Tree bark has a tendency to split and shed naturally. However, in some cases a crack could be a sign of a more serious problem that needs immediate addressing. Learn the signs and causes of a cracked tree trunk and what you should do about it.

Causes of a Cracked Tree Trunk

There are many reasons why bark cracks. Sometimes it’s a natural shedding process. Wildlife can also scratch, peck, and rub against the trunk. But there are other signs of damage and decay that could lead to a larger problem.

• Weather. When the day is warm and sunny days but the night is freezing cold, this can lead to sunscald and frost damage. Strong winds and lightening can also split the trunk.
• Gardening. Pruning incorrectly can impact tree health and make it more prone to cracking. Trimmers, weed whackers, and lawnmowers can also do damage if these tools gets too close.
• Fungus. Mold and other disease can infect the wood, causing decay inside and out.
• Pests. Insects are typically attracted to weak spots in plants. If the tree is already compromised, wood-feasting pests are likely to move in and further weaken the tree’s structure.
• Age. Older trees with dry, brittle bark are more susceptible to cracking.

Young trees that aren’t yet established or species with thin bark are also prone to cracks and splits throughout the trunk. While some bark may look cracked, closer examination may reveal it’s just the texture of the tree. Key indicators of a larger issue are signs of disease, pests, and dead branches. There are ways to help determine if a cracking tree trunk can be saved.

What to do if a Tree Cracks

Once you notice a crack in your tree trunk, the first call should be to a certified arborist. A professional assessment helps evaluate the extent of the damage and determine the best course of action. In the meantime, avoid applying sealants or other commercial treatments that may trap moisture and make the problem worse. Instead, make sure you’re properly watering, mulching, and fertilizing your tree to promote healthy growth and resilience.