Common Tree Problems on Boise Properties

Quick answer: In Boise, the most common tree problems are limbs failing in windstorms, stress from hot, dry summers, large fast-growing trees that have outgrown their lots, and hidden decay in older trees. Most can be managed with the right pruning, watering and regular checks. The key is catching them early.

1. Wind damage

Boise's windstorms regularly bring down limbs and whole trees. Trees most at risk have weak V-shaped forks, long heavy limbs, dead wood, or decay. Prevention: have large trees near the house checked, remove deadwood, and reduce weight on long limbs. After a windstorm: what to do →

2. Drought and heat stress

Boise's semi-arid summers mean many landscape trees depend on irrigation. Lawn sprinklers often water too shallowly for trees. Stressed trees show scorched or small leaves and early leaf drop, and they are more vulnerable to pests. Prevention: deep, slow watering over the root zone, plus mulch (kept away from the trunk).

3. Big trees on small lots

Fast-growing species planted decades ago, such as silver maples, Siberian elms and cottonwoods, can outgrow city lots. They drop limbs, crowd roofs and lift sidewalks. The answer may be structural pruning or, sometimes, removal and replanting with a better-suited species. The City of Boise publishes a tree selection guide.

4. Decay in mature trees

Older trees can rot internally with few outward signs. Watch for mushrooms or conks at the base, cavities, cracks and dieback in the crown. Is my tree dying? →

5. Pests to watch for

Emerald ash borer kills untreated ash trees. As of April 2026 it had not been detected in Idaho, but officials are asking the public to watch for it. Emerald ash borer in Boise →

6. Poor past pruning

Topped trees regrow with weak, crowded shoots that break easily. Corrective pruning over several years can improve them. The City advises never removing more than a quarter of the crown in one season.

When to call a professional

Call if you see a new lean, a crack, large dead limbs over a target, or decay at the base. Tree health care → · Tree removal →

Sources: City of Boise: Tree Care · City of Boise: Tree Selection Guide · Capital Press, 2026-04-14: emerald ash borer