Should pruning cuts be sealed or painted?

How a tree handles a wound

Trees do not heal the way skin does. They wall off the damaged wood and grow new tissue around it. Arborists describe this with the CODIT idea developed by Alex Shigo, short for compartmentalization of decay in trees. The closure is fastest when a cut is made at the right place and before the spring growth flush, a point the ISA makes about timing.

A coat of paint or tar sits on the surface. It does not stop the wall-off process, and it can trap moisture against the cut.

Where the cut goes

A branch grows out of a trunk with a slightly swollen ring at its base, called the branch collar. Cutting just outside the collar leaves the tree's own sealing tissue intact. A flush cut removes it, and a stub left long invites decay. Good pruning is mostly a matter of choosing the right limb and the right spot, not covering the result.

We do not give instructions for cutting large limbs yourself. Heavy limbs fall unpredictably and belong to a crew.

The exceptions and the honest limits

A few situations get a different answer. In some regions, trees prone to a particular disease are pruned only in set seasons, and the ISA notes that susceptible trees should not be pruned during active disease transmission periods. Whether any of that applies to your tree is the arborist's call, not something to settle from a general page.

We do not offer treatments, sprays or injections, so wound dressing is not something we sell either way.

What to ask at the estimate

Ask which cuts will be made and where, and whether any limb is large enough to need special care. A certified arborist assesses the job before the crew starts. The estimate is free at 775.232.8243.