7 Signs a Tree on Your Property Is Dangerous

A large tree that fails can damage your home, vehicles, or worse. Most hazardous trees give warning signs well before they fall — if you know what to look for. Here are seven signs a tree on your Southern California property may be dangerous.

The warning signs

• 1. Leaning suddenly: a new or worsening lean, especially with soil heaving on one side, signals root failure.
• 2. Dead or hanging branches: large deadwood and broken limbs can drop without warning.
• 3. Cracks in the trunk: deep splits or seams suggest serious structural weakness.
• 4. Cavities and decay: hollows, soft or crumbling wood, and mushrooms at the base point to internal rot.
• 5. Root problems: heaving soil, cut roots, or fungus around the base undermine stability.
• 6. Sparse or dying canopy: bare branches or large dead sections indicate a declining tree.
• 7. Co-dominant or weak unions: two trunks with a tight, V-shaped, included-bark junction are prone to splitting.

Why Santa Ana winds raise the stakes

Our seasonal Santa Ana winds put enormous stress on trees. A tree with any of the above weaknesses is far more likely to fail during a wind event, making proactive inspection important before windy season.

What to do

If you spot these signs, have a certified arborist assess the tree. Sometimes pruning or cabling can save it; in other cases removal is the safe choice. Don't wait for a storm to decide for you. Our tree team can evaluate risk.

Frequently asked questions

Can a leaning tree be saved?

A long-standing, stable lean may be fine, but a sudden new lean usually means root failure and often requires removal. Have it assessed.

Are mushrooms on a tree a bad sign?

Often yes — fungi at the base or on the trunk can indicate internal decay that weakens the tree.

Arbol Roble has cared for Inland Empire landscapes since 1997, serving Rancho Cucamonga, Ontario, Fontana, Eastvale, Corona and Riverside. Request a free quote or browse our residential and commercial services.