Is yellowing always a disease?

Not always, but on a Japanese zelkova, it is a sign that something is stressing the root system or the vascular health of the tree. Always check the bark for cankers first.

How do I know if it is a canker?

Look for areas where the bark looks sunken, cracked, or discolored. These spots often feel soft or brittle compared to the healthy bark.

Japanese zelkova: yellow leaves, causes and fixes

Check these first

Examine the branches for sunken or dead bark patches.
Check the soil around the base for standing water.
Feel the soil to see if it is waterlogged.

Likely causes

Canker disease
Possible
How to tell: You will see sunken, discolored areas on the bark that can girdle branches. This causes the leaves above the infection to turn yellow and eventually die.
What to do: Prune out the infected branches well below the visible canker. Sterilize your pruning shears with alcohol between every cut to avoid spreading the fungus.
Overwatering
Possible
How to tell: The leaves turn yellow and the soil stays soggy for a long time. This is less common for this tree unless the soil has poor drainage.
What to do: Stop watering immediately and let the top 3 inches of soil dry out. Ensure the planting site has good drainage and avoid piling mulch against the trunk.

Yellow leaves on 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.

When to worry

Worry if you see sunken bark or if the yellowing spreads rapidly across the canopy. Some yellowing in late autumn is normal as the tree prepares for winter.

Stopping it coming back

Avoid wounding the trunk with lawn equipment and ensure the tree is planted in well draining soil.

Japanese zelkova: yellow leaves? 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.

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

Questions people ask

Is yellowing always a disease?: Not always, but on a Japanese zelkova, it is a sign that something is stressing the root system or the vascular health of the tree. Always check the bark for cankers first.
How do I know if it is a canker?: Look for areas where the bark looks sunken, cracked, or discolored. These spots often feel soft or brittle compared to the healthy bark.

Guides to these causes

Canker

Why are my Japanese zelkova leaves turning yellow?

Check these first

Not sure what's wrong with your japanese zelkova?