Question guide
Why Are My Tree's Leaves Turning Brown?
Updated · Limbwright editorial
Short answer
The pattern of browning tells you most of what you need to know. Brown edges on leaves all over the tree usually mean drought or heat. Browning that starts at the top, or on one side, or kills the crown in weeks, points to root problems or disease and needs a closer look.
Read the pattern
| What you see | Likely cause |
|---|---|
| Brown edges on leaves throughout the crown | Drought or heat scorch |
| Browning from the top down | Root damage, borers or decline |
| One side or one limb browning | Root loss on that side, or a vascular disease |
| Whole crown browns within weeks | Possible oak wilt, Dutch elm disease or severe root failure |
| Yellow leaves with green veins | Nutrient uptake problem, often high soil pH |
What to do this week
Water deeply if the soil is dry, out at the edge of the canopy, not just at the trunk. Then watch. If browning keeps spreading after watering, or the pattern matches a disease, have the tree inspected before more of the crown is lost.
- Water slowly
- A soaker hose at the drip line for a long, slow soak.
- Do not fertilize a stressed tree
- It can push growth the roots cannot support.
- Photograph it
- Pictures a week apart show whether it is spreading.
Signs that need an arborist soon
Oak leaves with brown veins or edges in early summer
Possible oak wilt in some regions.
Elm branch wilting suddenly
Possible Dutch elm disease.
Ash thinning from the top
Emerald ash borer.
Mushrooms at the base
Root decay.
Other common causes
- Recent construction
- Cut or compacted roots show up as browning a year or more later.
- Lawn herbicides
- Some weed killers injure trees whose roots run under the lawn.
- Salt
- Road salt and seawater from storm surge damage roots.
- Too much water
- Waterlogged roots cannot breathe, and leaves brown too.
Leaf browning questions
Will my tree recover from leaf scorch?
Usually. Trees often leaf out normally the next spring if they get water through dry spells.
Should I cut off the brown branches?
Wait until you know whether the branches are dead. Many leaves brown while the twigs stay alive.
Can a lab test my tree?
Most state extension services run plant diagnostic labs that accept samples.
Drought, the most common cause
Leaf scorch from drought or heat is by far the most frequent reason for summer browning. Water moves from roots to leaves, and the leaf edges and tips are the farthest point on that path, so they dry first. Trees in narrow street strips, beside hot pavement or with roots cut by past digging are hit hardest. Newly planted trees are especially vulnerable for their first two or three summers.
A deep weekly soak during dry spells usually does more than frequent light watering, because it reaches the roots that matter. A layer of mulch two to four inches deep over the root zone, kept a few inches off the trunk, holds moisture and keeps soil cooler. Lawn sprinklers alone rarely wet the soil deeply enough for a large tree during a heat wave.
Get a diagnosis before a treatment
Spraying or injecting without a diagnosis rarely helps. An arborist can tell drought from disease and say whether treatment, pruning or removal is the right move. See tree disease and pest treatment.
This guide is general information, not professional, legal or insurance advice. Tree conditions, local rules and policy terms vary. Have a qualified arborist inspect the tree, and confirm regulations and coverage with your city and insurer.
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