Will my leaves uncurl once I fix the problem?

Usually, the existing leaves will remain somewhat distorted, but new growth should come in flat and healthy. Focus on the health of the new leaves.

Should I cut off the curled leaves?

You can trim them if they look unsightly, but it is not strictly necessary unless they are heavily infested with pests. The plant needs its leaves to grow, so do not remove too many at once.

Why are my lamb's quarters leaves curling? Causes and fixes

Check these first

Inspect the undersides of the curled leaves for tiny insects.
Touch the soil to see if it feels dry or parched.
Observe if the leaves flatten out after the sun sets.

Likely causes

Aphid infestation
Most likely
How to tell: You will see small green or black insects clustered on the undersides of leaves or near the growing tips. The leaves may look distorted or sticky from the honeydew the aphids leave behind.
What to do: Spray the plant with a strong stream of water to knock the aphids off. If they persist, apply insecticidal soap once a week until the insects are gone.
Heat stress
Possible
How to tell: The leaves curl inward during the hottest part of the day to conserve moisture. If the plant perks back up once the sun goes down, it is just reacting to the heat.
What to do: Provide a bit of afternoon shade if the temperatures are consistently above 90 degrees. Make sure you are watering every 3 to 7 days so the soil stays consistently moist.

Curling leaves on other plants

Find out what's wrong with your lambs quarters

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

Worry if the leaves stay curled even at night or if you see significant yellowing alongside the curling. It is normal for leaves to curl slightly during the peak heat of a summer afternoon.

Stopping it coming back

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

Lambs quarters: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your lambs quarters and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.

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Questions people ask

Will my leaves uncurl once I fix the problem?: Usually, the existing leaves will remain somewhat distorted, but new growth should come in flat and healthy. Focus on the health of the new leaves.
Should I cut off the curled leaves?: You can trim them if they look unsightly, but it is not strictly necessary unless they are heavily infested with pests. The plant needs its leaves to grow, so do not remove too many at once.

Guides to these causes

Aphids

Why are my lamb's quarters leaves curling?

Check these first

Not sure what's wrong with your lambs quarters?