For garden beds with mulch, landscape fabric waste is what the research points to. Fabric under organic mulch loses its power to block weeds within a few years. It then creates more problems than it fixes. For gravel and stone projects, it still makes sense because it holds up for decades.
I spent about $85 on fabric, staples, and tools to cover three beds five years ago. The install took a full weekend of my time. When I pulled that same fabric out last spring, the removal took even longer. Roots had grown through every inch of it. I figure the labor for removal was worth more than double what I paid for the stuff. That money would have bought enough wood chip mulch to cover those beds for three full seasons with zero hassle at the end.
Here is why fabric turns into a waste of your time and cash. You lay it down and cover it with mulch to look nice. Over the next year or two, that mulch breaks down into a thin layer of rich compost right on top of the fabric. Weed seeds blow in and land on that layer. They sprout with ease since they have soil, water, and light. Landscape fabric effectiveness drops to near zero once this compost forms. Your weeds now grow above the fabric, not below it.
NC State Extension has studied this since the 1980s. They found that fabric with organic mulch on top gets just as weedy as bare ground within a few seasons. Penn State Extension tracked a home case where pulling out old fabric took 2 workers a full 2 days. The soil underneath had turned into a clay-like mass that needed heavy fixing before it could support plants again.
So is landscape fabric worth it for your project? Ask yourself one thing. Will you cover it with stone, gravel, or rubber mulch that won't break down? Then yes, go ahead. Will you top it with wood chips, bark, or shredded leaves? Then no. You'll spend money now and spend even more on removal later. The math never works out in your favor when you pair fabric with organic mulch.
Take whatever you planned to spend on fabric and buy 3 to 4 inches of quality organic mulch instead. Mulch blocks weeds just as well for the first few years. It also feeds your soil instead of starving it. When it breaks down, you add more on top. No removal, no trapped roots, no dead ground underneath. Your plants will grow better and your beds will stay healthier for years to come. You'll never have to spend a weekend on your knees ripping out rotted fabric from a tangled mess of roots.
Read the full article: Landscape Fabric: Pros, Cons, and Uses
