A split trunk won't heal on its own. A certified arborist can install steel cables above the split to buy a few more years. Without intervention, the tree will likely fail within a year. The halves will not graft together.

Hollow Birch Trunk: Decay Fungus, Tree Still Healthy
Deer Antler Damage on Red Maple: Emergency Response
Saving a Rotting Poplar: Fertilization for Structural Longevity
Mango Tree from Seed: Rootstock Suckers & Fruiting Reality
Neighbor's Holly Tree with Yellow Leaves: Assessing Health and Boundary Issues
Mushrooms on Tree Trunks: A Sign of Internal Decay
Co-Dominant Trunks in Maple: Why Early Correction Prevents Future Failure
Mushrooms on Oak Trunk: Sign of Irreversible Internal Decay Requiring Removal
Nailing a Flagpole to a Tree: Use Aluminum Gutter Spikes
Estimating Live Oak Age: Why Diameter Doesn't Tell the Whole Story
Flowering Cherry with Rotting Trunk: Remove Before It Falls on House
Large Oak Trunk Gall (Crown Gall) May Not Kill Tree for Years
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