Tree pruning might seem simple, but one wrong cut can cause years of damage. While trimming can improve tree health, shape, and safety, improper pruning techniques often lead to decay, weakened limbs, or even tree death.

Homeowners across Raleigh, NC, and surrounding areas often make these common mistakes—sometimes without realizing it. Whether you’re managing your yard or hiring a landscaping crew, understanding what to avoid can protect your trees for years to come.

Here are 10 tree pruning mistakes to steer clear of—and how to prune properly for long-term tree health.

1. Topping the Tree (Severe Over-Pruning)

Topping, or cutting off the upper canopy of a tree, is one of the most damaging practices. While some think it reduces height and risk, it actually creates stress, weakens the structure, and leads to brittle, fast-growing sprouts.

Instead, opt for crown reduction—a controlled technique that carefully reduces height while preserving structure. The NC State Extension strongly advises against topping, noting it increases vulnerability to pests and decay.

2. Cutting Too Close to the Trunk (Flush Cuts)

Flush cuts remove the branch collar, the slightly swollen area where the branch meets the trunk. This collar plays a vital role in healing.

Removing it prevents the tree from sealing the wound, leaving it exposed to disease and rot. Always cut just outside the branch collar to support natural healing.

3. Pruning at the Wrong Time of Year

Timing matters. Pruning during the wrong season can harm a tree’s ability to recover and may trigger unwanted new growth.

• Late summer or fall pruning encourages weak shoots before winter.
• Trimming spring-flowering trees in winter may remove next season’s blooms.

In most cases, late winter or early spring—before bud break—is the best time to prune. The National Association of State Foresters recommends timing based on tree species and local climate conditions.

4. Using Dull or Dirty Tools

Jagged cuts from dull blades take longer to heal and increase the risk of infection. Dirty tools can also transfer disease from one tree to another.

Keep your pruning tools sharp and clean. Even a quick wipe-down can reduce sap buildup and prevent damage during cuts.

5. Removing Too Many Branches at Once

Over-pruning depletes a tree’s energy reserves. When more than a third of the canopy is removed, trees can go into shock—making them more susceptible to pests and disease.

If major trimming is needed, plan to space it out over multiple seasons.

6. Ignoring Dead or Diseased Branches

Neglecting deadwood creates safety hazards and can lead to pest infestations. Diseased branches are also a threat to the rest of the tree.

Promptly removing compromised limbs helps maintain overall health and reduces the spread of infection. Learn more about professional pruning services from A+ Tree & Crane if you’re unsure what to remove.

7. Not Considering the Tree’s Natural Shape

Pruning should enhance a tree’s natural form—not reshape it completely. Over-trimming or creating unnatural angles may result in unstable branch growth or permanent damage.

Before making any cuts, step back and evaluate the tree’s overall balance.

8. Leaving Large Stubs Behind

Cutting too far from the trunk leaves behind “hanging stubs” that won’t heal properly. These stubs become prime entry points for insects and decay.

Always cut just outside the branch collar—close enough to heal, but never flush with the trunk.

9. Not Pruning for Structural Stability

Young trees need careful structural pruning to avoid future issues. Without early guidance, branches can become crowded, cross each other, or form weak attachments.

Proper early pruning sets trees up for decades of healthy, stable growth.

10. DIY Pruning Without Professional Guidance

Some pruning jobs are best left to the pros—especially with:

• Large trees near structures or power lines
• Diseased or storm-damaged limbs
• Trees that need crown thinning or height reduction

Hiring a certified arborist ensures your trees are pruned safely and strategically. When in doubt, schedule an inspection with a professional.

How to Prune Trees the Right Way

Proper pruning is about knowing what to cut—and what not to. Here are a few golden rules:

• Use clean, sharp tools
• Cut at the branch collar—not flush or too far out
• Don’t remove more than 30% of the canopy at once
• Time pruning to match the species and season
• When in doubt, hire a certified professional

For large trees or complex jobs, A+ Tree & Crane provides expert pruning services across Raleigh, Durham and the surrounding areas in The Triangle.

When to Call a Professional

Call in the experts if:

• The tree is too tall or wide to safely reach
• Branches are near homes, power lines, or busy roads
• You notice signs of disease, pest infestation, or decay
• The tree was recently storm-damaged or is overgrown
• You notice one or more signs on our blog for How to Spot a Dangerous Tree Before It’s Too Late

A+ Tree & Crane is a trusted partner for safe, healthy, and effective tree care. We offer professional assessments, preventative maintenance, and emergency tree services to keep your landscape safe year-round.

A+ Tree & Crane: Your Trusted Partner in The Triangle

Improper pruning can shorten a tree’s lifespan—but with expert care, your trees can thrive for decades. At A+ Tree & Crane, our certified team ensures every cut supports growth, health, and safety.

Whether you need seasonal maintenance or have a tree in trouble, we’re here to help. Contact us today to schedule your consultation and keep your trees strong, beautiful, and storm-ready.