Will my leaves uncurl once the aphids are gone?

The damaged leaves may stay curled, but the new growth should emerge flat and healthy. You can trim off the severely distorted leaves if you prefer.

Is curling a sign of root rot?

Usually, root rot causes yellowing and wilting rather than curling. If the soil smells sour, check the roots for mushy brown sections.

Greater bird's-foot-trefoil: curling leaves

Check these first

Look closely at the curled leaves for tiny insects.
Feel the soil to see if it has dried out too much.
Check if the plant is in a spot that gets too hot in the afternoon.

Likely causes

Aphid Infestation
Possible
How to tell: The leaves look distorted and curled, and you can see small green or black insects hiding in the folds.
What to do: Wash the leaves with a soft cloth and soapy water to remove the aphids. Repeat this every 3 days until the leaves begin to flatten out again.
Heat Stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture, especially if the soil is drying out.
What to do: Increase your watering frequency to ensure the soil stays consistently damp. Provide a bit of afternoon shade if the sun is too intense for your specific location.

Curling leaves on other plants

Find out what's wrong with your greater bird's-foot-trefoil

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.

When to worry

It is normal for leaves to curl slightly during the heat of the day as a natural defense. Worry if the leaves stay curled even at night or if they start to turn brown and crispy.

Stopping it coming back

Keep the soil consistently moist and inspect your plant weekly for early signs of aphids.