Pocket BotanistCheck these first
- Check the soil moisture level 6 inches deep.
- Look for signs of Bur Oak Blight on the leaves.
- Examine the surrounding soil for salt crusts.
Likely causes
Drought stress
Most likelyHow to tell: The leaf edges turn brown and crispy during hot, dry summer months. This often starts on the outer edges and moves inward.
What to do: Provide a deep soak once every 10 to 14 days during dry spells. Apply 10 to 15 gallons of water slowly around the drip line of the tree.
Salt accumulation
PossibleHow to tell: Brown tips appear even when the soil feels moist. This often happens if you use water softeners or have high salt levels in your local soil.
What to do: Flush the soil around the base of the tree with a large volume of fresh water to leach salts away. Avoid using fertilizers with high salt content near the root zone.
Find out what's wrong with your bur oak
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
Worry if the browning spreads rapidly to the entire leaf or if the tree drops leaves in midsummer. Minor browning at the very tips during a heatwave is often just a normal reaction to high temperatures.
Stopping it coming back
Maintain a 3 inch layer of organic mulch around the base to keep soil moisture consistent. Avoid piling mulch against the trunk.
Bur oak: brown tips? Check yours with a photo
Every plant is a little different. Take a photo of your bur oak 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 trim off the brown tips?
- You can trim them for aesthetics, but it is not necessary for the health of the tree. Use clean, sharp shears and cut just outside the green tissue.
- Can fertilizer help?
- Avoid fertilizing a stressed tree. Fertilizer can actually increase salt stress and make the browning worse.
Guides to these causes
More problems with Bur oak
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.