Symptoms
- check_circleSoft, waterlogged-feeling stems at the base
- check_circleBlack or dark brown discolouration at soil level
- check_circlePlant collapsing or easily pulled from the soil
- check_circleFoul smell from the stem or soil
- check_circleStems that collapse or snap easily
Causes
- arrow_rightOverwatering causing root rot extending into stems
- arrow_rightDamping off disease in seedlings
- arrow_rightBotrytis (grey mould) in cool, wet conditions
- arrow_rightBacterial stem rot — especially in succulents
- arrow_rightPhysical damage providing entry for pathogens
How to Diagnose
Probe the stem at the base — is it firm or does it give under light pressure? If soft or mushy, check the roots. Examine how far up the mushy tissue extends. If it's limited to the very base, some stems may be salvageable via cuttings from healthy tissue above.
Treatment
Remove all mushy tissue, cutting back to firm, healthy stem. If the rot is at the base, take stem cuttings from healthy growth above, let them callous, and propagate. For succulents: behead the healthy rosette above the rot, let dry, and replant. Severely affected plants may not be saveable.
Prevention
Never overwater. Use pots with drainage holes and well-draining compost. Don't let water pool at the base. Improve air circulation. For seedlings: sow thinly and don't overwater to prevent damping off.
Affected Plants
Upload a photo for AI-powered diagnosis and a personalised treatment plan.
Try Premium Free