05/03/2026
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The Mulch You Choose Is Changing Your Soil Underground 🪵
All mulch looks similar from above. Below the surface, the differences are dramatic — and the wrong choice can damage your soil biology for years.
Here is what each common mulch type actually does underground:
🪵 Wood chips — The best all-around mulch for permanent beds. As it breaks down slowly, it feeds the fungal networks in your soil that plants depend on for nutrient uptake. Apply 3–4 inches deep around trees, shrubs, and perennial beds.
🌾 Straw — Clean, lightweight, and excellent for vegetable gardens. It decomposes quickly and adds organic matter without the heavy wood-chip carbon load that can temporarily lock up nitrogen.
🍂 Shredded leaves — The most underrated mulch in any American yard. Free, available every autumn, and the single best thing you can add to soil health. Run your mower over collected leaves and apply immediately.
⬛ Black plastic sheeting — Marketed as a w**d suppressor and it does work, but it prevents rainfall from reaching roots, heats soil to damaging temperatures in summer, and kills the beneficial soil organisms that make your garden productive. Avoid using it in any living garden bed.
🪨 Gravel and stone — Appropriate for pathways and drainage areas, not for plant health. It reflects heat upward onto plant stems, provides zero nutritional value to the soil, and creates a permanently inhospitable environment for soil life.
