Soft Rot

About this condition

Soft rot is a condition in which the stem or caudex of a plant becomes water-soaked and decays due to bacterial infection (such as Erwinia spp.). It can progress rapidly from wounds or high-humidity conditions, making early response essential.

Common symptoms

• Part of the stem or caudex becomes water-soaked and soft
• The affected area turns brown to black and emits an unpleasant odor
• Symptoms spread rapidly to surrounding tissue within a few days
• Tissue around the affected area collapses and becomes sunken as it breaks down

Common causes

• Bacterial entry through wounds from pruning, pests, or physical injury
• Overwatering during hot, humid periods (rainy season and summer)
• Persistent humid, poorly ventilated growing conditions
• Long-term cultivation in poorly draining soil keeping the root zone constantly wet

Prevention (growing conditions & routine care)

Allow cut surfaces from pruning or physical wounds to dry out promptly and avoid exposing them to humidity. During hot, humid periods, improve ventilation and reduce watering frequency. Regularly inspect the plant, paying close attention to the stem and caudex for any early signs of softening or discoloration.

Related guide

When to see a vet

What can a nursery or grower do?

Consulting a specialty nursery or experienced caudex grower for assessment and guidance is the most helpful approach when soft rot is suspected. Documenting the affected area with photographs and sharing them with a specialist can help obtain specific, practical advice on managing the condition.

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