Historic Apple Tree Cavity: Leave Open, Boost Health

Modern Science: No Fill, No Drain

Cement, foam, and drainage tubes damage compartmentalization walls and trap moisture. Decay fungi thrive in dark, damp fills.

Remove all fill material.
Do not drill drain holes.
Fertilize, water, mulch to maximize tree's natural defense (compartmentalization).
Monitor for structural risk; consult arborist if cavity >⅓ trunk circumference.

Trees: Apple Tree Bark Separating from Trunk: Tree Dead or Dying—Check for Borers, Fire Blight, Contact Extension; Apple Tree Decline: Fewer Blossoms, Wilted Leaves; Diagnosing Apple Tree Fruit and Leaf Problems; Crab Apple White Fluffy Growth: Scale or Powdery Mildew?; Growing Apple Trees from Seed in a Tropical Climate; Oak Tree Cavity Rot: Don't Fill, Fertilize Instead; Tree Cavity in Deck Tree: Don't Fill, Fertilize; Seed-Grown Apple Tree: 10-Year Wait for Fruit; Reviving a Wild Apple Tree: Pruning and Care Guide; Apple Seedlings: Will Grow Into Trees, But Fruit Quality Is a Lottery

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