Burls are the large, swollen portions of trees that typically appear on the trunk and differ dramatically from the rest of the structure. Because they’re unsightly and easy to detect, you may wonder if they pose any danger to your vegetation. If you’re thinking of contacting an arborist about suspected burls on your trees, here’s what you should know.

A Guide to Tree Burls

What exactly are they?

Burls are essentially abnormal growths that form on trees. Although they’re usually seen on trunks, they can also appear on the tree’s base or even just underground. If that’s the case, you might notice a round “swelling” rising through the soil. Burls usually begin very small, but can grow quickly and even develop sprouts.

How do they develop?

The precise cause isn’t always determinable. Usually, tree stress of some sort is to blame. Issues such as insect infestations, mold formation, injuries, and viruses can all cause structural problems like burls. It’s also possible that environmental issues, like pollution or even the condition of the soil, could cause burls to form.

Can they cause problems?

Generally, burls are harmless, but if they’re caused by an underlying issue, it should be treated promptly. Problems like insect infestations and illness will not go away on their own and could worsen with time.

When should you call an arborist?

Since the cause of a burl isn’t always easy to figure out, an arborist may want to take a closer look if one develops suddenly. Treating an insect infestation or freeze damage, for example, can help salvage the structure and prevent future problems. Your tree service technician can also trim away the sprouts if you’re concerned about their appearance.

If you spot burls on any trees in your property, trust the team at Nelson Tree Company. Their knowledgable arborists provide expert tree services throughout Westmoreland County, PA, including tree care, stump removal, and pruning. Visit them online for information, or call (724) 863-7682 to schedule an appointment.