How thick should I lay mulch?

The ideal depth for most landscape beds is 2 to 4 inches. Less than 2 inches won't effectively stop weeds or retain moisture, while more than 4 inches can suffocate plant roots and create a habitat for pests.

Is bulk mulch cheaper than bagged?

Generally, yes. Bulk mulch purchased by the cubic yard is often 30-50% cheaper than buying the equivalent amount in bags. However, many suppliers have a delivery fee, so for small projects (under 2-3 yards), bags might be more economical.

What is 'volcano mulching' and why is it bad?

Volcano mulching is piling mulch high against the trunk of a tree. This traps moisture against the bark, leading to rot, disease, and insect infestation. Always keep mulch 3-4 inches away from the tree trunk.

How many bags are in a cubic yard?

One cubic yard equals 27 cubic feet. If you are buying 2-cubic-foot bags, you need 13.5 bags to make a yard. For 3-cubic-foot bags, you need 9 bags.

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Mulch Calculator

Calculate mulch, bark, or wood chips needed for your garden.

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Bed Length (feet)

Bed Width (feet)

Mulch Depth (inches) Recommended: 2-4 inches

Price per Cubic Yard ($)

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Est. Bulk Cost: $0.00

Reviewed by Sarah Jenkins, Landscape Designer | Last Updated: November 2025

Why Mulch Matters

Mulch is more than just decoration. It suppresses weeds, retains soil moisture, regulates soil temperature, and adds organic matter as it breaks down. Calculating the right amount ensures your plants get these benefits without wasting money on excess material.

💡 Expert Tip: Avoid "Volcano Mulching"

"Never pile mulch high against the trunk of a tree or shrub. This practice, known as 'volcano mulching,' traps moisture against the bark and encourages rot, disease, and rodent damage. Always leave a 3-inch gap between the mulch and the plant's base."

Common Mistakes to Avoid

Too Thin: A layer less than 2 inches allows sunlight to reach weed seeds and doesn't hold moisture effectively.
Too Thick: More than 4 inches can suffocate plant roots by reducing oxygen exchange and can create a water-repellent mat (especially with hardwood mulch).
Ignoring Drainage: Don't mulch over drains or low spots where water needs to flow freely.

Frequently Asked Questions

Dyed vs. Natural Mulch?

Dyed mulch (black, red, brown) holds its color longer (often a year or more) but breaks down slower. Natural mulch (shredded hardwood, pine bark) improves soil quality faster but fades to gray within a season.

When is the best time to mulch?

Spring is ideal to suppress new weeds and retain moisture before summer heat. Fall mulching helps insulate roots against winter freeze-thaw cycles.

Does mulch attract termites?

Termites can be attracted to wood mulch, but they rarely nest in it. To be safe, keep mulch at least 6-12 inches away from your home's foundation or siding.