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Japanese spindle · Euonymus japonicus

Why are my Euonymus japonicus leaves curling?

It is less common for this plant to have curling leaves, but it often points to a pest infestation or a reaction to environmental stress. Inspect the undersides of the leaves for tiny bumps or webbing.

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curling leaves on a plant
Photo: Freshclover, CC BY-SA 4.0

Check these first

  1. Look closely at the undersides of leaves for small bumps.
  2. Check for a white powdery substance on the leaf surfaces.
  3. Ensure the plant has enough space for air to move around it.

Likely causes

  1. Euonymus scale

    Most likely

    How to tell: Small white or brown bumps appear on the stems and leaves, causing them to curl or distort.

    What to do: Scrape off visible scales with a soft brush or cloth. Treat the plant with horticultural oil or neem oil every 7 to 10 days until the infestation is gone.

  2. Powdery mildew

    Possible

    How to tell: A white, dusty coating appears on the leaves, which may cause them to curl or twist.

    What to do: Increase air circulation around the plant by moving it to a less crowded spot. Apply a fungicide or a mixture of water and baking soda to the affected leaves.

Curling leaves on other plants

Find out what's wrong with your japanese spindle

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

If the curling is accompanied by heavy leaf drop or visible insects, take action immediately. Minor curling on a single leaf is usually not a cause for alarm.

Stopping it coming back

Keep the plant healthy with proper light and airflow to discourage pests and fungal growth.

Japanese spindle: curling leaves? Check yours with a photo

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

Are these bumps harmful?
Yes, the bumps are likely scale insects that suck sap from your plant. They can weaken the plant significantly if left untreated.
Does powdery mildew kill the plant?
It rarely kills the plant outright, but it weakens it and makes it look unsightly. Treat it early to prevent it from spreading to other leaves.

Guides to these causes

More problems with Japanese spindle

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This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.