Root Rot and Mushy Plant Stems: Signs and Fixes
Last reviewed: October 2026
Quick answer
A plant that wilts while the soil is wet, or has a soft, mushy stem base, may have root rot caused by soil fungi. Check the roots before you water again and cut back on watering. Badly rotted plants are often best thrown out.[1][2]
Causes and how to tell them apart
Wilting even though the soil is wet[1][2]
How to tell: Wilting in wet soil is a classic root rot sign. Dry soil points to thirst instead, so feel the potting mix before you add water.
Mushy brown roots[2][1]
How to tell: Slide the plant out of the pot. Healthy roots are firm and white with many fine feeder roots. Rotted roots are mushy and brown or reddish, and may smell bad.
Stem base turning black, brown or mushy[3]
How to tell: Some root rot fungi also attack the lower stem. A mushy, dark stem base with yellowing lower leaves fits Phytophthora root rot.
Reddish brown threads on the stem and roots[3]
How to tell: Rhizoctonia likes warm, moist conditions. Look for coarse reddish brown threads that can look like spider webs on stems and roots.
Wet, poorly drained potting mix[2][4]
How to tell: The fungi thrive in wet, poorly drained mix. Check that the drainage hole is not clogged by roots and that the pot is not sitting in water.
What to do, step by step
- Before you add water, check the roots and the moisture of the potting mix. Wilting can look like thirst but be rot.[2]
- Reduce soil moisture. Give the plant what it needs to grow, but do not overwater, and never let it sit in drainage water.[1]
- Keep the sick plant away from healthy ones.[3]
- If you keep the plant, repot it in a clean pot with fresh, sterile potting mix. Do not reuse the old mix.[3][1]
- Use a pot with drainage holes. Do not put rocks or gravel at the bottom, because they can hurt drainage.[1]
- If the plant is badly infected, throwing it out is often the best choice. Take cuttings only from healthy tissue.[1][3]
- Skip fungicide sprays. Wisconsin extension does not recommend them for houseplant root rot.[1]
How to prevent it
- Water by what each plant needs, not by a fixed schedule.[2]
- Choose a well-drained potting mix and avoid excess watering.[2]
- Use pasteurized commercial potting mix, not garden soil, which often carries root rot fungi.[1]
- Inspect new plants before placing them near your others.[3]
- After handling a rotted plant, clean tools, work surfaces and clay pots with a disinfectant. Do not reuse plastic pots.[1]
Not sure what is wrong? Scan your plant.
Scan your plantFrequently asked questions
Why is my plant wilting when the soil is wet?
Roots damaged by root rot cannot take up water, so a plant can wilt in wet soil. Pull the plant from the pot and look for soft, brown roots instead of firm, white ones.[1][2]
Why is my plant's stem turning mushy at the soil line?
Some root rot fungi, such as Phytophthora, can turn the lower stem black, brown or mushy. Check the roots too, and cut back on watering.[3]
Can a plant recover from root rot?
It depends on how far the rot has gone. Wisconsin extension says throwing the plant out is often the best option, and Maryland extension says to throw away severely infected plants. If you keep it, reduce soil moisture.[1][3]
Related plant problems
Sources
- University of Wisconsin-Madison Extension: Root Rots on Houseplants
- Iowa State University Extension: Root Rots of Houseplants
- University of Maryland Extension: Root Rots of Indoor Plants
- NC State Extension: Watering but Not Overwatering Houseplants
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Sources: the university extension and horticultural society pages listed above. Last reviewed October 2026.