Rethinking Mulch: Why Plants Make Better Ground Cover

My neighbor’s new bed drowned in wood mulch—chips halfway up shrubs, nearly covering perennials. Wood mulch has benefits but also drawbacks. Let’s explore why living plants often outperform trucked-in mulch.

Types of Wood Mulch

Chunky mulch (3–4 in) suppresses weeds, adds organic matter, allows water infiltration. Finely shredded mulch forms impermeable mat, blows away, but suppresses weeds well. Avoid cypress (often unsustainably harvested).

Wood Mulch Benefits

Termites don’t like it. Doesn’t steal nitrogen; encourages microbial life, creating great soil. My old garden had 20 yards of mulch; now I mulch with cut perennial stems—by June, ground is invisible.

Too Much Mulch Harms Plants

Mulch volcanoes (1–2 ft against trunks) cause disease, rot, death. Prefer park-like look: trunks emerging from lawn/meadow. Trees like river birch prefer plants around roots for shade and cooling. Studies show mulch circles boost establishment, but feeder roots eventually extend twice tree height—a huge potential mulch circle.

Wood Mulch Isn’t the Best Design Choice

Mulch maroons plants, makes beds look generic. Default landscaping is boring. If you can’t afford more plants, buy plugs (often ⅓ price of larger pots). Plugs establish and spread fast. More plants = more awesome.

Plants Are the Best Mulch

Let self-sowing perennials self-sow. Create dense, layered garden full of life—shelter and food for insects, birds, frogs, kids. Nature abhors a vacuum; mulch is a lifeless vacuum. In nature, seedlings and small plants are the mulch. When planting new beds, use shorter plants under taller ones for a rich, multi-purpose layer.

Eventually You Won’t Need Mulch

Established plants shade out weeds, conserve moisture. Top-dress with compost in fall—it’s both mulch and fertilizer. Let it soak in over winter.

Plants Beat Mulch in Sunny Areas

Mulch breaks down fast in sun, requiring yearly replenishment—not low maintenance. Wood mulch better than rubber (adds nothing, like pollution) or rock (adds nothing, hard to clean/dig). Nothing mulches like a diverse, layered perennial groundcover.

Share your mulch experiences—expert or not. Mulch is complex, varying by location, soil, climate, drainage. Maybe we can create a database? Happy mulching (or not).