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Why Mulching Matters for Your Garden
Mulch is more than just decoration—applying a layer of material to the
soil surface helps your garden thrive. According to the University of
Minnesota Extension, mulch retains soil moisture, suppresses weeds,
moderates soil temperature, and builds organic matter in the soil.
These benefits mean less watering, fewer weeds to pull and a more
stable environment for roots. Research shows that mulch reduces
evaporation from the soil surface and improves soil structure and
biological activity over time. By making
mulching part of your routine, you improve plant health while
reducing maintenance.
How Deep Should Your Mulch Be?
Proper application is key to getting the most out of mulch. Experts
recommend removing weeds before mulching and applying mulch at a
depth of about 2–4 inches. A thin layer
won’t suppress weeds or conserve moisture, but piling mulch too deep
can suffocate roots and trap excess moisture. Iowa State University
notes that coarse materials like wood chips belong at the high end
of this range and fine materials like grass clippings at the low
end. Never build a mulch “volcano” around
tree trunks; stacking more than 2–4 inches against stems keeps
bark wet and can promote disease and insect problems.
Always feather mulch away from trunks and monitor the depth over
time to keep your plants healthy.
Choosing the Right Mulch Material
Not all mulches are created equal. Organic options—such as wood chips,
shredded bark, straw, compost, and grass clippings—add nutrients and
improve soil structure as they break down.
Wood chips or shredded bark last a long time and are ideal around
trees, shrubs and perennials; straw is
excellent for vegetable gardens and helps keep produce clean.
Compost feeds plants but doesn’t suppress weeds as well,
while grass clippings decompose quickly and should be applied in thin
layers. Inorganic materials like gravel or
stone work well for paths or areas where plants aren’t desired but
don’t improve soil. Consider the needs of
your plants, the look you want and how often you’re willing to
replenish the material when selecting a mulch for your landscape.
Ready to estimate your mulch needs? Try our
Mulch Bag Calculator for an instant calculation.
Not sure about the right depth? Check out our
Mulch Depth Guide.