Root Rot in Houseplants: Causes, Signs & How to Fix It

Root rot is one of the most common — and most deadly — problems for houseplants. The frustrating part? By the time you notice symptoms above the soil, the damage below is often already severe. Here's everything you need to know to identify, treat, and prevent root rot.

What Is Root Rot?

Root rot is a condition where a plant's roots decay due to prolonged exposure to waterlogged soil. It's caused by two main factors: overwatering and poorly draining soil. When roots sit in standing water, they're deprived of oxygen and become susceptible to fungal pathogens like Phytophthora and Pythium, which accelerate the decay.

Signs of Root Rot

• Yellowing leaves — especially lower leaves turning yellow and mushy
• Wilting despite wet soil — the plant looks thirsty even though the soil is damp
• Soft, mushy stems at the base of the plant
• Foul smell coming from the soil or roots
• Brown, black, or mushy roots when you unpot the plant (healthy roots are white and firm)
• Rapid leaf drop or overall decline

How to Fix Root Rot

1. Remove the plant from its pot. Gently shake off the soil and inspect the roots.
2. Trim the affected roots. Using clean, sterilized scissors, cut away all brown, black, or mushy roots. Only firm, white roots should remain.
3. Treat with hydrogen peroxide. Rinse the remaining roots with a diluted hydrogen peroxide solution (1 part 3% H2O2 to 2 parts water) to kill any remaining fungal spores.
4. Let the roots dry. Allow the roots to air dry for 30-60 minutes before repotting.
5. Repot in fresh, well-draining soil. Never reuse old soil — it may still contain fungal pathogens. Choose a mix with good drainage like a chunky aroid mix.
6. Choose the right pot. Use a pot with drainage holes. Terracotta pots are ideal as they allow moisture to evaporate through the walls.
7. Water correctly going forward. Allow the top 1-2 inches of soil to dry out before watering again.

Can a Plant Recover from Root Rot?

Yes — if caught early enough. Plants with mild root rot and some healthy roots remaining can make a full recovery with proper treatment. However, if the majority of roots are affected and the stem is mushy at the base, the plant may be too far gone. In that case, try taking stem cuttings to propagate and save the plant.

How to Prevent Root Rot

• Always use pots with drainage holes
• Use well-draining, aerated soil mixes
• Water only when the top layer of soil is dry
• Empty saucers after watering so roots don't sit in standing water
• Reduce watering frequency in winter when plants grow more slowly