Old Maple with Hollow Limbs: Decay Fungi, Not Tree Death

Heartwood Decay ≠ Tree Decline

Holes in large limbs with birds/squirrels = heartwood decay fungi hollowing dead center wood. Living cambium under bark is intact.

Key Points

• Hollow trees are often stronger in wind (tubular structure).
• Decay fungi don’t attack living cells.
• Tree compartmentalizes decay with guard cells.
• Only risk: if cavity >70 % cross‑section, mechanical failure possible (rare).

Care

Fertilize: 1 lb 10‑10‑10 per inch trunk diameter, watered in. Enjoy the wildlife habitat.