Tree Mulching Mistakes That Harm More Than They Help

Trevor Soltys & Paul Kasper

Mulch is one of the best things you can give your trees — but only when it’s applied correctly.

When mulch is used the wrong way, it can trap moisture, attract pests, weaken the trunk, and even kill a healthy tree over time.

Here are the most common mulching mistakes we see in Winnipeg yards, and how to fix them so your trees stay strong and healthy.


1. “Volcano Mulching” Around the Trunk

A mulch “volcano” is when mulch is piled high against the trunk.

It looks tidy, but it causes:

  • Bark rot
  • Moisture buildup
  • Pest and fungus problems
  • Girdling roots
  • Trunk decay

Correct method: 

Keep mulch 3–6 inches away from the trunk.

The base of the tree should always be visible.

2. Using Too Much Mulch

A thick layer of mulch can:

  • Suffocate roots
  • Prevent oxygen from reaching the soil
  • Encourage shallow, weak root growth
  • Trap too much moisture

Correct method: 

Keep mulch 2–4 inches deep, spread evenly.


3. Using the Wrong Type of Mulch

Avoid:

  • Dyed mulch
  • Mulch with unknown fillers
  • Mulch that smells sour or moldy

These can introduce toxins or pests into your soil.

Correct method: 

Use clean, natural, organic mulch that breaks down slowly and enriches the soil.


4. Mulching Too Close to the Roots

Mulch should protect the root zone — not smother it.

If mulch is piled directly over exposed roots, it can:

  • Trap moisture
  • Encourage fungal growth
  • Cause roots to rot

Correct method: 

Spread mulch in a wide, even ring, ideally reaching the tree’s drip line.


5. Not Refreshing Mulch Properly

Old mulch can compact over time, preventing water and air from reaching the soil.

Correct method: 

Each spring:

  • Rake and fluff old mulch
  • Remove excess buildup
  • Add a thin fresh layer if needed

Why Proper Mulching Matters

Correct mulching:

  • Protects roots
  • Regulates soil temperature
  • Reduces weeds
  • Conserves moisture
  • Improves soil health
  • Helps young trees establish faster

Done wrong, it can quietly damage your tree for years before symptoms appear.


Need Help With Tree Health or Mulching?

If you’re unsure whether your trees are mulched correctly — or if past mulching may have caused damage — our team at TreeSolve can help.

We offer:

  • Tree health assessments
  • Professional pruning
  • Tree removal (when necessary)
  • Stump grinding
  • Tree cabling & support systems
  • Emerald Ash Borer injections

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πŸ‘‰ Contact us: https://www.treesolve.ca/contact-us 

πŸ‘‰ Tree Removal: https://www.treesolve.ca/services/tree-removal 

πŸ‘‰ Stump Grinding: https://www.treesolve.ca/services/stump-grinding 

πŸ‘‰ Pruning: https://www.treesolve.ca/services/pruning 

πŸ‘‰ Tree Cabling: https://www.treesolve.ca/services/tree-cabling 

πŸ‘‰ EAB Injections: https://www.treesolve.ca/services/emerald-ash-borer-injections

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