Ask the Experts

How to Protect Mature Trees During Construction and Landscape Renovation 

Construction and landscape renovations often focus on what is being built, but long-term success frequently depends on what is preserved. 

Mature trees provide shade, environmental benefits, and character that can take decades to establish. Yet during construction, they are often exposed to some of the greatest stress they will ever experience. Soil compaction, root damage, grade changes, and equipment traffic can all create problems that may not become visible until years after a project is complete. 

Protecting trees during construction requires more than avoiding visible trunks and branches. It requires understanding how trees grow below ground and developing a plan that preserves critical root systems throughout every phase of a project. 

At Southern Botanical’s recent SMU “The Boulevard” renovation, protecting more than 65 mature live oaks became one of the defining priorities of the project. The strategies used there provide a useful example of how construction around mature trees can be approached successfully. 

Why Is Protecting Trees During Construction So Important? 

Most of a tree’s critical root system exists well beyond the trunk and often lies within the top few inches of soil. 

While damage to branches is easy to see, root damage frequently occurs unnoticed during excavation, grading, or equipment movement. Once roots are damaged, trees may slowly decline over several years, making it difficult to link the symptoms to the original construction activity. 

For mature trees, prevention is significantly more effective than remediation. The earlier tree protection is integrated into project planning, the greater the likelihood of long-term success. 

What Happens When Trees Are Damaged During Construction? 

Construction-related tree damage often develops slowly, making it difficult to recognize until years after a project is complete. 

When root systems are damaged or compacted, trees may experience: 

  • Declining canopy density 
  • Increased susceptibility to pests and disease 
  • Reduced drought tolerance 
  • Branch dieback 
  • Structural instability 
  • Premature tree loss 

Because mature trees can take decades to replace, the cost of poor planning often far exceeds the investment required for proper protection measures. This is why protecting trees during construction should be treated as a core project objective rather than a secondary consideration. 

What Are the Biggest Threats to Trees During Construction? 

Construction projects create many threats to mature trees. These include soil compaction, root damage, and grade changes. Tree damage rarely comes from a single event. More often, it results from cumulative stress. 

Soil Compaction 
Heavy equipment can compress soil particles, reducing the oxygen and water movement roots need to survive. Compacted soil limits root growth and can create long-term health issues even when the tree initially appears unaffected. 

Root Damage 
Excavation, trenching, and grading activities can sever roots that support water uptake and structural stability. This is especially concerning around mature trees that have spent decades developing extensive root systems. 

Grade Changes 
Adding or removing soil around a tree can significantly alter growing conditions. Excess soil can bury root flares, while excessive excavation can expose sensitive roots. 

These risks make tree root protection a critical component of any landscape renovation or construction project. 

What Is Air-Spading and Why Is It Used Around Trees? 

Air-spading is one of the most effective tools available for protecting trees during construction. 

Rather than using traditional excavation equipment, air-spading uses compressed air to safely remove soil around root systems without cutting or damaging roots. This allows arborists to expose root flares, identify critical roots, and establish safe working boundaries before construction begins. 

During our renovation of The Boulevard on SMU, Southern Botanical’s ISA Certified Arborists used air-spading around each live oak before excavation activities started. 

“What distinguished this initiative from a standard re-sodding project was our absolute commitment to preserving the health of the site’s monumental live oaks,” said SMU Account Executive Zavier Cabral. 

The process allowed crews to clearly identify where heavy equipment could safely operate and where additional protection was required. 

What Is a Tree Protection Zone? 

A tree protection zone is an area that limits construction activity around the tree’s roots. Once root systems are identified, arborists can establish these protection zones to prevent construction-related damage.  

Equipment Exclusion Zones 

These designated areas prevent heavy machinery from entering sensitive root zones. Restricting equipment access helps reduce soil compaction and minimizes the risk of accidental root damage. 

During the SMU project, crews established clear exclusion boundaries around every protected tree. 

“There was a buffer zone created that we all agreed the machines wouldn’t get any closer to. All in an effort to prevent any root damage,” said Production Manager Brittney Oden. 

Construction Planning and Communication 

Protection zones are only effective when every contractor understands and follows them. This requires communication, training, and ongoing site supervision throughout construction. Tree preservation succeeds when it becomes part of the project workflow rather than an afterthought. 

Lessons Learned From Protecting More Than 65 Live Oaks 

The Boulevard’s renovation at SMU reinforced several important principles about protecting mature trees during construction. 

  • Tree preservation should begin during project planning, not after construction starts. 
  • Air-spading can identify critical root zones before excavation occurs. 
  • Equipment exclusion zones reduce the risk of compaction and root damage. 
  • Arborists, landscape contractors, and property owners should collaborate throughout the project. 

These practices help reduce risk and improve long-term outcomes for valuable trees. 

Why Tree Preservation Should Be Part of Every Landscape Renovation 

Mature trees are often among the most valuable assets on a property. Replacing them can take decades, while protecting them during construction is often far more achievable. 

Whether you’re managing a university campus, corporate headquarters, municipality, HOA, or commercial property, incorporating tree protection measures into project planning can preserve both landscape value and long-term environmental benefits. 

Working with ISA Certified Arborists and experienced landscape professionals helps ensure that construction goals and tree preservation goals can succeed together. 

Partner With Experts in Tree Protection and Landscape Renovation 

Protecting mature trees requires specialized knowledge, careful planning, and coordination across multiple disciplines. 

Southern Botanical’s Dallas Commercial Tree Care and Commercial Enhancements teams work together to help property owners navigate complex construction and renovation projects while preserving valuable tree assets. From air-spading and root zone protection to vertical mulching and long-term tree care, our teams develop strategies that support both project success and tree health. 

If you’re planning a landscape renovation or construction project in the Dallas-Fort Worth area, our team can help create a plan that protects the trees that make your property unique. 

Frequently Asked Questions 

What is the biggest threat to trees during construction? 
Soil compaction and root damage are among the most common causes of construction-related tree decline. 

What is air-spading? 
Air-spading uses compressed air to safely remove soil around roots without damaging them, allowing arborists to inspect and protect critical root systems. 

How do you protect tree roots during construction? 
Common methods include air-spading, root zone mapping, equipment exclusion zones, and careful construction sequencing. 

What is vertical mulching? 
Vertical mulching is a soil improvement technique that helps reduce compaction and improve oxygen movement around tree roots. 

Why are root flares important? 
Root flares help indicate proper tree depth and health. Exposing buried root flares can improve growing conditions and reduce long-term stress. 

When should tree protection planning begin? 
Tree protection planning should begin during the earliest stages of project design and construction planning.