Skip to content
Pocket Botanist
Get the app

Green Ash · Fraxinus pennsylvanica

Why are my Green Ash leaves turning yellow?

It is less common for a healthy Green Ash to show yellowing leaves, so this usually points to a nutrient deficiency or an issue with soil drainage. Check your soil moisture levels first to see if the roots are sitting in standing water.

Not sure it's this? Check a photo of your plant for free

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

Check these first

  1. Check the soil moisture at a depth of 3 inches.
  2. Look for green veins on the yellowing leaves.
  3. Inspect the base of the tree for standing water.

Likely causes

  1. Iron Chlorosis

    Most likely

    How to tell: The veins of the leaves stay green while the tissue between them turns yellow. This happens when the tree cannot absorb enough iron from the soil.

    What to do: Apply a chelated iron supplement to the soil around the base of the tree. Follow the package instructions carefully for the correct dosage based on the tree size.

  2. Poor Drainage

    Possible

    How to tell: The leaves turn yellow and may drop prematurely because the roots are drowning. You might notice the soil stays soggy for days after rain.

    What to do: Improve the soil drainage by aerating the area around the drip line. Avoid adding extra mulch near the trunk which can trap excess moisture.

Yellow leaves on other plants

Find out what's wrong with your green ash

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.

Download on the App StoreGet it on Google Play

When to worry

Worry if the yellowing spreads rapidly across the entire canopy during the summer. It is normal for some older inner leaves to yellow and drop in late autumn.

Stopping it coming back

Maintain a consistent watering schedule and ensure the tree is planted in well draining soil.

Green Ash: yellow leaves? Check yours with a photo

Every plant is a little different. Take a photo of your green ash 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.

Download on the App StoreGet it on Google Play

Get the app · Or check it from a photo now, free

Questions people ask

Can I just add fertilizer to fix yellow leaves?
Only if a soil test confirms a nutrient deficiency. Adding fertilizer to a stressed tree can sometimes make the problem worse.
Is yellowing a sign of Emerald Ash Borer?
Not usually. Emerald Ash Borer typically causes canopy thinning and dieback rather than just yellowing leaves.

Guides to these causes

More problems with Green Ash

Back to the Green Ash 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.