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Hollow Birch Trunk: Decay Fungus, Tree Still Healthy

Rotted Base But Green Canopy = Compartmentalization Working

Decay fungi hollow heartwood only. Living sapwood under bark functions normally. Tree can stand for decades.

Care

Fertilize fall: 1 lb 10-10-10 per inch diameter.
Don't fill cavity—cement harms, foam is cosmetic.
Monitor for large limb failure.

Mouse in cavity is incidental.

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