Is a Hollow Tree a Dead Tree? Understanding Heartwood Decay and Structural Risk

The Living Layer

Only the cambium (thin layer under bark) is alive. Wood (xylem) is dead cells.

How Hollows Form

Fungi enter bark wounds → rot heartwood (dead wood) over decades → hollow trunk.

Structural Implications

• Hollow tree = not dead. Cambium intact.
• Tubular structure = high strength-to-weight; often more wind-resistant than solid trunk.
• But: some strength lost; can break in severe storms.

Bottom Line

A hollow tree is a natural, often healthy stage. It does not mean "ready to fall." Assess by a certified arborist if concerned about structural risk.