Red Maple Bark Splitting: Sunscald/Frost Cracks

Vertical Cracks on Young Maple = Winter Injury

South/southwest trunk faces warm in winter sun, lose dormancy, then freeze at night—killing cambium. Thin-barked maples are prone.

Wrap trunk with light-colored tree wrap for first 2–3 winters (remove in spring).
Shade south side with shrubs/fence.
Water, fertilize, mulch to maintain vigor.

Watch for borer dust/holes in cracks—spray Merit if seen. Cracks may close over years.

Trees: How to Treat Sunscald on Young Red Maple Trees; Red Maple Bark Decay and Borers: Emergency Intervention; Maples with Severe Bark Loss: Likely Fatal; Maple Borers: Low Spread Risk, Monitor and Protect; Coral Bark Maple Losing Bark: Sunscald, Borers, or Natural Exfoliation?; Red Maple Bark Decay and Yellow Leaves: Borer Treatment and Fertilization; Maple Bark Splitting: Sunscald Diagnosis and Borer Prevention; Frost Cracks and Sunscald on Young Maple Trees; Maple Bark Peeling: Decay Fungi and Borer Prevention; Choosing the Right Maple Tree for Your Yard: Root Systems and Fall Color

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