How To Fix Exposed Tree Roots – Professional Solutions For A Safer
The safest and most effective way to address surface roots is to cover them with a 2-to-3-inch layer of organic mulch, such as wood chips or shredded bark. Avoid adding more than two inches of heavy topsoil, as this can suffocate the tree by cutting off oxygen to the feeder roots.
If mulching isn’t an option, consider planting shade-tolerant ground covers or creating a dedicated landscape bed around the base of the tree to eliminate the need for mowing in that sensitive area.
Do you find yourself constantly tripping over thick, woody bumps in your lawn? Perhaps your lawn mower blades keep hitting something hard, sending jarring vibrations through your arms and dulling your equipment.
You are not alone in this struggle, as many homeowners deal with surface-level growth from mature trees. Learning how to fix exposed tree roots is essential for maintaining both the safety of your family and the long-term health of your landscape.
In this guide, I will walk you through the professional methods to manage these roots without harming the tree. We will look at why this happens and explore the best materials to use for a permanent, beautiful solution.
Understanding Why Tree Roots Surface
Before we jump into the tools and techniques, we must understand why those roots are appearing above ground. Most people assume the roots are “pushing up,” but the reality is often the opposite.
Over many years, wind and rain wash away the top layer of soil in a process called erosion. As the soil disappears, the structural roots that were once buried become visible to the naked eye.
Another common cause is soil compaction, which often happens in high-traffic areas or yards with heavy clay content. When soil becomes too dense, roots grow closer to the surface to find the oxygen and moisture they need to survive.
Finally, some species are simply prone to surface rooting. If you have a Silver Maple, a Beech, or a Willow, you are more likely to see this behavior regardless of your soil quality.
The Dangers of Leaving Roots Exposed
Ignoring surface roots might seem like the easiest path, but it presents several risks to your property and the tree itself. The most immediate concern for many is the safety hazard they create for children or elderly guests.
From a maintenance perspective, exposed roots are a nightmare for lawn care. Your mower blades can easily scalp the bark off a root, leaving the tree vulnerable to pests and diseases like verticillium wilt or wood rot.
When the cambium layer—the living part of the wood just under the bark—is damaged, the tree loses its ability to transport nutrients. Repeated strikes from a mower can eventually kill even a massive, century-old oak.
Furthermore, exposed roots are sensitive to extreme temperatures. Without a soil blanket, they can freeze in the winter or bake in the summer sun, leading to significant stress for the entire plant.
Step-by-Step Instructions on how to fix exposed tree roots
When you are ready to take action, the goal is to provide protection without causing suffocation. Follow these steps to ensure a professional result that lasts for seasons to come.
1. Clear the Area Carefully
Start by removing any struggling grass or weeds from between the exposed roots. Do not use a heavy tiller or a sharp spade, as you might accidentally slice into the root flare.
Use your hands or a small hand trowel to pull weeds. If the grass is thick, use a string trimmer to cut it down to the soil level before proceeding with your cover material.
2. Apply a Thin Layer of Soil (Optional)
If the erosion is deep, you can add a very thin layer of high-quality topsoil or a compost mix. Never add more than one inch of soil at a time to the area.
Choose a loose, loamy soil that allows for gas exchange. Avoid heavy clay or pure sand, which can either trap too much water or dry out far too quickly.
3. Layer Organic Mulch
This is the gold standard for root protection. Spread a 2-to-3-inch layer of organic mulch, such as wood chips, cedar bark, or pine needles, over the entire area.
Mulch acts as a shock absorber for foot traffic and lawn equipment. It also retains moisture and slowly breaks down to provide essential nutrients like nitrogen and carbon back into the earth.
4. Maintain the “Donut” Shape
When applying mulch, never pile it against the trunk of the tree. This is often called “volcano mulching,” and it is a leading cause of root rot and fungal infections.
Keep the mulch at least 6 inches away from the base of the tree. This ensures the bark stays dry and allows the tree to breathe while the roots further out remain protected.
Why You Should Never Cut Exposed Roots
It is tempting to grab a saw or an axe and simply remove the offending root. However, this is one of the most dangerous things you can do to a mature tree.
Large surface roots are often structural anchors. Cutting even one major root can make the tree unstable, increasing the risk of it falling over during a high-wind event or a heavy storm.
Additionally, roots are the “mouths” of the tree. Removing them significantly reduces the tree’s ability to take up water, which can lead to canopy dieback and a slow, expensive death for the specimen.
If a root is absolutely causing damage to a foundation or a sidewalk, you must consult a certified arborist. They can perform “root pruning” safely using specialized tools and knowledge.
