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Root Flare Problems

If the trunk goes straight into the ground like a telephone pole, the part of the tree we need to see may be buried.

Start At The Base

What A Root Flare Is

The root flare is where the trunk widens into the tree's main structural roots. On a properly planted tree, you should be able to see that widening at or very near ground level.

If the trunk stays the same width all the way into the soil, stop and look closer. The flare may be buried by deep planting, added soil, landscape beds, or years of mulch piled against the trunk.

Why It Matters

Deep Planting Can Become A Slow-Moving But Catastrophic Problem For The Tree

A tree can look fine for years while trouble develops below grade. When the flare stays buried, roots can circle the trunk, bark can stay buried where it should be exposed, and the tree can slowly lose its ability to move water and nutrients the way it should.

Young tree in a raised circular bed on a front lawn, thin and browning canopy — **Real Arborwise example, Farmersville.** From the street this reads as an ordinary young tree in a tidy bed. The canopy is thin and going off color early, and that is usually the first thing anybody notices. It is rarely where the problem is.

Base of the same tree, trunk going straight into the soil with no visible widening — **The base of that same tree.** The trunk goes straight into the ground like a post. No widening, no flare, nothing to tell you where the trunk ends and the roots begin. That means the flare is under there somewhere, and the only question left is how deep.

Tree base after excavation, with roots exposed around the trunk in wet clay soil — **What is under there.** Once the soil comes off you can finally see what the roots have been doing. This one fought us. Blackland clay sets up so hard we had to soak it before we could get into it at all, and even wet it comes off slowly, because the roots you are looking for are the ones you would cut through finding them. We don't call roots girdling until we can actually see them.

No visible widening where the trunk meets the ground
Mulch or soil piled directly against the trunk
Roots circling or pressing against the trunk
Canopy thinning, weak growth, or decline with no obvious canopy cause

“Three of the most common causes of poor tree establishment or death are planting too deep, improper watering, and girdling roots.”

Texas A&M Forest Service, Tree Planting guidance

What You Can Check

Look Before You Dig

Look at the shape. A healthy base should widen before it meets the soil.
Pull loose mulch back from the bark. Do not leave a mulch volcano against the trunk.
Stop if you hit compacted soil or large roots. Do not start cutting roots or digging aggressively around a mature tree just to find the flare.

What Arborwise Checks

We Start At The Base For A Reason

When a tree is thinning or declining and the canopy does not explain it, the root flare is one of the first places we look.

How deep the flare is buried
Whether roots are circling, crossing, or pressing against the trunk
Decay, wounds, cavities, or abnormal bark at the base
Construction, trenching, grade changes, irrigation changes, or other root disturbance

Sometimes the fix is simple. Sometimes uncovering the base reveals a bigger problem. We want to know which one it is before anybody starts cutting roots or moving soil.

“Not sure this matches your tree? Send us one photo of the whole tree and one right where the trunk meets the ground, or run it through Tree Check.”Annie, the Arborwise™ owl

Try The Checker

Not Sure This Matches Your Tree?

Arborwise Tree Check walks you through what you can actually see and helps narrow down what deserves attention.

Start Arborwise Tree Check Call (972) 430-8330