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Bur oak · Quercus macrocarpa

Why are my Bur Oak leaves curling?

It is less common for a healthy Bur Oak to have curling leaves, so this usually points to environmental stress or a specific fungal infection. Check your tree for signs of Bur Oak Blight, a fungal leaf disease that can distort the leaves, and also consider drought and other stresses.

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

Check these first

  1. Inspect the leaves for dark, wedge shaped spots.
  2. Check the soil moisture level at the base of the tree.
  3. Look for signs of recent weather extremes like heat waves.

Likely causes

  1. Bur Oak Blight

    Most likely

    How to tell: You will see dark, wedge shaped lesions on the leaves that eventually cause the leaf to curl and turn brown. This typically happens in late summer as the fungus spreads.

    What to do: Prune out dead branches during the dormant winter months to reduce the fungal load. Apply a fungicide containing propiconazole as a trunk injection in the spring if the infection is severe.

  2. Drought Stress

    Possible

    How to tell: The leaves look dry, brittle, and curl inward to conserve moisture during hot, rainless spells. This is most common in younger trees that have not yet established deep roots.

    What to do: Water the tree deeply at the drip line every 10 to 14 days during dry periods. Apply a 3 inch layer of wood mulch around the base to help the soil retain moisture.

Curling leaves on other plants

Find out what's wrong with your bur oak

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

Be concerned if the curling is accompanied by premature leaf drop in mid summer. It is normal for leaves to curl slightly as they dry out naturally in late autumn.

Stopping it coming back

Keep your tree healthy by providing consistent water during its first few years and keeping the area around the trunk clear of lawn mower damage.

Bur oak: curling leaves? Check yours with a photo

Every plant is a little different. Take a photo of your bur oak 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 Bur Oak die from leaf curling?
Not necessarily, but it depends on the cause. If it is just drought stress, the tree will recover with proper watering.
Should I spray the leaves with water?
No, spraying the leaves does not help and can actually encourage fungal growth. Always water the soil at the base of the tree instead.

Guides to these causes

More problems with Bur oak

Back to the Bur oak 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.