Pocket BotanistCheck these first
- Check the soil moisture level at the base.
- Look for signs of wilting before the leaves drop.
- Examine the soil for standing water.
Likely causes
Drought stress
Most likelyHow to tell: The leaves turn brown at the edges and fall off during the heat of summer. The soil around the base will feel dry and cracked.
What to do: Water the tree deeply every 7 to 14 days, ensuring the water reaches 12 inches into the soil. Apply a 3 inch layer of mulch around the base to retain moisture.
Root rot
PossibleHow to tell: The leaves wilt and drop even when the soil is wet. The tree may look generally unthrifty and the roots may smell sour or look mushy.
What to do: Improve soil drainage by aerating the area or redirecting water runoff. Stop watering until the top 3 inches of soil are dry to the touch.
Find out what's wrong with your sugar maple
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
If the tree drops most of its leaves in mid-summer, it is a sign of significant stress. Some leaf drop is normal as the tree sheds older foliage.
Stopping it coming back
Maintain a consistent watering schedule and keep the root zone mulched to regulate soil temperature and moisture.
Sugar Maple: leaf drop? Check yours with a photo
Every plant is a little different. Take a photo of your sugar maple 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.
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Questions people ask
- Should I fertilize a tree that is dropping leaves?
- No, avoid fertilizing a stressed tree as it can force growth that the tree cannot support.
- Is it normal for my tree to drop leaves in August?
- It is not ideal, but it often happens during particularly hot or dry summers as a defense mechanism.
Guides to these causes
More problems with Sugar Maple
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.