Root rot happens when roots sit in soggy, airless potting mix long enough for them to suffocate and for water mold fungi to move in. The signs are wilting or yellowing even though the soil is wet, a sour or swampy smell from the pot, and roots that are brown, black, or mushy instead of firm and white or tan. To save the plant, unpot it, rinse off the old mix, cut away every soft root with clean shears, and repot into fresh, fast draining mix in a pot with drainage holes, then water lightly. Plants caught early, with at least a third of their roots still firm, usually recover. Prevention comes down to drainage, the right pot size, and watering only when the mix has dried.
Signs of root rot
- Leaves wilt or droop while the soil is still damp.
- Lower leaves yellow and drop, often several at once.
- The mix smells sour, musty, or like a swamp.
- The base of the stem feels soft or turns dark.
- Fungus gnats are thriving in the constantly wet top layer.
- The plant wobbles in the pot because the roots no longer anchor it.
The only way to confirm it is to look. Tip the plant out of the pot and check the roots. Healthy roots are firm and pale. Rotted roots are dark, slimy, and the outer layer slides off when you pinch it, leaving a thin string behind.
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- Unpot and clean. Ease the plant out and gently shake or rinse away the old mix under lukewarm water so you can see every root.
- Trim. Wipe shears with rubbing alcohol, then cut off every soft, dark root back to firm, pale tissue. Wipe the blades again between cuts if the rot is heavy.
- Thin the top. If you removed a large share of the roots, trim back some of the foliage too, so the smaller root system has less to support.
- Repot fresh. Use new potting mix, opened up with perlite for plants that like quick drainage. Do not reuse the old mix. Choose a clean pot only as large as the remaining roots, with at least one drainage hole. Scrub and rinse an old pot before reusing it.
- Water lightly and wait. Water once to settle the mix, then let the top 2 inches dry before watering again. Keep the plant in bright, indirect light and skip fertilizer for a month, since new roots burn easily.
If almost every root is gone, take cuttings from healthy stems and root them instead. Many vining and cane plants regrow quickly from cuttings, so a rotting pothos or philodendron can live on even if the original root ball cannot.
Why root rot starts
- No drainage hole. Decorative pots without holes trap water at the bottom. Keep the plant in a plain nursery pot and set it inside the decorative one, emptying any water that collects.
- Pots that are too large. A big volume of mix around a small root ball stays wet for days. Move up only 1 to 2 inches in diameter when repotting.
- Dense or old mix. Potting mix breaks down over the years and holds more water. Repot every two to three years.
- Watering on a schedule. Plants use far less water in the darker months. Water by checking the mix, not by the calendar.
- Cold, wet roots. Pots on cold floors or windowsills dry slowly. Raise them on pot feet or a plant stand.
How to prevent root rot
Check moisture with a finger or a moisture meter before each watering, and water thoroughly only when the top inch or two is dry. Empty saucers after 15 minutes. Match the mix to the plant: succulents and cacti want gritty mix, while most tropical foliage plants do well in a standard mix with added perlite or bark. Give plants bright light, which helps them use water faster and keeps the mix from staying wet.
Safety notes
Wear gloves when handling rotting roots, and wash your hands after. Many common houseplants are toxic to pets if chewed, so bag trimmings and old mix right away. If a pet chews this plant, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435. For a child, call Poison Control at 1-800-222-1222.
Bottom line
Wet soil plus wilting means check the roots. Trim the rot, repot into fresh mix in a pot with drainage, and water only when the top of the mix dries. Catching it early saves most plants.
Related reading
- When to repot houseplants in winter
- Soil moisture meters for houseplants in winter
- Fungus gnats on houseplants: how to control them
- Yellow leaves on houseplants: causes and fixes
- Jade plant care and fixing mushy leaves
- ZZ plant care and rotting rhizomes
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