Pocket BotanistCheck these first
- Feel the soil to see if it is waterlogged or muddy.
- Check the base of the stems for soft or discolored tissue.
- Inspect the drainage holes to ensure they are not clogged.
Likely causes
Overwatering
Most likelyHow to tell: The leaves turn yellow and the stems look mushy or dark at the soil line. The plant will look wilted even if the soil is very wet.
What to do: Stop watering immediately and let the top 2 inches of soil dry out. If the plant is in a pot, ensure the drainage holes are not blocked.
Poor Drainage
PossibleHow to tell: Water pools on the surface of the soil for a long time after watering. The roots will appear brown and slimy rather than firm and white.
What to do: If the plant is in the ground, amend the soil with compost to improve drainage. If in a container, repot the plant into fresh, well draining potting mix.
When to worry
If the base of the stem has turned black or mushy, the rot has likely reached the crown and the plant may not recover. Yellowing leaves are often the first sign of trouble.
Stopping it coming back
Always check the soil moisture before watering. Ensure your sweet peas have excellent drainage and never let them sit in standing water.
Not sure which one it is? Photograph your sweet pea.
This page lists the usual causes. Pocket Botanist looks at your actual leaf and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
Questions people ask
- Can I save a plant with root rot?
- If the damage is mild, you can save it by letting the soil dry out and pruning away dead roots. If the stem is mushy, it is usually best to start over.
- How often should I water sweet peas?
- Water every 2 to 3 days depending on the heat. Always touch the soil first; if it feels damp, wait another day.
More problems with Sweet Pea
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.