Mulching trees might seem like a simple task, but doing it incorrectly can actually harm your trees more than help them. When done the right way, mulch acts as a powerful ally for healthy tree growth. It retains moisture, regulates soil temperature, and suppresses weeds. However, a common mistake—like piling mulch too high—can invite pests, disease, and root rot.
In this article, we’ll walk you through the right way to mulch trees and explain why it matters for both young and mature trees. Whether you’re a homeowner or a contractor in New Jersey, this guide will give you practical, landscape-friendly tips you can trust.
Why Mulching Trees Is Important
Let’s start with why mulch matters:
- Moisture Retention: Mulch keeps the soil damp for longer, reducing the frequency of watering.
- Weed Suppression: A good mulch layer helps prevent weeds from sprouting around the tree base.
- Soil Temperature Regulation: It keeps the soil cooler in the summer and warmer in the winter.
- Protection From Lawn Equipment: Mulch forms a buffer zone that keeps mowers and trimmers from damaging the trunk.
- Enhanced Soil Structure: As organic mulch breaks down, it improves the overall quality of the soil.
Best Types of Mulch for Trees
Not all mulch is created equal. Some types are better suited for trees than others.
Organic Mulch (Best for Long-Term Health)
- Hardwood Bark Mulch: Long-lasting, slow to decompose. Ideal for trees.
- Shredded Wood or Bark: Easily available, and breaks down over time to improve soil.
- Composted Leaves: Excellent for enriching the soil, though it decomposes quickly.
Inorganic Mulch (Used Sparingly)
- Stone or Gravel: Not recommended around tree trunks, as it doesn’t enrich the soil and can retain heat.
- Rubber Mulch: Offers weed suppression but provides no nutrients and may leach harmful chemicals.
If you’re in New Jersey, you can pick up top-quality mulch at Kirk Allen Landscape Supply or call 973-347-3117 for local delivery in bulk.
Step-by-Step: How to Mulch a Tree Correctly
Here’s how to mulch your tree the right way, whether it’s newly planted or a decades-old oak.
1. Clear the Area
Remove grass, weeds, and any existing old mulch around the base of the tree. You want a clean ring with at least a 3-foot diameter for younger trees and up to 6 feet for larger ones.
2. Choose the Right Mulch Depth
Apply mulch in a layer that’s about 2 to 4 inches thick. Too little won’t do much; too much could suffocate the roots or attract pests.
3. Keep Mulch Away From the Trunk
This is the golden rule. Never pile mulch against the tree trunk. This common error, called “volcano mulching,” can lead to rot, disease, and insect infestations. Leave a 2-3 inch gap between the mulch and the trunk flare.
4. Shape It Like a Donut, Not a Volcano
Visualize a donut: the tree trunk is the hole, and the mulch is the ring around it. This design encourages proper air flow and prevents moisture buildup at the bark.
5. Maintain the Mulch
Replenish mulch as it decomposes—usually once a year in early spring or late fall. Remove any built-up, compacted mulch from previous years before adding more.
Mulching Tips for Different Tree Stages
For Young Trees
- Use lighter mulch like shredded wood or composted leaves to avoid compacting young roots.
- Be extra cautious with depth and trunk contact.
For Mature Trees
- You can apply mulch out as far as the canopy (drip line) to provide widespread soil benefits.
- Use hardwood mulch for long-term durability and less maintenance.
Common Mistakes to Avoid
Even seasoned gardeners and landscapers sometimes slip up. Here are the mistakes to avoid:
- Volcano mulching: Again, it bears repeating—keep mulch away from the trunk.
- Over-mulching: More mulch isn’t better. You’ll end up with waterlogged roots and poor air circulation.
- Using the wrong materials: Avoid dyed or treated wood chips from unknown sources, which may contain chemicals.
- Ignoring mulch maintenance: Old, compacted mulch won’t do its job. Keep it fresh.
Why Contractors and Homeowners in NJ Trust Kirk Allen Landscape Supply
For over 20 years, Kirk Allen Landscape Supply has been the go-to source for high-quality mulch, topsoil, gravel, and stone in New Jersey. We work with both homeowners and professional landscapers, offering:
- Bulk mulch delivery throughout northern NJ
- Competitive pricing on natural and dyed mulch
- Knowledgeable staff who know which products are best for trees, shrubs, and gardens
Call 973-347-3117 to place your order or speak with one of our team members for recommendations.
Final Thoughts
Mulching trees is one of the easiest ways to ensure they thrive for years to come—but it has to be done correctly. Stick to natural materials, avoid smothering the trunk, and refresh your mulch as needed. When in doubt, reach out to your local experts at Kirk Allen Landscape Supply.
We’re here to help New Jersey property owners keep their landscapes healthy and beautiful—one tree at a time.
