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Root Rot Signs: Catch It Before It Is Late

Root Rot Signs: Catch It Before It Is Late

By James Wilson · September 26, 2026

What Is Root Rot?

Root rot is a condition where plant roots decay due to prolonged exposure to waterlogged soil. Fungal pathogens like Pythium, Phytophthora, and Fusarium thrive in anaerobic (oxygen-depleted) conditions. Once established, root rot can kill a plant within days.

Early Warning Signs

Above-Ground Symptoms

Wilting despite moist soil: The plant looks thirsty even after watering
Yellowing lower leaves: Starting from the bottom up
Leaf drop: Both old and new leaves falling off
Stunted growth: New leaves are smaller than usual or stop appearing
Soft, mushy stems: Especially at the soil line

Root Inspection

Gently remove the plant from its pot. Healthy roots are firm and white or light tan. Rotting roots are:

Dark brown or black
Mushy and slimy when touched
Emitting a foul, sour smell
Falling apart easily

Emergency Rescue Steps

1. Remove the plant from waterlogged soil immediately

2. Rinse roots gently under running water to remove soil

3. Trim away all dark, mushy roots with sterilized scissors

4. Dip remaining healthy roots in a 3% hydrogen peroxide solution for 30 seconds

5. Repot in fresh, well-draining soil in a clean pot

6. Water lightly and place in bright, indirect light

Prevention

Use pots with drainage holes — always
Never let plants sit in standing water
Use well-draining potting mix appropriate for the plant type
Water only when the top 1-2 inches of soil are dry
Add perlite or pumice to improve soil drainage