How to Mulch Your Minnesota Garden

A Guide to Mulching in Minnesota

It’s that time of year again. The ice is melting, the birds are chirping, and those first rays of warm sunshine are peeking through the clouds. Springtime is here, and homeowners are eager to get their yards in top shape for summer. Some spring chores, such as raking and weeding, can be completed as soon as the snow melts. Others, like mulching, should wait until mid- to late-spring.

Why is Mulch Important?

A freshly mulched yard is sure to give your yard a clean, well-kept aesthetic. However, many landscape designers favor this product for more than the visual component. When installed correctly, mulch protects your gardens from pesky weeds, helps the soil retain moisture, and prevents soil erosion. But before you run out to your local gardening store, it's important to note that with mulch, timing matters.

When is the Best Time to Mulch in Minnesota?

In Minnesota, mulching season typically begins in mid-to-late spring. It should be completed once the ground has fully thawed and the soil has started to warm. Mulching too early could delay the thawing process, affect the soil, and cause preventable issues within the garden.

How thick should mulch be applied around plants?

Did you know there is a science to effectively applying mulch? Applying too thin a layer will allow weeds to rise to the surface. On the other hand, too much may prevent water from reaching the soil. Landscape designers usually suggest a layer 2-3 inches deep. Don't know how many bags to buy? Check out this handy mulch calculator.

Mulching Tips

• Depth matters: Apply mulch 2–3 inches deep (no more) for most plants.
• Keep away from trunks: Leave a 6-inch "mulch-free doughnut" around trunks and stems to prevent rot.
• Winter protection: In late fall, use straw or leaf mulch to protect perennials.
• Windy areas: Choose shredded hardwood — it stays put better than nuggets or straw.
• Heavy rains: Avoid using pine bark nuggets — they float and can be washed away.
• Urban gardens: Aged wood chips are often available through municipal tree programs.

What is the best mulch for Minnesota Gardens?

Mulching typically comes down to personal preference. However, depending on your landscape, some types of mulch may be more suitable than others. Organic mulch includes shaved hardwood chips, pine needles, bark, or any other kind of natural material. Landscape designers often recommend organic mulch because it breaks down, adding organic matter back into the soil. Landscape rock is also a popular choice because it requires less maintenance and does not need to be replenished frequently.