Alternative Solutions: Ground Covers and Borders
Sometimes, simply covering the roots with mulch isn’t enough to satisfy your aesthetic goals. In these cases, creating a dedicated landscape bed is a fantastic alternative.
By defining the area with a natural border, you signal to everyone that this is a “no-mow” zone. This protects the tree from equipment and creates a beautiful focal point in your yard.
Choosing the Right Ground Covers
Since large trees create heavy shade, you need plants that thrive in low-light conditions. Consider using Pachysandra terminalis or Vinca minor to create a green carpet over the roots.
These plants have shallow root systems that won’t compete heavily with the tree for nutrients. They naturally hide the bumps and ridges of the exposed tree roots while providing a lush look.
Using Physical Borders
You can use natural stone, bricks, or heavy timber to create a border around the mulched area. This keeps the mulch contained and prevents it from washing away during heavy summer thunderstorms.
Avoid using plastic edging that requires deep trenching. Slicing into the ground to install plastic strips often damages the very feeder roots you are trying to protect.
Essential Tools for the Job
To do this job correctly, you don’t need expensive machinery. A few high-quality hand tools will make the process much smoother and safer for the tree.
- Square-point shovel: Better for scooping mulch without digging deep into the ground.
- Stiff-tine rake: Perfect for leveling the mulch and spreading it evenly between roots.
- Wheelbarrow: Essential for transporting heavy bags of mulch or bulk soil to the site.
- Garden gloves: Protect your hands from splinters and potential soil-borne bacteria.
If you are working on a large area, buying mulch in bulk from a local landscaping supply yard is often much cheaper than buying individual bags at a big-box store.
Seasonal Maintenance for Root Health
Fixing the roots isn’t a one-time event. Because organic mulch breaks down over time, you will need to replenish the layer every year or two.
Check the depth of your mulch every spring. If it has thinned out to less than an inch, add a fresh layer to maintain the insulation properties and weed suppression.
During periods of extreme drought, water the mulched area deeply. Even though the roots are covered, they still need consistent moisture to support the large canopy above.
Avoid using heavy fertilizers directly on the exposed roots. Instead, focus on improving the overall soil health of your entire lawn with a balanced NPK ratio (Nitrogen, Phosphorus, Potassium) fertilizer during the growing season.
Common Mistakes to Avoid
Even with the best intentions, it is easy to make mistakes that could harm your landscape. Avoid these common pitfalls when figuring out how to fix exposed tree roots on your property.
First, never use landscape fabric under the mulch around a tree. This fabric eventually clogs with silt and prevents oxygen and water from reaching the roots, effectively suffocating the tree over time.
Second, do not use pea gravel or large stones as a primary cover. Rocks hold heat and can “cook” the roots during the hot summer months, leading to moisture stress and leaf scorch.
Finally, avoid “raised beds” around trees. Building a retaining wall and filling it with two feet of soil will kill almost any tree within a few years by cutting off all gas exchange to the root system.
Safety First: Protecting Yourself and Your Property
Working in the garden always carries some risk. When handling mulch or soil, be mindful of your back and use proper lifting techniques by bending at the knees.
If you notice that the tree has large, fungal growths (mushrooms) growing directly out of the roots or the trunk, stop what you are doing. This is a sign of internal decay.
In such cases, covering the roots won’t solve the underlying problem. You should contact a professional to assess if the tree is still structurally sound before spending time on cosmetic fixes.
Frequently Asked Questions
Can I just pour concrete over the roots?
No, you should never pour concrete or asphalt over tree roots. This completely seals off the soil from water and air, which will lead to the rapid death of the tree and potential property damage.
Is it okay to use grass seed over the roots?
While you can try, grass rarely grows well directly over large surface roots because it cannot compete for moisture. Mulch or ground covers are much more successful and sustainable options.
How thick should the mulch be?
The ideal thickness is between 2 and 3 inches. Any thinner and it won’t suppress weeds or protect the roots; any thicker and it might prevent oxygen from reaching the soil.
What is the best time of year to fix roots?
Spring and fall are the best times. The moderate temperatures allow you to work comfortably, and the tree is in a better position to adapt to the new layer of protection.
Conclusion: A Healthier Future for Your Trees
Taking the time to learn how to fix exposed tree roots is an investment in your home’s value and your family’s safety. By choosing mulch over mowers, you are ensuring your trees live a long, vibrant life.
Remember that patience is key when working with nature. Start small, use high-quality organic materials, and always prioritize the biological needs of the tree over quick cosmetic fixes.
Grab your shovel and a few bags of cedar mulch this weekend. Your feet, your lawn mower, and your beautiful trees will all thank you for the extra care!
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