Why Your Tree Has Exposed Roots (Calgary Arborist Guide to Surface Roots & Yard Damage)

Exposed or above-ground tree roots are a very common issue in Calgary yards. Many homeowners notice roots snaking across the lawn, lifting sidewalks, surfacing near the trunk, or becoming visible after heavy rains. These roots can be unsightly, difficult to mow around, and even cause tripping hazards. More importantly, exposed roots often indicate soil problems, tree stress, or structural issues beneath the surface.

At Calgary Tree Care, our ISA Certified Arborists assess exposed root problems across the city. Calgary’s clay soil, dry climate, chinook cycles, and shallow watering practices all contribute to surface root development—especially in common local species like poplar, aspen, spruce, and maple.

This comprehensive guide explains why tree roots come above ground, what it means for your tree’s health, and what homeowners can safely do about it.

Why Trees Develop Exposed Roots in Calgary

Tree roots naturally seek oxygen, moisture, and stability. When soil conditions make these hard to find, roots grow upward instead of downward.

The most common reasons include:

1. Calgary’s Hard, Compacted Clay Soil

Calgary’s clay-heavy soil makes it difficult for roots to penetrate deeply. Over time, soil compaction gets worse due to:
• Foot traffic
• Mowing and yard equipment
• Construction
• Dry summers
• Lack of organic matter

Hard, airless clay forces roots toward the surface where oxygen is more available.
This is one of the main reasons exposed roots are so widespread in older Calgary neighbourhoods.

2. Shallow Watering Practices

Many homeowners water frequently but not deeply. This trains roots to stay near the surface where moisture collects after brief irrigation or light rain.

Shallow watering causes:
• Surface rooting
• Poor anchoring
• Higher drought sensitivity
• Greater exposure during dry spells

Deep, infrequent watering encourages roots to grow downward.

3. Natural Growth Habits of Certain Species

Some common Calgary trees naturally produce shallow surface roots, even in ideal conditions. These species include:
• Poplar
• Aspen
• Willow
• Birch
• Manitoba maple
• Spruce
• Cedar

These trees evolved to grow roots close to the surface to maximize oxygen and moisture intake.

4. Erosion or Soil Loss

Wind, runoff, drought, and chinook cycles often strip away the thin topsoil layer covering roots.

Signs include:
• Roots becoming visible over time
• Soil receding around the trunk
• Patchy, thinned grass near the tree base
• Roots appearing after heavy rainfall

In Calgary’s dry climate, soil erosion is extremely common in unmulched yards.

5. Trunk Flare Buried at Planting

If the tree was planted too deep—or if soil or mulch was piled against the trunk—the root flare may have grown upward seeking oxygen.

This leads to:
• Girdling roots
• Surface root formation
• Long-term structural instability

Buried root flares are one of the leading causes of surface roots in newer developments.

6. Root Damage or Construction Injury

Roots often surface after:
• Sidewalk installation
• Trenching for irrigation
• Utility work
• Fence post digging
• Grade changes

When deeper roots are cut or damaged, the tree compensates by producing new surface roots.

7. Aging Trees & Expanding Root Systems

Mature trees naturally expand their root zones over decades. As roots thicken, they rise closer to the surface.

This is normal, but may still require management for safety or lawn maintenance.

Are Exposed Roots Dangerous?

Exposed roots can be dangerous, depending on the situation.

They may indicate:
• Shallow anchoring (increasing risk of blowing over)
• Compromised root health
• Soil problems
• Poor structural stability
• Root decay or disease
• Inefficient water uptake

Surface roots also create tripping hazards, interfere with mowing, and damage hardscaping.

A professional assessment determines whether roots are simply cosmetic or a structural concern.

What Homeowners Should NEVER Do

Many common DIY fixes damage or kill the tree.

Do not:
• Cut exposed roots
• Bury them under deep soil
• Chop roots to install grass
• Use a shovel to “shave down” roots
• Cover roots with solid plastic or landscape fabric
• Wrap roots tightly
• Pile mulch too high against the trunk

Cutting roots, especially large ones, destabilizes the tree and increases decay risk.

Safe Ways to Manage Exposed Roots

There are several safe, arborist-approved methods to deal with surface roots.

1. Mulch the Root Zone

A 2–4 inch layer of mulch:
• Protects roots
• Reduces erosion
• Improves moisture retention
• Prevents mower damage
• Improves soil quality over time

Mulching is the single best solution for most exposed root problems.

2. Create a Designated Mulch Bed

Remove grass around the base of the tree and replace it with:
• Wood mulch
• Bark chips
• Decorative groundcover stones (with a fabric barrier above—not below—the roots)

This eliminates the struggle of trying to grow grass over thick, shallow roots.

3. Improve Watering Practices

Deep watering encourages downward root growth.
Watering should reach 6–12 inches deep, especially during Calgary’s dry summers.

4. Address Soil Compaction

Arborists can:
• Aerate the soil
• Amend clay with organic matter
• Use air excavation tools (AirSpade) to loosen and restore soil structure

This encourages root penetration and may reduce future surface rooting.

5. Stabilize or Correct Root Flare Issues

If the root flare is buried, careful excavation exposes it and restores tree health.

When Exposed Roots Mean the Tree Is Failing

Serious problems may be present if you see:
• Soft, rotting roots
• Mushrooms around the base
• Cracking soil from root movement
• Bark sloughing off exposed roots
• Significant leaning
• Sparse canopy
• Large dead branches
• Sections of trunk dieback

These signs require immediate assessment.

Why Choose Calgary Tree Care

Our ISA Certified Arborists, with more than 15 years of Calgary-specific experience, provide:
• Root health assessments
• Soil and compaction analysis
• AirSpade soil restoration
• Mulching and root flare correction
• Advice for lawn redesign around root-heavy trees
• Honest guidance on long-term tree health

We help homeowners protect both the tree and their property.

Schedule a Root Zone Assessment

If your tree has exposed roots—or you’re not sure whether they indicate a problem—contact Calgary Tree Care for a professional evaluation. Protect your tree, your yard, and your long-term landscape health.