If you’re noticing stripped patches or deep gouges on your trees, you’re likely searching for how to stop squirrels from eating tree bark. Squirrels gnawing on tree bark can cause significant damage, often due to territorial marking, hunger, or the need to wear down teeth. This behavior, called girdling, can severely injure or even kill your trees by disrupting the vital flow of water and nutrients.
This guide provides clear, actionable strategies to protect your trees. We’ll cover why squirrels do this and offer a range of effective solutions, from physical barriers to natural deterrents.
Protecting your investment in your landscape is important, and with the right approach, you can safeguard your trees effectively.
How To Stop Squirrels From Eating Tree Bark
Successfully protecting your trees requires a multi-faceted approach. There is rarely a single magic solution. The best method depends on your specific situation, the type of trees, and the persistence of your local squirrel population.
Combining several tactics will yield the best results. The goal is to make the tree trunk an unappealing or inaccessible target for gnawing.
Understanding Why Squirrels Chew Bark
Before implementing solutions, it helps to understand the motivation. Squirrels aren’t just being destructive; they have specific reasons for this behavior.
Knowing the “why” can help you choose the most appropriate “how” to stop them.
Dental Health
A squirrel’s teeth never stop growing. They must constantly gnaw on hard materials to wear them down and prevent overgrowth, which can lead to starvation. Tree bark provides a readily available, rough surface for this essential maintenance.
Nutritional Needs and Hydration
During late winter or early spring when food is scarce, the soft cambium layer beneath the bark becomes a source of nutrients and moisture. Squirrels will strip bark to access this sugary, sap-filled layer, especially on trees like maples and pines.
Territorial Marking and Nesting
Squirrels use scent glands in their mouths. Chewing on bark can be a way to mark their territory. Additionally, they may peel off strips of bark to use as soft, insulating lining for their dreys (nests).
Stress or Habit
In some cases, particularly with young squirrels, the behavior can become habitual or a response to stress from overcrowding or a lack of other suitable gnawing materials in their environment.
Immediate Action Physical Barriers
Physical barriers are often the most reliable and immediate way to protect tree trunks. They create a direct, tangible obstacle between the squirrel and the bark.
These methods are highly effective for focused protection on individual trees.
Tree Guards and Trunk Wrapping
Creating a physical shield around the trunk is a proven technique. You can use commercial tree guards made of plastic or metal mesh, or fashion your own from hardware cloth.
- Use 1/4-inch or 1/2-inch mesh hardware cloth. This size prevents squirrels from getting a grip or squeezing through.
- Wrap the material around the trunk, forming a cylinder. Ensure it is tall enough to cover all accessible bark—typically 4 to 6 feet high, as squirrels can jump vertically from the ground.
- Do not attach it tightly to the trunk. Leave a couple inches of space between the guard and the bark to allow for growth and air circulation.
- Secure it with wire or plastic zip ties, but check annually to ensure it doesn’t constrict the tree as it grows.
Metal Flashing or Collars
For a very smooth barrier that squirrels cannot climb, consider aluminum or sheet metal flashing. Its slippery surface is nearly impossible for them to grip.
- Measure the circumference of your tree trunk.
- Cut a piece of flashing to the correct length, with a height of about 2 feet.
- Wrap it around the trunk and secure the ends with aluminum nails or wire, again leaving room for growth.
- Ensure the top edge is smooth and bent outward to prevent squirrels from hooking their claws over it.
Be cautious with thin metals in summer, as they can heat up. Plastic spiral tree wraps are a lighter, more flexible alternative, though they may be less durable against determined chewing.
Applying Taste And Smell Deterrents
When physical barriers aren’t practical for every tree, repellents can be a useful tool. These work by making the bark taste or smell unpleasant to squirrels.
Consistency and reapplication are key, especially after rain.
Commercial Repellent Sprays
Look for non-toxic, biodegradable repellents with active ingredients like capsaicin (from hot peppers), putrescent egg solids, or garlic oil. These create an offensive taste or smell.
- Follow the manufacturer’s instructions carefully for mixing and application.
- Spray the repellent directly on the trunk and lower branches, covering the areas showing damage.
- Reapply every few weeks and after any heavy rainfall to maintain effectiveness.
- Test a small area first to ensure it doesn’t discourge or harm the tree’s bark.
Homemade Natural Deterrents
You can make effective repellents at home using common ingredients. A popular recipe involves hot peppers.
- Boil a quart of water with 2-3 tablespoons of crushed red pepper flakes for 15-20 minutes.
- Let the mixture cool completely and strain it into a spray bottle.
- Add a few drops of natural dish soap as a sticking agent.
- Spray the solution generously on the tree trunks. Reapply weekly.
