Pocket BotanistCheck these first
- Examine the branches for any orange or sunken bark patches.
- Check if the soil is waterlogged or smells sour.
- Look for signs of recent extreme heat or drought.
Likely causes
Chestnut blight
Most likelyHow to tell: You will see orange or reddish cankers on the branches, and leaves above the affected area will wilt and drop.
What to do: Prune out the infected branches well below the canker, sterilizing your tools with alcohol between every cut. Dispose of the infected wood in the trash, not your compost pile.
Waterlogging
PossibleHow to tell: The leaves turn yellow before falling off, and the soil stays soggy for days after watering.
What to do: Stop watering immediately and allow the soil to dry out. If the area stays wet, consider installing a drainage pipe or mounding the soil to raise the root zone.
Find out what's wrong with your sweet chestnut
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.
Scan with your phone's camera to get the app
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When to worry
Worry if you see branches dying back or if the leaf drop happens in early summer. It is normal for the tree to drop leaves in late autumn as it prepares for winter.
Stopping it coming back
Keep the tree healthy by pruning away dead wood and ensuring it has plenty of space for airflow.
Sweet chestnut: leaf drop? Check yours with a photo
Every plant is a little different. Take a photo of your sweet chestnut 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.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Will my tree die if it loses some leaves?
- Not necessarily, but it is a warning sign. Monitor the tree closely for further symptoms.
- Is it normal for leaves to drop in July?
- No, that is not normal for a healthy sweet chestnut. It suggests the tree is struggling with disease or water issues.
More problems with Sweet chestnut
Back to the Sweet chestnut 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.