One of the most common mistakes homeowners make is creating “mulch volcanoes” — piling mulch high against the trunk of the tree. While it may look neat and tidy at first, this practice can seriously damage or even kill a tree over time.

Here’s how to properly plant a tree and mulch it the right way for long-term success.

Step 1: Choose the Right Tree for the Right Place

Before digging, think carefully about mature size, sunlight needs, drainage, and proximity to structures or utilities.

A small sapling may someday become a massive shade tree with roots extending far beyond the canopy. Think about the location of your house, walkways, power and utility lines. Choosing the correct species for your site helps prevent future problems and reduces maintenance.

Native and climate-adapted trees are often the best choice because they have adapted to local conditions while also benefitting the local wildlife.

Step 2: Dig a Wide, Shallow Hole

A common mistake is digging the planting hole too deep.

The ideal hole should be:

A: Two to three times wider than the root ball

B: Only as deep as the root ball itself

Trees planted too deeply often develop poor root systems and struggle with oxygen availability.

The top of the root flare — where the trunk begins to widen at the base — should sit slightly above the surrounding soil grade.

Step 3: Locate the Root Flare

The root flare is one of the most important parts of proper tree planting.

Unfortunately, many nursery trees are buried too deeply in their containers. Before planting, gently remove excess soil from the top of the root ball until the root flare becomes visible.

Planting with the root flare exposed helps prevent:

• Rot
• Girdling roots
• Fungal disease
• Poor oxygen exchange

A properly planted tree should visibly widen at the base rather than resemble a telephone pole disappearing straight into the ground.

Step 4: Backfill with Native Soil

When filling the hole back in, use the original soil you removed rather than heavily amending it with compost or bagged soil.

Why? Because roots need encouragement to grow outward into the surrounding native soil. Overly rich planting pockets can discourage root expansion and create drainage issues.

Gently tamp the soil to remove major air pockets, but avoid excessive compaction.

Step 5: Water Thoroughly

New trees need consistent moisture while establishing roots.

After planting:

• Water deeply immediately after installation
• Continue watering regularly during the first one to two growing seasons
• Adjust frequency depending on rainfall and temperature

Deep, infrequent watering encourages stronger root growth than shallow daily watering.

Step 6: Mulch Correctly — Not Too Much

Mulch is beneficial when used properly. It helps:

• Retain soil moisture
• Moderate soil temperature
• Reduce weeds
• Prevent mower and trimmer damage

Too much mulch can become a serious problem, leading to the dreaded mulch volcano.

What Is a Mulch Volcano?

A mulch volcano occurs when mulch is piled high against the trunk of a tree, forming a cone or mound shape.

Although common in commercial landscaping, mulch volcanoes are harmful because they:

• Trap excessive moisture against the bark
• Encourage rot and fungal disease
• Attract insects and rodents
• Promote girdling roots
• Reduce oxygen around the root flare

Over time, this stress slowly weakens and in severe cases kills an otherwise healthy tree.

The Correct Way to Mulch a Tree

Instead of piling mulch towards the center, apply it in a flat, donut-shaped ring around the tree.

Follow these guidelines:

• Keep mulch 2–4 inches deep
• Pull mulch several inches away from the trunk
• Extend the mulch ring outward as far as practical

Think “donut,” not “volcano.”

The trunk should remain dry and visible at all times.

Avoid These Common Tree Planting Mistakes

Even healthy trees can fail if these planting principles are ignored:

1. Planting too deep

2. Over-mulching

3. Staking too long

4. Improper watering

A Healthy Start Means a Healthier Tree

Trees are long-term investments that can thrive for generations when planted correctly. Proper depth, adequate watering, and responsible mulching practices all play a critical role in establishing strong roots and long-term health.

And when it comes to mulch, less is often more.

By avoiding mulch volcanoes and giving your tree proper care from the beginning, you’ll set the foundation for decades of healthy growth, beauty, and environmental benefits.