Can I just pick the aphids off?

You can, but they reproduce very quickly. Using a gentle spray of water or insecticidal soap is much more effective for a full cleanup.

Do curled leaves mean my tree is dying?

Usually not. It is often just a reaction to pests or temporary heat. With proper care, your tree will likely push out healthy new leaves.

Japanese Maple: curling leaves, causes and fixes

Check these first

Inspect the undersides of the curled leaves for tiny insects.
Look for sticky residue on the leaves or stems.
Check if the leaves uncurl when the air cools down at night.

Likely causes

Aphids
Most likely
How to tell: You will see small green or black insects on the undersides of leaves or on new stems. They leave behind a sticky substance called honeydew.
What to do: Spray the leaves with a strong stream of water to knock the aphids off. If they persist, apply insecticidal soap or neem oil according to the label instructions.
Heat Stress
Possible
How to tell: Leaves curl inward during the hottest part of the day to conserve water. They usually flatten out again once the temperature drops at night.
What to do: Provide extra water during heatwaves to keep the root zone cool. If the tree is in a pot, move it to a cooler, shaded location.

Curling leaves on other plants

Find out what's wrong with your japanese maple

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 extreme heat. Worry if you see heavy aphid infestations or if the curling is accompanied by yellowing or stunted growth.

Stopping it coming back

Keep your tree healthy with consistent watering and good airflow. Check the new growth weekly during the spring when aphids are most active.

Japanese Maple: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your japanese maple 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.

Get the app · Or check it from a photo now, free

Questions people ask

Can I just pick the aphids off?: You can, but they reproduce very quickly. Using a gentle spray of water or insecticidal soap is much more effective for a full cleanup.
Do curled leaves mean my tree is dying?: Usually not. It is often just a reaction to pests or temporary heat. With proper care, your tree will likely push out healthy new leaves.

Guides to these causes

Aphids

Why are my Japanese Maple leaves curling up?

Check these first

Not sure what's wrong with your japanese maple?