How Trees Heal: The Science of Compartmentalization

Trees don't heal like animals—they seal. When damaged, they compartmentalize: walling off decay to protect the rest. It's a survival strategy honed over millions of years.

The Process

Bark breach → fungi/insects enter → tree forms callus tissue (new bark) around wound → if successful, decay is contained. But it takes years. Age, species, damage extent, and weather all affect outcome.

Common Damage Sources

• Storms (wind, lightning)
• Pruning wounds
• Vehicle impact
• Animal activity (birds, squirrels)
• Construction root damage

When to Call a Pro

Minor wounds often self-seal. Major damage—large cracks, decay, canopy dieback—needs a certified arborist. They assess structural integrity, recommend cabling/bracing, or removal if hazardous.

Key Insight

A tree with a sealed wound isn't "healed"—it's fortified. The damage remains inside, contained. Respect the process. Don't paint wounds (traps moisture). Don't flush-cut (removes branch collar). Let the tree do its work.