Pocket BotanistCheck these first
- Check the soil moisture level with a probe or your finger.
- Inspect the undersides of the leaves for small insects.
- Look for sunken lesions on the trunk that might indicate disease.
Likely causes
Drought Stress
Most likelyHow to tell: The leaves turn yellow or brown before falling off during hot summer months. The soil feels dry several inches down.
What to do: Water the tree deeply once every 7 to 14 days. Ensure the water reaches 12 to 18 inches deep to encourage deep roots.
Aphids
Most likelyHow to tell: You see sticky honeydew on the leaves or small insects clustered on the undersides. Leaves may curl or drop prematurely.
What to do: Spray the foliage with a strong stream of water to knock the aphids off. If the infestation is heavy, use an insecticidal soap according to the label instructions.
Find out what's wrong with your quaking aspen
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.
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When to worry
It is normal for aspens to drop some leaves in late autumn as they prepare for winter. Worry if the tree loses most of its leaves in midsummer.
Stopping it coming back
Maintain a consistent watering schedule and apply a layer of mulch around the base to keep the roots cool.
Keep your quaking aspen healthy from here
Save your plant in Pocket Botanist and you get care reminders timed for this plant, plus a care history that shows what worked. Identification and a health check are free.
Questions people ask
- Will my tree die if it loses leaves in summer?
- Not necessarily, but it is a sign of significant stress. Correct the watering immediately to help it recover.
- Should I fertilize a tree that is losing leaves?
- No, avoid fertilizing a stressed tree. Wait until it shows signs of recovery and healthy growth.
More problems with Quaking Aspen
- Why are my Quaking Aspen leaves turning yellow?
- What are these bugs on my Quaking Aspen?
- Why are there spots on my Quaking Aspen leaves?
- Why are my Quaking Aspen leaves getting brown tips?
- Why is my Quaking Aspen drooping?
- Why is my Quaking Aspen suffering from root rot?
- Why are my Quaking Aspen leaves curling?
Back to the Quaking Aspen guide
This article was generated with AI from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.