Will the leaves grow back this season?

If the tree drops leaves due to stress, it likely will not replace them until the following spring. Focus on keeping the tree hydrated for next year.

Is the canker contagious?

Yes, fungal spores can spread to other branches or nearby trees. Always sanitize your pruning tools with alcohol between cuts.

American hornbeam: leaf drop, causes and fixes

Check these first

Examine the bark for sunken or oozing patches.
Check the soil moisture to see if the tree is severely dehydrated.
Look for signs of branch dieback starting from the tips.

Likely causes

Fungal canker
Most likely
How to tell: You will see sunken, dead areas on the bark or branches that look shriveled. Leaves above these spots often turn yellow or brown and fall off early.
What to do: Prune away the infected branches using sterilized shears, cutting several inches below the visible canker. Dispose of the clippings in the trash, not your compost pile.
Severe drought
Possible
How to tell: The tree drops leaves to conserve moisture during extended dry periods. The leaves may turn crispy and brown before falling.
What to do: Increase your watering frequency to every 7 days during extreme heat. Ensure the water penetrates at least 6 to 8 inches into the soil.

Leaf drop in other plants

Find out what's wrong with your american hornbeam

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

If the leaf drop is accompanied by dead branches or oozing sap, it is a serious health concern. It is normal for the tree to drop leaves in late autumn as part of its natural cycle.

Stopping it coming back

Keep the tree healthy with proper watering and avoid wounding the bark with lawn mowers or trimmers.

American hornbeam: leaf drop? Check yours with a photo

Every plant is a little different. Take a photo of your american hornbeam 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

Will the leaves grow back this season?: If the tree drops leaves due to stress, it likely will not replace them until the following spring. Focus on keeping the tree hydrated for next year.
Is the canker contagious?: Yes, fungal spores can spread to other branches or nearby trees. Always sanitize your pruning tools with alcohol between cuts.

Guides to these causes

Dehydration

Why is my American hornbeam losing its leaves?

Check these first

Not sure what's wrong with your american hornbeam?