Tree Planting Mistakes to Avoid

Planting a tree may look like a simple weekend project: dig a hole, drop the tree in, add soil, and water. But in reality, tree planting is both a science and an art. Small mistakes at the start can set a tree up for decades of problems—or even premature death.

In Calgary, where chinook winds, droughts, and extreme winters already stress trees, proper planting is even more critical. By avoiding a few common mistakes, you can help your new tree thrive for generations instead of struggling to survive.

Mistake #1: Planting Too Deep

One of the most frequent and damaging errors is planting trees too deep. Roots need oxygen to function, and burying them too far below the soil suffocates the tree.

The trunk flare—where the trunk widens at the base—should always be visible just above ground level. If the flare is buried, roots may circle around the trunk instead of spreading outward, eventually strangling the tree.

The Fix: Dig a wide, shallow hole and position the root flare slightly above ground level. Backfill with native soil instead of rich potting mixes, which can create water imbalances.

Mistake #2: Planting Too Close to Buildings or Utilities

Another common issue is failing to consider a tree’s mature size. A small sapling may look fine next to a fence, driveway, or power line, but decades later it can cause major conflicts.

Roots may crack sidewalks and interfere with foundations. Branches may scrape against siding, grow into roofs, or tangle with overhead wires. These conflicts often lead to costly pruning—or premature removals.

The Fix: Research the tree’s mature size and plan ahead. Large trees like spruce or oaks need ample space away from buildings, while columnar species such as Swedish aspen work better in narrow spaces. An ISA Certified Arborist can design a planting layout that avoids long-term headaches.

Mistake #3: Choosing the Wrong Species

Calgary’s climate is not kind to trees. Cold winters, sudden chinooks, dry summers, and alkaline soils limit what species will thrive here. Unfortunately, many homeowners choose trees based on looks or fast growth, only to watch them fail.

For example, poplars and willows grow quickly but have invasive root systems that damage sidewalks and sewer lines. Exotic ornamentals often struggle with Calgary’s soil and temperature swings.

The Fix: Choose hardy species adapted to the local environment. Great options include bur oak, lodgepole pine, spruce, and amur maple. Smaller ornamentals like flowering crabapple also perform well. A Certified Arborist can match species to your specific soil, light, and space.

Mistake #4: Poor Watering Practices

Watering is one of the most misunderstood aspects of tree planting. Overwatering can drown roots and encourage root rot, while underwatering leaves young trees stressed and vulnerable.

Best Practices for Calgary:

• Young Trees – Water deeply 1–2 times per week during the first 3 years, especially in hot, dry spells.

• Mature Trees – Water slowly and deeply once or twice a month in summer droughts.

• Fall Watering – Before the ground freezes, give your trees a final deep watering. This ensures they enter winter well-hydrated, reducing stress from frozen soil.

The key is consistency—deep, infrequent watering encourages strong root systems, while frequent shallow watering creates weak, surface-level roots.

Mistake #5: Incorrect Mulching

Mulch is one of the best tools for tree health, but it’s often applied incorrectly. The most common error is “volcano mulching”—piling mulch up against the trunk.

This traps moisture against bark, leading to rot, pests, and fungal growth.

The Fix: Spread mulch in a wide ring around the tree, 2–4 inches deep, but keep it pulled back several inches from the trunk. Proper mulching conserves water, regulates soil temperature, and suppresses weeds without harming the tree.

Mistake #6: Skipping Professional Guidance

Perhaps the biggest mistake is assuming tree planting doesn’t require expertise. While landscapers may plant for aesthetics, trees are complex living structures with unique biological needs. Poor planting decisions often don’t show their consequences for years—when it’s too late to fix them.

The Fix: Hire an ISA Certified Arborist for planting. Arborists ensure proper depth, spacing, and species choice. They also provide aftercare instructions tailored to Calgary’s climate, soil, and common pests. This professional guidance prevents costly mistakes and protects your investment.

The Role of a TRAQ-Qualified Arborist

Beyond planting, a TRAQ-qualified arborist (Tree Risk Assessment Qualification) can evaluate whether a planting location is safe long-term. They assess soil conditions, nearby structures, and potential risks, helping you make informed decisions before you dig.

This level of expertise is especially valuable in Calgary, where strong winds and heavy snow regularly test tree stability.

The Bottom Line: Plant Smart for Long-Term Success

Planting a tree isn’t just about filling a hole—it’s about setting up decades of health, safety, and growth. By avoiding mistakes like planting too deep, choosing the wrong species, or mulching incorrectly, you give your tree the best chance to thrive.

With guidance from an ISA Certified Arborist, your tree planting becomes a long-term investment, not a short-term gamble. The right tree, in the right place, planted the right way, will provide shade, beauty, and value for generations.