Why your garden's health depends on what you spread over the soil

Society · Published 7 October 2026 Swipe more like this →

In short: Mulch is often viewed as a simple aesthetic finishing touch, but its true value lies in soil preservation. From preventing erosion during heavy rainstorms to deterring pests with natural oils, the right organic layer can transform your garden's ecosystem. However, choosing the wrong material can actually harm your plants.

To maximize garden health, landscape contractor Jenn Nawada suggests using organic materials like shredded bark, wood chips, pine straw, leaf mulch, hay, or cocoa shells. These organic options benefit the soil through decomposition and by introducing earthworms. For example, applying hay at the end of the year can help retain nutrients by preventing them from washing out. To achieve optimal outcomes, spread 1–2 inches of mulch over perennials and 2–3 inches for shrubs, preferably during spring for woody plants.

However, application technique is critical to avoid plant damage. One common mistake is creating 'mulch volcanoes,' which can invite rot by trapping too much moisture. It is essential to move mulch away from the base of stems and tree trunks to ensure the root flare remains exposed. While organic mulch improves soil, inorganic alternatives like stones and pebbles present different risks; they retain solar heat for longer periods, which can dry out the soil and potentially burn plant roots.

Not all mulches are created equal. While organic options require annual replacement, they contribute to the soil's vitality. In contrast, synthetic materials like rubber or plastic mulch do not contribute to soil health and may contain harsh chemicals. Even dyed wood chips can be problematic, as they may leach chemicals into the surrounding soil. Choosing between organic and inorganic materials requires balancing the desire for a finished look with the long-term biological needs of the garden.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?

Related

• The art of mulching: how to protect your soil without harming your trees
• Why a simple layer of mulch is the ultimate secret to a thriving garden
• Why mulching is the easiest way to build healthy soil without breaking a sweat
• Why a simple layer of mulch can slash your watering needs by 70%
• Why mulch is the most versatile tool for a healthier, more productive garden
• The German Alp: A Supernatural Nightmare That Once Explained Sleep Paralysis
• Alfredo Stroessner ruled Paraguay for 35 years under a near-permanent state of siege
• The rhythmic secret behind heavy metal's rapid-fire guitar precision
• How a young king ended decades of Spanish instability before dying at twenty-seven.
• Breaking the cycle of hopelessness in America's forgotten places
• Russia's Most Quiet tsar reigned through riots, rebellion and a church split
• Can bipartisan cooperation revive American politics and solve climate change?

More in Society · Latest · A–Z · All topics