Silver Maple Losing Large Bark Slabs: When to Worry & What to Do

Your 100+ year old silver maple has shed 3-foot-long bark strips on the south side. The exposed wood is solid, foliage is full and green. Here's why this is likely normal—and what not to do.

Why Silver Maples Shed Bark

• Natural exfoliation: Many maples shed outer bark as they expand in girth.
• South-side exposure: Freeze-thaw cycles on sun-warmed bark accelerate shedding (frost cracking/sunscald).
• Age factor: Older trees have thicker, less flexible bark more prone to sloughing.

Assessing Structural Risk

Good signs: Solid wood underneath, full green canopy, no large dead limbs with decay at attachments.

Concerning signs: Soft/punky wood, fungal conks on trunk, large dead limbs with decay at union, leaning trunk with soil heaving.

What NOT to Do

• Do not seal or paint the wound. Wound dressings trap moisture, promote decay, and slow compartmentalization.
• Do not fill cavities with concrete or foam.

Positive Actions

• Fertilize: 10-10-10 at 1 lb per inch trunk diameter, broadcast under canopy, water in (or apply before rain).
• Mulch: 2–3 inches organic mulch to dripline, not touching trunk.
• Monitor: Annual inspection by certified arborist for decay progression.
• Avoid "Weed & Feed" lawn products—they contain herbicides that harm trees.

Large, old silver maples commonly lose bark plates. If the wood is sound and canopy healthy, the tree is structurally stable for many more years.