Will yellow leaves turn green again?

No, once a leaf has turned yellow, it will not return to green. Focus on keeping the new growth healthy.

Can too much sun cause yellow leaves?

Tree of heaven loves full sun, so it is rarely the cause of yellowing. Check for water issues instead.

Why are my Tree of heaven leaves turning yellow?

Check these first

Check the soil moisture level by sticking your finger 2 inches deep.
Inspect the base of the tree for signs of standing water.
Look at the leaf veins to see if they remain green.

Likely causes

Overwatering
Most likely
How to tell: The soil feels constantly wet or swampy, and the yellowing starts on lower leaves.
What to do: Stop watering immediately and let the top 3 inches of soil dry out. Ensure the area has proper drainage to prevent water from pooling around the roots.
Nutrient Deficiency
Possible
How to tell: Leaves turn yellow while veins remain green, often indicating a lack of iron or nitrogen.
What to do: Test your soil pH to ensure it is not too alkaline. Apply a balanced fertilizer once in early spring to support healthy growth.

When to worry

Worry if the yellowing spreads rapidly across the entire canopy. It is normal for a few older leaves to yellow and drop in late summer.

Stopping it coming back

Maintain a consistent watering schedule and avoid over fertilizing.

Not sure which one it is? Photograph your tree of heaven.

This page lists the usual causes. Pocket Botanist looks at your actual leaf 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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Questions people ask

Will yellow leaves turn green again?: No, once a leaf has turned yellow, it will not return to green. Focus on keeping the new growth healthy.
Can too much sun cause yellow leaves?: Tree of heaven loves full sun, so it is rarely the cause of yellowing. Check for water issues instead.