Mulching Around Trees: No Mulch Volcanoes

title: "Mulching Around Trees: No Mulch Volcanoes"

Walk through any residential neighborhood in summer and you'll see them: trees with mulch piled 6, 8, even 12 inches deep against the trunk, creating a cone shape. The nursery industry calls this a "mulch volcano." It's the most common tree care mistake in America, and it kills trees.

The problem is slow enough that most homeowners don't connect the cause to the effect. A tree mulched incorrectly in 2010 may not show visible decline until 2018. By then the root damage, bark rot, and girdling roots initiated by the mulch have progressed beyond the point of reversal.

This guide covers how mulch actually benefits trees when applied correctly — and how to avoid the practices that harm them.

Table of Contents

1. Why Mulch Matters
2. The Mulch Volcano Problem
3. How to Mulch a Tree Correctly
4. Mulch Depth and Volume
5. Mulch Materials Comparison
6. Re-mulching Schedule
7. Frequently Asked Questions

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