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Japanese zelkova · Zelkova serrata

Why is my Japanese zelkova losing its leaves?

It is less common for a healthy Japanese zelkova to drop leaves during the growing season. This usually happens because of extreme heat stress or a sudden change in its environment. Check the soil moisture first to see if the tree is drying out too quickly.

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Check these first

  1. Feel the soil moisture 2 inches below the surface.
  2. Inspect the undersides of the leaves for small insects.
  3. Check if the tree has been exposed to recent extreme heat.

Likely causes

  1. Heat stress

    Most likely

    How to tell: Leaves may curl or turn brown at the edges before falling off during a heatwave. The soil will feel bone dry to the touch.

    What to do: Increase your watering frequency during hot spells to keep the root zone moist. Apply a 2 to 3 inch layer of organic mulch around the base to keep the roots cool.

  2. Aphid infestation

    Possible

    How to tell: You might see sticky honeydew on the leaves or small green insects on the undersides. Heavy feeding can cause premature leaf yellowing and drop.

    What to do: Spray the foliage with a strong stream of water to dislodge the aphids. If the problem persists, apply insecticidal soap according to the label instructions.

Leaf drop in other plants

Find out what's wrong with your japanese zelkova

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

It is normal for a Japanese zelkova to drop leaves in late autumn as it prepares for dormancy. Be concerned if the tree loses a significant amount of foliage while the weather is mild.

Stopping it coming back

Maintain consistent moisture during the first few years of establishment and keep the tree healthy to resist pests.

Japanese zelkova: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your japanese zelkova 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 tree die if it loses all its leaves in summer?
It is a serious sign of stress, but the tree may recover if you address the water needs immediately. Provide deep, slow watering to help it stabilize.
Can I fertilize a tree that is dropping leaves?
No, avoid fertilizing a stressed tree. Wait until it shows signs of recovery and new growth before adding any nutrients.

Guides to these causes

More problems with Japanese zelkova

Back to the Japanese zelkova guide

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.