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Root Rot

Disease

Root rot is a destructive condition caused by waterlogged soil that suffocates plant roots and invites fungal pathogens. It is a serious issue because it destroys the plant's ability to absorb water and nutrients, often leading to rapid decline.

Root Rot on a plant
Photo: Ken-ichi Ueda, CC BY

Symptoms by part

Roots

Roots turn soft, mushy, and dark brown or black instead of firm and white. They may easily pull away from the plant, leaving behind only thin, stringy fibers.

Whole plant

The plant appears wilted even when the soil is moist, and leaves may turn yellow or drop prematurely.

Causes

  • Consistently soggy soil that prevents oxygen from reaching the roots.
  • Poor drainage in pots or garden beds.
  • Overwatering or leaving plants sitting in standing water.
  • Using heavy, non porous soil mixes that hold too much moisture.

Could be confused with

  • Underwatering · Underwatered plants have dry, brittle soil and roots that are firm and light colored, whereas root rot involves wet soil and mushy roots.
  • Nutrient Deficiency · Deficiencies cause yellowing or stunted growth without the mushy root decay or the distinct smell of rot associated with root rot.

Treatment

  1. Gently remove the plant from its container or dig it out of the ground to inspect the root system.
  2. Use clean, sharp shears to trim away all dark, mushy, or decaying roots until you reach healthy, firm tissue.
  3. Wash the remaining healthy roots in a clean water rinse to remove contaminated soil.
  4. Repot the plant into a fresh, well draining potting mix in a clean container with adequate drainage holes.
  5. Place the plant in a spot with bright, indirect light to help it recover without heat stress.

Without chemicals

  • Prune back a portion of the foliage to reduce the plant's demand for water while it regrows its root system.
  • Improve soil drainage by adding perlite or coarse sand to the potting mix.
  • Ensure pots are never left sitting in saucers filled with water.

Preventing it

  • Always use pots with drainage holes.
  • Allow the top inch or two of soil to dry out completely before watering again.
  • Use a light, airy soil mix designed for your specific plant type.
  • Avoid overwatering during cooler or lower light periods when growth slows down.

Season

The warm growing season, when plants are actively drinking and soil moisture levels are most likely to fluctuate.

Spread risk

Moderate

Severity

High

When to act

Act as soon as you notice persistent wilting despite moist soil. If more than half of the root system is mushy or the stem base feels soft, it is best to discard the plant to prevent the spread of pathogens to others.

Think it's Root Rot?

This guide covers the general picture. Pocket Botanist looks at your actual plant from a photo and tells you what's really going on, how serious it is, and what to try first. Identification and a health check are free.

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Questions people ask

Can I save a plant with root rot?
Yes, if you catch it early enough and there is still some healthy, firm root tissue left to support the plant.
Should I fertilize a plant with root rot?
No, avoid fertilizing until the plant shows signs of new, healthy growth, as fertilizer can stress damaged roots further.

Plants it affects

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This guide was generated with AI and is general information, not horticultural advice. Read about how we build these guides.