting mix that stays wet unusually long. One yellow leaf is not proof, so consider the pattern across the plant.
A healthy root is generally firm. Color varies by species and potting material, but rotten roots are often soft, hollow, dark, or foul-smelling. If the plant is declining rapidly in wet mix, inspect rather than adding more water.
Remove the plant carefully
Slide the root ball out while supporting the stems. Loosen saturated or decomposed mix gently and rinse only when needed to see the roots. Use clean scissors to remove tissue that is clearly mushy or dead.
Do not remove every stained root simply because it is brown. Bark, peat, and fertilizer can discolor healthy roots. Texture and odor are more useful than color alone. Clean tools between cuts and wash the old container before reuse.
Choose an appropriate recovery pot
Use a clean container with drainage, sized to the remaining healthy root system. A severely reduced root system belongs in a smaller pot because a large volume of unused mix stays wet longer.
Fill with a fresh, airy blend suitable for the species. Set the plant at its previous depth, settle the mix without compacting it tightly, and allow excess water to drain. Do not add rocks to the bottom as a substitute for a drainage hole.
Adjust care after repotting
Place the plant in suitable light and stable temperatures. Avoid heavy fertilizer while damaged roots recover. Water according to the new pot size and root mass rather than the old schedule; the timing may change substantially.
Some leaf loss can continue because roots and foliage are temporarily out of balance. Judge recovery by firm stems and new growth. If the base continues to soften, take healthy cuttings when the species can be propagated that way.
Prevent root rot from returning
Match the plant to the available light, use drainage, empty cachepots and saucers, and check the mix before watering. Low light, cool temperatures, oversized containers, and compacted soil all slow drying.
Track how long each pot stays wet. If it remains saturated for many days, improve light or airflow where appropriate and reassess the soil structure and pot size before the next watering.
Frequently asked questions
Can a plant recover from root rot?
Yes, when enough healthy root or stem tissue remains and the cause is corrected. Severe stem-base rot may require propagation.
Should I use hydrogen peroxide?
It is not a substitute for removing dead tissue and correcting wet conditions, and incorrect concentrations can damage roots.
Do rocks at the bottom improve drainage?
No. A drainage hole and suitable potting mix are more effective. A rock layer can leave the saturated zone higher in the pot.
When should I water after repotting?
That depends on the species, remaining roots, and moisture of the new mix. Avoid keeping a compromised root system continuously wet.
Keep learning
Follow our detailed repotting guide, learn the care fundamentals, and browse houseplants.
How to monitor a recovering plant
After treatment, use the plant's stability and new growth as the main measures. Photograph it after repotting, note the date and moisture level, and resist pulling it from the pot repeatedly. Disturbing fragile new roots can delay recovery. Keep the foliage clean and inspect it for pests while the plant is stressed.
Water may move through the new mix differently from the old soil, so relearn the pot's weight. A smaller root system consumes less water and may need a longer interval. Do not interpret every aging leaf as renewed rot. Concern is warranted when wet soil, softening stems, foul odor, and continuing rapid decline appear together. If only one healthy stem remains, research whether the species can be propagated as insurance.
Clean the surrounding setup
Wash saucers and cachepots, discard decomposed mix, and clean tools before using them on another plant. Check nearby pots that shared the same watering routine. Root rot itself is not always contagious, but the conditions that caused it may exist throughout a grouped collection.