Pocket Botanist
Check these first
- Inspect the undersides of the leaves for small white insects.
- Touch the soil to ensure it is still fully saturated with water.
- Check the ambient temperature to see if it is exceeding 75 degrees.
Likely causes
Whitefly infestation
Most likelyHow to tell: You will see tiny white insects flying up when you brush the leaves. Check the undersides for small white specks or sticky residue.
What to do: Spray the leaves with a gentle stream of water to knock them off. Apply insecticidal soap or neem oil every 5 to 7 days until the population is gone.
Heat stress
PossibleHow to tell: The leaves look wilted and curled even though the soil is wet. This happens when temperatures climb above 75 degrees Fahrenheit.
What to do: Move your container to a spot with more shade during the hottest part of the day. If growing outdoors, use a shade cloth to keep the temperature cooler.
Find out what's wrong with your watercress
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
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When to worry
Worry if the curling spreads to the entire plant or if you see yellowing alongside the curls. A single curled leaf is often just minor damage.
Stopping it coming back
Keep your watercress in a cool, shaded spot and monitor the undersides of leaves weekly for early signs of pests.
Keep your watercress healthy from here
Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.
Questions people ask
- Can I eat leaves that are curling?
- It is best to avoid eating leaves that are heavily infested with whiteflies. If the curling is just from heat, the leaves are safe to eat but may taste bitter.
- Does watercress need to be in water to stop curling?
- Yes, watercress must have its roots submerged at all times. If the soil dries out even slightly, the plant will stress and the leaves will curl.
More problems with Watercress
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.