My tree is leaning: is it going to fall?

The right question is not “is it leaning?” but “has it moved?”. Four signs can be read from the ground: soil heaved up in an arc at the base, a vertical crack in the trunk, a split in a fork, bark wrinkled on the compressed side. In South Finistère, a pine bent by the westerly wind for fifty years remains stable.

Why not fell a leaning tree with a chainsaw?

The trunk splits vertically and the butt kicks backwards, exactly where the operator stands. This splitting, known as a barber chair, is among the deadliest accidents in the trade: the fibres under tension give way before the felling cut is finished. Arb'Ouest never uses the standard notch on a leaning tree.

How does a professional handle a leaning tree?

At Arb'Ouest, the method is to remove the strain before cutting: pulling with a cable or winch to hold the direction, specific cuts against splitting, and most often dismantling from the top, section by section, until the remaining trunk is no longer out of balance.

How much does it cost to fell a leaning tree?

A leaning tree does not add an extra line to the quote: it falls into the heights where dismantling becomes necessary. The price is decided at the foot of the tree, never from a photo: what counts is below, not in the crown.

Felling a leaning tree: the technique

The short answer

A leaning tree has its centre of gravity shifted: the fibres on the side of the lean are under compression, those on the opposite side under extreme tension. A standard felling cut releases that tension all at once and the trunk splits vertically, throwing the butt backwards. This is known as a barber chair, and it is one of the deadliest accidents in the trade.

The trunk splitting, in plain terms

A barber chair is a failure by bursting, not a cut that slips. Picture a plank bent until it breaks: it does not snap cleanly, it bursts into splinters. A leaning trunk does the same, on a scale where the piece of wood weighs several hundred kilos.

The split runs up the trunk, sometimes for several metres, and the butt kicks violently backwards, that is, towards the exact spot where the operator stands. The movement is faster than any reflex. There is no getting out of the way.

Why the standard notch is not enough

Ordinary felling relies on three elements: a directional notch on the side of the fall, a felling cut on the opposite side, and a hinge of wood kept between the two to guide the movement.

That pattern assumes the tree is roughly balanced. On a strongly leaning tree, the tension is such that the wood gives way before the felling cut is finished. The hinge has no time to do its job, the tree goes on its own, and the trunk splits.

Nor is the imbalance always visible. An asymmetric crown, a strong prevailing wind as on the Fouesnant coast, or a partly lifted root system put the same strain on a tree that looks straight.

A leaning tree, or a tree that has moved?

A tree that has always leaned and a tree that started leaning this winter are not the same problem. The first has built its wood accordingly. The second is losing its anchorage. The right question is therefore not “is it leaning?” but “has it moved?”.

Four signs can be read from the ground. Soil heaved up in an arc at the base, on the side opposite the lean, betrays a root plate that is lifting. A vertical crack in the trunk, a split in the crotch of a fork, or bark wrinkled like an accordion on the compressed side tell the same story. A tree that has always leaned shows none of this: its trunk is simply thicker on the side that carries the load.

Along the coast around Fouesnant, the prevailing westerly wind produces pines bent towards the east that are perfectly stable, because they have grown that way for fifty years. The tree to worry about is the one that starts leaning after a storm, when it stood straight the autumn before.

What a professional does instead

At Arb'Ouest, the method is to remove the strain before cutting, rather than cutting and hoping the hinge holds.

That involves a combination of means: pulling the tree with a cable or winch to control the direction and relieve the tension, specific cuts that neutralise the risk of splitting, and most often dismantling from the top. In that case, the tree is reduced section by section from the top down, until the remaining trunk is no longer out of balance.

Dismantling costs more than direct felling. What the quote charges for is the time spent making the cut safe, far more than the time spent cutting.

Situations never to attempt yourself

Four configurations call for a professional, without exception.

A tree resting on another after a storm. The stored energy is considerable and its release is unpredictable.
An uprooting tree, whose root plate has lifted. It can slam back down with a force that crushes everything within reach.
A tree close to a power line (in French). An electric arc does not need contact.
A tree leaning towards a building. No technique allows an amateur to counter a natural lean.

After a storm, the temptation to act quickly is strong. Yet it is the worst moment: trees are under strain, the ground is unstable, and tiredness leads to mistakes.

What a leaning tree costs

A leaning tree does not add an extra line to the quote: it simply falls into the heights where sectional dismantling becomes necessary, and it is the dismantling that costs, not the lean. Removal and travel included.

The quote is drawn up on site, within 30 km of Fouesnant. A photo is enough for a first opinion, never for a price: on a leaning tree, what decides the price is at the foot of the tree and below it, not in the crown.

See what sets the price of tree felling, or send a photo on WhatsApp for a first opinion.

Felling a leaning tree: why it is the most dangerous job

Contents