What do cracks or splits in a tree trunk mean for the next decision?

What are codominant stems, and when can their union be a structural concern?

Codominant stems are two substantial stems competing as the tree's main leaders. Their presence is a reason to examine the union, not an automatic removal verdict. Cracking, weak attachment and the consequences of a failure matter more than simply counting trunks.

What makes the union worth checking?

An arborist examines how the stems join, whether bark is trapped between them, and whether there is evidence of separation or decay. Included bark is one possible defect; it should not be assumed from a distant view of every narrow fork.

Match the response to the finding

A stable-looking union without known damage may be suitable for a planned assessment and management discussion. A recent crack, visibly opening fork or newly displaced stem requires a more urgent assessment and keeping people away from the potential fall area. Do not pull on the stems to test them.

Where a defect is confirmed, ask whether appropriate pruning, a professionally designed support system or removal best addresses it. Supplemental support is a management option for selected trees, not a homeowner repair or proof that all risk has disappeared.

Questions that improve the recommendation

Ask which stem or union is the concern, what evidence shows it is defective, and what could be struck if it failed. Request photographs marking the finding and a clear explanation of how the proposed work changes the risk.

For a retained tree, establish who will inspect it again and which changes require earlier attention. Avoid a quote that simply says “cable tree” without identifying the problem and follow-up responsibility.

What is included bark, and how can it affect a branch or trunk union?

Included bark is bark trapped between developing stems or branches at their union. It can interrupt the wood connection and contribute to a weaker attachment. The important question is how that particular union performs within the whole tree—not whether the bark forms an unattractive crease.

Do not treat the label as the assessment

Ask an arborist to point out the suspected included bark and distinguish it from an ordinary bark ridge or another surface feature. Note any known change, such as a crack that recently appeared or a stem that shifted. A ground-level photograph can document the location but cannot measure the union's strength.

Consider the tree and the target together

A questionable union over a frequently occupied patio calls for a different exposure-management discussion from the same observation over an unused area. Moving activities away may be a useful immediate precaution while the tree is assessed. It does not repair the union.

Understand the available decisions

Professional pruning or support may be considered in selected cases; a more severe defect may make removal the appropriate recommendation. Ask why the proposed option is suitable, what limitations remain, and what inspection is needed afterward.

Do not cut into the fork to remove the bark, bolt stems together, or wrap a rope around them. Those actions are not substitutes for assessment and a specified professional solution.

Practical next step: send an arborist a whole-tree photograph, a safely obtained view of the union, the tree's location relative to occupied areas, and the date any visible change occurred. Request a written finding rather than a diagnosis based only on the term “included bark.”