Other options include sprinkling cayenne pepper powder directly on the ground around the base of the tree or hanging strong-smelling soap bars (like Irish Spring) in mesh bags from lower branches. The scent can deter some squirrels.
Modifying The Habitat And Environment
Long-term success often involves making your yard less attractive or accessible to squirrels. This strategy addresses the root causes that might be driving them to your trees.
By removing incentives and providing alternatives, you can reduce the overall pressure on your trees.
Provide Alternative Food and Water Sources
If hunger or thirst is the primary motivator, diverting their attention can help. Place squirrel feeders stocked with corn, nuts, and seeds at a distance from your prized trees.
Also, provide a shallow water source, like a birdbath with stones for footing, away from the trees you’re protecting. The goal is to give them an easier, more appealing option.
Remove Attractants and Access Points
Squirrels are agile climbers and jumpers. Trim tree branches that are within 6-8 feet of other trees, your roof, or fences. This limits their aerial highways and makes it harder to access certain trees.
Keep the area around trees clean of fallen nuts, fruits, and birdseed from other feeders, as these attract squirrels into the vicinity.
Install Squirrel Baffles
While typically used on bird feeder poles, large baffles can also be installed on tree trunks. A sturdy, cone-shaped metal or plastic baffle placed high on the trunk, facing downward, can prevent squirrels from climbing up from the ground.
Ensure the baffle is wide enough that a squirrel cannot reach around it. This method works best on isolated trees without overlapping branches from nearby plants.
Protecting Specific Types Of Trees
Some tree species are more vulnerable or appealing to squirrels than others. Young fruit trees, maples, pines, and cedars are frequent targets.
Tailoring your approach can provide better protection for these susceptible trees.
Young and Fruit Trees
Saplings and young fruit trees have tender bark and are often in open spaces, making them easy targets. For these, a full protective cylinder of hardware cloth is highly recommended.
Extend the guard a few inches into the soil to prevent burrowing at the base. For fruit trees, also consider netting the canopy to protect fruit, as this removes another food attractant.
Maple and Pine Trees
Squirrels are particularly fond of the sweet sap in maple bark and the soft bark of many pine species. For these trees, combining a trunk guard with a taste repellent can be very effective.
Apply a capsaicin-based spray on the unprotected upper bark during seasons when sap is flowing. Be aware that pine trees with damaged bark are also more suseptible to beetle infestations, so protection is crucial.
When To Call A Professional
If you have a severe, persistent infestation or are dealing with very large, valuable trees, professional help may be warranted. An arborist can assess tree health, recommend the best protection methods, and safely install barriers high in the canopy if needed.
They can also identify if other pests, like voles or rabbits, are contributing to the damage, which requires a different strategy. If squirrels are entering your home from trees, a wildlife control professional can humanely address the issue.
Remember, local regulations often protect squirrels, so relocation or lethal control is usually illegal without a permit and should not be a first resort.
Monitoring And Long-Term Maintenance
Protecting your trees is an ongoing process. Regularly inspect your trees for new signs of chewing, especially in early spring and late fall.
Check physical barriers seasonally to adjust for growth and ensure they remain secure. Reapply repellents as directed and refresh homemade sprays regularly.
By staying vigilant and adapting your tactics as needed, you can maintain healthy, squirrel-resistant trees for years to come. The effort you put in now will preserve the beauty and value of your landscape.
Frequently Asked Questions
Here are answers to some common questions about managing squirrel damage to trees.
What Can I Put On Tree Bark To Keep Squirrels Away?
You can apply commercial taste repellents containing capsaicin or garlic, or use a homemade spray of boiled cayenne pepper and water. Physical wraps like hardware cloth or metal flashing are more permanent solutions that you put on the trunk.
Will Damaged Tree Bark Grow Back?
Trees can recover from minor bark damage if the cambium layer (the greenish layer just under the bark) is not completely severed around the trunk (girdled). For small wounds, keep the area clean and let the tree heal naturally. For severe girdling, consult an arborist, who may use bridge grafting techniques to save the tree.
Do Squirrels Eat Pine Tree Bark?
Yes, squirrels commonly eat pine tree bark. They are attracted to the soft texture and the resinous sap. Pine trees, especially during winter months, are frequent targets for both nutritional gnawing and nesting material collection.
How High Should A Tree Guard Be To Stop Squirrels?
A tree guard should be at least 4 to 6 feet high from the ground. Squirrels are powerful jumpers and climbers, so a taller barrier is more effective. Also, consider if they could jump from a nearby structure or fence and adjust the height or placement accordingly.
Is It Bad For Squirrels To Eat Bark?
While it’s a natural behavior for squirrels, excessive bark chewing in residential areas often indicates a lack of preferred food sources or suitable gnawing materials. It’s not inherently bad for the squirrel, but it is detrimental to the health of the tree, which can have cascading effects on your local ecosystem and property value.