How To Tell if a Tree Is Rotten Inside

tree is rotten inside

Sometimes, it’s easy to see that a tree in your yard is struggling. It’s much harder to know when something’s wrong beneath the bark. And when you don’t know how to tell if a tree is rotten inside, decay can spread undetected until the compromised tree structure causes it to die or fall. There are some internal tree decay clues you can keep an eye out for, though, that can make a big difference in whether you can save the tree or not.

A Professional Tree Service in Colorado Springs, CO, Keeps Trees Healthy

Professional care plays a big role in maintaining healthy trees. A tree service in Colorado Springs, CO, can inspect trees for hidden damage and create a maintenance plan that supports long-term health. This may include regular trimming and pruning to improve airflow, reduce moisture buildup that encourages fungal growth and rot, and remove sick or dead branches before they spread decay.

Since a weak or overgrown tree can fall during a storm, being proactive protects your family and property. Nipping issues in the bud helps everything stay safe and attractive in unpredictable Colorado weather.

Signs of Internal Tree Rot 

Identifying rot early is essential to ensure the health of your trees. However, it can be challenging because internal tree decay often starts deep within the trunk or branches. From the outside, a tree may have green leaves and look fine, while the inside is breaking down. The clues to how to tell if a tree is rotten inside may seem small, but together they can point to a bigger problem.

Hollow or Soft Areas

A hollow trunk is a major red flag. Tap the trunk with a rubber mallet or your knuckles. If it sounds hollow or feels soft, it may indicate internal decay. 

You may also notice cracks, sunken areas, spongy spots, and mushy areas around the base of the trunk and roots. 

Fungal Growth  

Fungal growth on trees means something’s going on under the bark. Mushrooms or shelf-like growths on the trunk or at the base often mean wood decay fungi are present and may have already compromised the heart of the tree.

Dead Branches and Sparse Leaves

A tree with large dead branches, thinning leaves, or sections that never leaf out may be struggling from the inside. These signs of tree rot point to deeper structural issues.

Sometimes, the leaves themselves give it away, too. If branches are dying off unevenly or the canopy appears thin, hidden rot could be starving the tree from the core.

Insect Activity

Ants, termites, and beetles are attracted to soft, decaying wood. Heavy insect traffic around a tree can be a clue that internal tree decay is already underway.

Call a Professional for Help

If you suspect rot, don’t wait for something to go wrong. A certified arborist knows how to tell if a tree is rotten inside and can suggest the right next steps. Call Arbor One Tree Service LLC at (719) 256-0484 today to schedule an inspection and stop the spread of harmful tree diseases before they cause serious damage.

Picture of Sean Stouffis
Sean Stouffis

Sean Stouffis is the Founder and Lead Arbor Care Specialist at Arbor One Tree Service LLC, serving residential and commercial clients across El Paso and Pueblo Counties. Since establishing the company in 2020, Sean has dedicated himself to delivering expert, safety-first tree care, ranging from complex removals and precision trimming to 24/7 emergency storm response. Backed by ISA-certified arborists on staff, Sean leads his Fountain-based, family-owned business with a core focus on Central Colorado's plant health, exceptional customer service, and reliable, community-first standards.

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