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Sweetgum · Liquidambar styraciflua

Why are my American sweetgum leaves turning yellow?

Yellowing leaves on a sweetgum often signal that the tree cannot access the nutrients it needs from the soil. Check your soil pH first, as this is the most common culprit for nutrient lockout.

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yellow leaves on a plant
Photo: Trio3D, CC BY-SA 4.0

Check these first

  1. Test the soil pH level.
  2. Check the soil moisture around the roots.
  3. Look for green veins on the yellow leaves.

Likely causes

  1. Iron Chlorosis

    Most likely

    How to tell: The leaves turn yellow while the veins remain green. This usually happens when the soil pH is too high.

    What to do: Test your soil pH and aim for a range of 5.5 to 6.5. Apply chelated iron to the soil or as a foliar spray to help the tree recover quickly.

  2. Poor Drainage

    Possible

    How to tell: Leaves turn yellow and may look limp. The ground around the base feels constantly soggy.

    What to do: Improve soil drainage by adding organic matter like compost. Avoid overwatering and ensure the tree is not sitting in a low spot where water pools.

Yellow leaves on other plants

Find out what's wrong with your sweetgum

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

Worry if the yellowing spreads across the entire canopy during midsummer. Minor yellowing on older interior leaves during late autumn is normal.

Stopping it coming back

Maintain slightly acidic soil and ensure the planting site has adequate drainage.

Sweetgum: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your sweetgum 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 from chlorosis?
It rarely kills the tree outright, but it weakens it significantly over time. Treating the pH imbalance is essential for long term health.
Can I just add fertilizer?
Standard fertilizer might not help if the pH is wrong. You must fix the pH first so the tree can actually absorb the nutrients.

Guides to these causes

More problems with Sweetgum

Back to the Sweetgum 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.