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Leaning Trees: What Usually Matters

A lean on its own is common and often fine. What usually matters more is whether the ground under the tree has moved, and whether the trunk curved into the lean or tipped over as one piece.

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Look at the Ground, Not the Tree

Stand on the side opposite the lean and look at the soil. That is the side the roots are pulling on. If the ground there is cracked, humped, or lifting, the roots may be moving, and that could be a problem.

If the ground is flat and undisturbed, the lean is usually old news. Trees grow toward light and away from crowding, and a lot of them have leaned since they were saplings.

!If the ground on the far side is cracked or lifting, please keep people and vehicles out from under the tree until someone's had a proper look at the base. And please don't dig around the base to check. If the plate is moving, that is the last place to be standing.

Why It Matters

Curved Versus Tipped

A trunk that curves usually means the tree grew into the lean over years and laid down reinforcing wood at the base as it went. That is generally the better sign.

A straight trunk that is tilted as one whole unit is a different question. That usually says more about the roots than the wood, and it is worth having somebody put eyes on the base and the root flare before the next big wind, even if the ground looks fine today.

Cracked, humped or lifting soil on the side opposite the lean
A lean that is new, or that has gotten worse recently
A straight trunk tilted as one piece rather than curved
Soil that has been saturated for a long stretch, or roots cut on the tension side by a trench or driveway

Read more from people who study thisISA's guide to recognizing tree risk (PDF)ISA on managing tree hazards and risk

What You Can Check

Three Things From a Safe Distance

Photograph it against something plumb. A fence post, a power pole, or the corner of the house gives you a straight line to compare the trunk against, and something to compare next year.
Look for a raised lip in the lawn on the side opposite the lean. From a few steps back, not up close.
Notice what is under it. A leaning tree over open lawn and one over the driveway are two different conversations.

What Arborwise Checks

The Base, the Flare, and the Far Side

We would walk the full circumference around the base, check whether the trunk is bowed or simply tilted, and look for anything that has cut roots on the tension side.

Whether the root flare is visible and what the soil is doing around it
Any decay, cavities or fungus at the base
Whether the lean has changed, if you have an old photo
What the tree is over, and how urgent it actually is

Most of the time the answer is that it is fine and worth keeping an eye on. When it isn't, you get a straight answer about how urgent it is and what the options are.

“Send a photo from far enough back to get the whole tree in, with something straight in the frame, and one of the ground on the side opposite the lean.”Annie, the Arborwise™ owl

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Not Sure This Matches Your Tree?

Arborwise Tree Check walks you through what you can actually see and helps narrow down what deserves attention. Estimates are free and we love talking trees.

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