Hollow Oak Tree: Decay Fungus ≠ Death Sentence

The Hollow

Caused by wood-decay fungus entering past wound. Decay fungi do not kill living tissue. They only digest dead heartwood.

Structural Risk Assessment

• 1/3 trunk width hollow after 15+ years, withstood storms = currently stable.
• First warning sign: large hollow limbs breaking in crown.
• Green, full canopy = tree is vigorous, compartmentalizing decay.

Action Plan

1. Do not remove based on hollow alone.
2. Hire ISA Certified Arborist (find one) for formal risk assessment (ANSI A300).
3. If arborist says low risk, present report to HOA.
4. Fertilize 10-10-10 (1 lb/inch DBH) to maintain vigor.

Key Point

Hollow ≠ dead. Many hollow oaks stand centuries. HOA managers often lack arboricultural knowledge.