Trees are one of nature’s most resilient organisms, offering shade, beauty, and oxygen to our environment. While most people focus on their green foliage and roots, another essential part of their health is the bark. The bark serves as a protective layer for the tree, shielding it from pests, diseases, and physical damage, just as skin protects us. However, it’s not uncommon for trees to shed or peel off their bark, particularly in the summer months. This phenomenon can be concerning for homeowners and tree enthusiasts who may wonder: Is bark shedding in summer a cause for alarm?

Why Do Trees Shed Their Bark?

Bark shedding, also known as exfoliation, is a natural process that occurs when the tree grows. Just like humans shed skin, trees shed their bark to make room for new growth. Over time, the bark of a tree becomes rigid and old, losing its ability to expand as the tree grows. When the tree’s internal tissues need more space, the old bark peels away to reveal a fresh layer of soft, new bark beneath.

This process is most noticeable in certain species of trees and can happen at various times of the year, but it is often most visible in summer when trees are actively growing. Bark shedding can also be a response to temperature fluctuations, water stress, or even damage from insects.

Types of Bark Shedding

While bark shedding can occur naturally, it’s helpful to know the different types of bark shedding to understand when it’s simply a part of the tree’s growth and when it might signal a problem. Here are a few common types:

1. Natural Bark Shedding (Exfoliation)

For many tree species, shedding bark is part of the normal growth cycle. Certain trees, especially those with thin, smooth bark, naturally shed their bark as they mature. This type of bark shedding usually occurs gradually, and the new bark beneath is often smoother and brighter in color.

• Species Affected: Trees such as maples, birches, sycamores, citrus trees, and crape myrtles are known to shed their bark periodically, often revealing colorful or patterned new bark. For instance, the sycamore tree sheds large patches of bark in the summer, revealing bright white or tan bark beneath.
• Signs of Normal Shedding: This type of shedding is usually not concerning unless large chunks of bark are coming off, or the shedding appears to be happening in irregular or excessive patterns. In most cases, the tree will not show signs of stress or illness.

2. Damage-Induced Bark Shedding

Bark can also peel away from a tree due to physical damage, caused by storms, pests, or animal activity. This can sometimes occur in summer when environmental conditions are harsher, and the bark becomes dry or weakened. For example, severe wind or heavy rain can strip off bark, leaving the tree exposed.

Signs of Damage: If you notice that the bark is coming off in chunks, and there are visible scars or wounds on the tree trunk, it’s a good idea to inspect further. Sometimes, this kind of shedding can lead to infections or pest infestations.

3. Pest and Disease-Induced Bark Shedding

In some cases, pests like borers, beetles, or ants can invade the tree and cause damage to the bark. When these pests feed on the tree, they can create holes or tunnels beneath the bark, leading to peeling or shedding. Additionally, fungal diseases, such as canker diseases, can also result in bark loss.

Signs of Pest or Disease Problems: If bark shedding is accompanied by discolored or sunken areas, oozing sap, or noticeable holes in the bark, this may indicate a pest infestation or disease. These signs usually require prompt attention from a tree care professional to prevent further damage.

Should You Be Concerned About Bark Shedding?

While some shedding is a normal and healthy process for many trees, there are cases where bark shedding in summer could be indicative of a problem. Here are a few considerations to help determine if bark shedding is normal or if it requires intervention:

• Age and Species of Tree: As mentioned, certain species of trees naturally shed their bark in summer. If you own a tree that is known for periodic bark shedding, such as a crepe myrtle or sycamore, the shedding is most likely not a cause for concern. However, if the tree is not known for shedding bark, you may want to investigate further. It pays to monitor your trees and their health.
• Excessive Shedding: If the tree is losing large amounts of bark, or the shedding is happening too frequently, this could indicate a serious problem. Excessive shedding can stress the tree and make it more susceptible to disease, pests, and environmental stressors.

Signs of Disease or Pest Infestation

In addition, if the bark shedding is accompanied by any of the following symptoms, it’s time to investigate further:

• Visible holes or tunnels under the bark
• Soft or wet areas around the bark
• Excessive sap oozing from the tree
• Leaf discoloration or premature leaf drop
• If you notice any of these signs, it’s best to work with a certified arborist to diagnose the issue and recommend appropriate treatment.

Environmental Stress

Summer heat, drought, and water stress can cause bark to peel or shed prematurely. While trees are equipped to handle some environmental stress, prolonged drought or extreme heat can weaken the bark and cause it to separate from the tree. During hot summers, trees may also experience sunscald, where the bark becomes damaged due to intense sunlight. This typically happens on the south or southwest side of the tree, which is exposed to the greatest amount of sunlight.

What to Do About Bark Shedding

If you believe the bark shedding is a natural process, there may be no need for intervention. Simply monitor the tree and ensure that it receives proper care (water, nutrients, and occasional pruning).

However, if the shedding is excessive, accompanied by disease or pest signs, or caused by environmental stress, here are some actions to consider:

• Watering: Ensure the tree receives adequate water, especially during hot months. Deep watering encourages deep root growth, which helps the tree remain healthy.
• Pest Control: If pests are the cause, consider using organic or chemical pest control options. Before taking this step, it’s best to contact a certified arborist.
• Pruning: If you spot damaged bark, it might help to prune away the affected areas to prevent further harm and encourage healing.
• Professional Help: If you’re unsure of the cause or notice alarming symptoms, consulting an arborist is the best way to determine the root of the issue and avoid further damage.

We’re Here to Help!

In most cases, bark shedding in summer is a natural and harmless process that allows trees to grow and thrive. However, when the shedding is excessive, accompanied by signs of disease or pest infestation, or caused by environmental stress, it may require attention. By understanding the causes of bark shedding and knowing when to be concerned, you can ensure the health and vitality of your trees for years to come. Always remember, when in doubt, seek the advice of a tree care professional to keep your trees in optimal condition.

Our certified arborists and plant care specialists are experts in guiding homeowners through the process of caring for your trees, shrubs and ornamental plants for your landscaping. They can assess the health of your trees, make recommendations regarding their care, identify hazards posed by trees or limbs, and if necessary, take them down and eliminate any potential threats. Contact us today! We’re here to help!