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Root Rot

Root rot is a fungal disease caused by Phytophthora, Pythium, or Fusarium species — all thriving in consistently wet, anaerobic soil. It is almost always caused by overwatering combined with poor drainage, and is the leading cause of houseplant death.

Symptoms

  • check_circlePlant wilting despite wet or moist soil
  • check_circleYellowing leaves, especially lower ones
  • check_circleBlack or brown, mushy stem base
  • check_circleFoul, sour smell from the pot
  • check_circleRoots are brown, black, or soft when unpotted

Causes

  • arrow_rightOverwatering — soil stays wet for too long
  • arrow_rightPot with no drainage holes
  • arrow_rightDense, waterlogged soil that doesn't aerate
  • arrow_rightLarge pot relative to plant size — excess wet soil
  • arrow_rightSaucer filled with standing water

How to Diagnose

If you suspect root rot, unpot the plant. Healthy roots are white to cream and firm. Rotted roots are brown to black, soft, mushy, and may smell. The severity determines the treatment approach.

Treatment

Remove all rotted roots with clean scissors. Dust cut ends with cinnamon or powdered charcoal (natural antifungals). Let roots air-dry 30–60 minutes. Repot into fresh, well-draining compost in a clean pot with drainage holes. Don't water for 2–3 days after repotting.

Prevention

Never let pots sit in standing water. Always use pots with drainage holes. Use well-draining compost (add perlite). Water only when the top layer of soil has dried out. Choose an appropriately sized pot — not too large.