Proper Tree Mulching: A Guide for Homeowners

Based on the International Society of Arboriculture's Best Management Practices

Benefits of Mulching

• Reduces weeds and competition for water

• Improves soil moisture and quality

• Protects tree trunks from mower damage

• Regulates soil temperature

• Adds organic matter as it breaks down

Steps to Create a Mulch Ring

1. Remove Grass and Excess Soil

• Carefully dig a wide ring (2–3 feet from the trunk for small trees, larger for mature trees).

• Use hand tools and avoid damaging the bark or exposed surface roots.

• Locate the root flare (where the trunk flares at the base). This should remain visible, and in some cases may need to be exposed manually.

Tip: Never allow tools to scrape or cut the bark or roots.

2. Add 2–4 Inches of Organic Mulch

• Use natural mulch like shredded bark, wood chips, or composted leaves.

• Spread the mulch evenly over the cleared area.

3. Taper the Mulch Down

• Ensure mulch depth tapers down as it approaches the trunk.

• This prevents moisture buildup around the base and encourages proper air circulation.

4. Keep Mulch Away from the Trunk

• Leave a 2–3 inch gap between the mulch and the trunk.

• Avoid creating a “mulch volcano” (a cone-shaped pile touching the trunk).

Important: Mulch against the trunk can cause rot, pest problems, and disease.

Maintenance Tips

• Replenish mulch as needed to maintain the proper depth.

• Check that the mulch is not compacted and continues to stay loose and breathable.

• Periodically inspect the root flare to ensure it’s not getting buried over time.

Key Takeaways

✅ Mulch helps trees thrive by improving soil and protecting roots
✅ Be gentle and never damage bark or roots during turf removal
✅ Use 2–4 inches of organic mulch, not touching the trunk
✅ Maintain and refresh mulch regularly

For more info, visit:
🌳 TreesAreGood.org
🧑‍🌾 Consult a local ISA Certified Arborist