Mulch is one of the most beneficial tools in your landscaping toolbox—but only when it’s used correctly. While mulching is widely recommended for protecting plants, retaining moisture, and improving soil health, common misconceptions can actually cause more harm than good. Let’s break down some of the most common mulch myths and explain what truly helps your plants thrive year-round.
Myth #1: More Mulch Is Always Better
The Truth: Too much mulch can be harmful.
A thick layer of mulch may seem like extra protection, but piling it too high—especially against tree trunks—can lead to serious issues. Excessive mulch restricts airflow, traps moisture against bark, and creates the perfect environment for pests and disease. Over time, this can cause rot and even girdle the tree.
Best Practice: Apply mulch 2–3 inches deep and always keep it pulled back from the trunk. Think “donut,” not “volcano.”
Myth #2: Mulch Should Touch the Tree Trunk
The Truth: Mulch should never be piled directly against trunks or stems.
When mulch touches the trunk, it holds moisture where bark needs to stay dry. This encourages fungal disease and decay and can weaken the plant over time.
Best Practice: Leave a gap about the width of a tire between the trunk and mulch. This “moat” helps prevent disease and protects the root flare.
Myth #3: Mulching Means You Can Skip Watering
The Truth: Mulch helps retain moisture—but it doesn’t replace watering.
Mulch slows evaporation, but plants still need water, especially during winter dry spells. This is particularly important for evergreens and newly planted trees and shrubs, which are more vulnerable to dehydration during colder months.
Best Practice: Continue watering during extended dry periods, even in winter, when temperatures are above freezing.
Myth #4: Any Organic Material Makes Good Mulch
The Truth: Not all organic materials are created equal.
While shredded leaves can make excellent mulch, large unshredded piles can mat together and prevent water from reaching the soil. Similarly, using unfinished compost or grass clippings incorrectly can introduce problems like odor, mold, or nitrogen imbalance.
Best Practice: Use shredded leaves, aged wood mulch, or composted materials that allow air and water to move freely.
Myth #5: Mulch Is Only for Summer
The Truth: Mulch is just as important—if not more so—in winter.
Winter mulching helps keep soil temperatures stable, prevents freeze-thaw cycles from damaging roots, and keeps plants in dormancy during unpredictable weather. It also protects against erosion and nutrient loss.
Best Practice: Refresh mulch in late fall or early winter to prepare plants for cold conditions.
Myth #6: Mulch Prevents All Weeds Forever
The Truth: Mulch helps suppress weeds, but it’s not permanent.
Over time, mulch breaks down and weeds can still find their way through, especially if the layer becomes thin or compacted.
Best Practice: Maintain proper depth and refresh mulch as needed to keep weed pressure low.
The Bottom Line
Mulch is one of the best investments you can make in your landscape—when applied properly. Avoid common mistakes like piling mulch against trunks or skipping winter watering, and you’ll set your plants up for healthier growth and fewer problems come spring.
If you’re unsure whether your beds are mulched correctly or want help preparing your landscape for winter, reach out to our team. We’re happy to help you protect your investment and keep your property looking its best year-round.