Will the leaves uncurl once the stress is gone?

Usually, the curled leaves will stay that way, but the new growth should come in flat and healthy. You can remove the curled leaves if they look unsightly.

Is curling always a sign of a problem?

Not always, as plants often adjust their leaves to manage light and heat. If the plant looks otherwise healthy, it is likely just fine.

Why are my spiny amaranth leaves curling? Causes and fixes

Check these first

Look closely at the curled leaves for tiny bugs.
Check if the soil is dry and needs a drink.
Feel the leaves to see if they are crispy or soft.

Likely causes

Aphid Infestation
Possible
How to tell: Leaves will curl or twist as aphids suck the sap from the tender new growth. You will likely see the insects themselves or a sticky residue on the leaves.
What to do: Wash the plant with a gentle spray of water to remove the pests. Follow up with an application of neem oil or insecticidal soap every 7 days.
Heat Stress
Possible
How to tell: The leaves curl inward to protect themselves from losing too much moisture during very hot days. The plant may look droopy in the afternoon sun.
What to do: Provide a bit of afternoon shade if the temperatures are extreme. Ensure the plant is getting enough water to stay hydrated during the heat.

Curling leaves on other plants

Find out what's wrong with your spiny amaranth

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 curling is accompanied by yellowing or stunted growth. Minor curling during the hottest part of the day is often just the plant protecting itself.

Stopping it coming back

Keep the plant well hydrated and inspect the new growth weekly for early signs of aphids.

Spiny amaranth: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your spiny amaranth 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 the leaves uncurl once the stress is gone?: Usually, the curled leaves will stay that way, but the new growth should come in flat and healthy. You can remove the curled leaves if they look unsightly.
Is curling always a sign of a problem?: Not always, as plants often adjust their leaves to manage light and heat. If the plant looks otherwise healthy, it is likely just fine.

Guides to these causes

Aphids

Why are my spiny amaranth leaves curling?

Check these first

Not sure what's wrong with your spiny amaranth?