Pocket BotanistCheck these first
- Feel the soil moisture 4 inches down near the drip line.
- Check if the browning is happening after a long dry spell.
- Look for signs of leaf miner damage that might mimic browning.
Likely causes
Drought Stress
Most likelyHow to tell: The tips of the leaves turn crisp and brown, often starting on the outer edges of the canopy.
What to do: Water the tree deeply every 7 to 14 days during the growing season. Ensure the water reaches 12 inches deep into the soil to encourage deep roots.
Heat Scorch
PossibleHow to tell: Leaves look scorched and brittle during periods of extreme heat and wind.
What to do: Apply a 3 inch layer of organic mulch around the base of the tree to keep the roots cool. Keep the mulch a few inches away from the trunk itself.
Find out what's wrong with your black locust
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 some leaves to brown slightly in late summer. Worry if the entire canopy is browning or if the tree is dropping leaves prematurely.
Stopping it coming back
Mulch the root zone annually and provide deep soakings during the first two years of growth.
Black Locust: brown tips? Check yours with a photo
Every plant is a little different. Take a photo of your black locust 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
- How much water does a mature tree need?
- Once established, Black Locust is quite drought tolerant. You only need to water during extended periods without rain.
- Is my tree dying if the tips are brown?
- Usually, no. It is just a sign that the tree is trying to conserve moisture.
Guides to these causes
More problems with Black Locust
Back to the Black Locust 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.