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Mulch and Topsoil questions, answered by experts

In most cases, it’s better to remove rocks before adding mulch. Layering the two will restrict drainage and plant health, and can create an unpleasant texture underfoot.

If you’re mulching in the fall, aim to lay down the material right after the first frost, which will vary by climate. Late October and early November are good time ranges to aim for. Try to lay down your mulch after a light rainfall to lock in moisture for root growth through the winter.

You should add 1 to 4 inches of mulch, depending on your garden type and needs. Keep in mind that no amount of mulch can completely prevent weeds, but a heavier coverage (closer to 4 inches) can suppress weeds enough that you are only seeing them sprout every few weeks. Finer mulch prevents weeds more effectively than large mulch, so if you’re using mulched leaves or shredded bark, 1 to 2 inches will likely suffice, while 3 to 4 inches is best for larger mulch, like bark chips or straw.

Since the nature of the landscaping project can heavily influence the overall cost, it helps to understand what different types of landscaping projects cost on average. For example:

  • Plant a tree: $100–$2,000

  • Build a retaining wall: $3,250–$9,200

  • Reseed a lawn: $450–$1,700

  • Install a water fountain: $950–$4,800

  • Install a paver patio: $2,400–$7,000

  • Install a concrete walkway: $1,200–$2,400

  • Install a flower bed: $800–$3,000

  • Landscape lighting: $2,000–$6,000

A light layer of mulch can help protect a tree, retain moisture, and keep the soil healthy. However, it’s important to avoid over-mulching or piling the mulch up around the trunk of a tree, a practice notoriously called “volcano mulching.” That piled mulch can increase the chances of rot and disease on the tree trunk as well as overwhelming the soil, which needs access to a certain amount of air. Topped trees have it hard enough: mulch sparingly while they heal.

The Chehalis, WA homeowners’ guide to mulch and topsoil services

From average costs to expert advice, get all the answers you need to get your job done.