Removing a tree is often only the first step in a complete removal project; the real battle for a clean and safe finish lies beneath the soil. Cutting tree roots is a critical phase that requires as much planning as the initial felling. Whether the goal is to clear space for construction, eliminate a hazard, or reclaim a garden, understanding how to manage these subterranean structures is essential for protecting the integrity of your property.
The Why: Reasons for Root Removal
Before picking up a saw, it is vital to identify the specific problem the roots are causing. Roots are a tree’s lifeline, seeking water and nutrients, but when they invade underground utilities, damage foundations, or buckle pavement, they transition from a natural element to a liability. Common triggers for root removal include sewer line blockages, cracked foundations, interference with driveways and sidewalks, and the preparation of a new landscape or building site.
Planning and Assessment
Identifying the Root System
Not all roots are equal. To effectively cut tree roots, you must first understand them. A tree's root system typically consists of large structural roots that anchor the tree and fine, fibrous roots that absorb water. The structural roots, usually found in the top 6 to 12 inches of soil, are the primary support. Cutting these roots can destabilize the tree, creating a safety hazard that often necessitates professional removal.
Safety and Property Considerations
Safety is paramount. Nearby power lines, underground gas, water, or sewage lines, and irrigation systems dictate where you can and cannot cut. Striking a utility line is dangerous and expensive. Furthermore, the tree's proximity to structures is critical; roots closer to a home’s foundation are less risky to cut than those near the tree’s trunk, which might cause the tree to fall unpredictably.
Methods of Cutting
Once the path is clear and the risks assessed, you can choose the appropriate method. The goal is to sever the roots cleanly to prevent tearing, which can create ragged edges that heal poorly. Two primary approaches exist: manual cutting for smaller roots and mechanical or chemical methods for larger, more established systems.
Manual Digging and Sawing
For roots up to a few inches in diameter, manual excavation is effective. Using a shovel, you can dig down to expose the root. Once exposed, a sharp handsaw, reciprocating saw, or pruning loppers can cleanly sever the root. It is generally recommended to cut roots above the point where they join the trunk, as this minimizes stress on the tree if it is still standing.
Mechanical and Stump Grinding Methods
When dealing with massive roots that are difficult to dig out, or when the entire tree and root ball need to be cleared for construction, a stump grinder or a powerful reciprocating saw with a long blade is necessary. A stump grinder can grind the root plate below the soil level, allowing for new planting or building. For targeted cutting without grinding, a chainsaw or a dedicated root cutter on an excavator can slice through the toughest woody growth.
Chemical and Natural Alternatives
If physical removal is too labor-intensive or risks damaging surrounding structures, chemical methods can be employed. Potassium hydroxide or specialized tree killer applied directly to the freshly cut stump surface will travel down the roots to kill the tree's remaining cells. This method ensures the roots do not attempt to sprout again. However, this process is slow and requires careful handling to avoid harming nearby plants.
Risks and Aftercare
Cutting roots is not without consequence. Even if the tree remains standing, severing major roots can cause dieback, making the tree more susceptible to disease and pests. In severe cases, it can lead to the tree becoming unsafe and falling. After the roots are cut, the resulting stump and dead wood should be removed. Filling the hole with fresh topsoil and compost is recommended to restore the soil structure and allow grass or new plants to thrive in the space.