Lac Balsam Tree Wound Treatment

Lac Balsam is a water-based tree wound dressing that you brush onto damaged bark, where it dries to a flexible film. Arborists and orchard growers use it on bark tears, mower damage and graft unions rather than on routine pruning cuts.

Where Lac Balsam fits

Most current guidance, including ANSI A300, says wound dressings are not needed on ordinary pruning cuts. A good cut at the branch collar closes on its own. Lac Balsam earns its place on the jobs where you want to protect exposed cambium: a strip of bark torn off by a mower or a lowering mishap, a fresh graft, or a wound on a young tree you are trying to keep moist.

It is a niche product. If a client asks for wound paint on every cut, explain the standard and save the dressing for the cases above.

Some growers also like it on grafts, where it helps keep the union from drying out while the scion takes. On young street trees damaged during planting or by string trimmers, a coat can protect the wound while you sort out the cause, usually by mulching a ring so the trimmer stays away.

Applying it

Trim loose, ragged bark back to clean, attached tissue first. Brush a thin layer over the exposed wood and the wound edges, then let it dry. Check the product label for temperature limits and reapplication. Wash brushes in water before it sets.

A tub goes a long way since you only coat damaged areas. Keep the lid sealed between uses so it does not skin over, and store it where it will not freeze. If a wound keeps getting reopened, fix the cause; no dressing replaces good care.