Weed Barrier
Also known as: landscape fabric, weed cloth, geotextile
A weed barrier is a permeable fabric laid on soil before rock or mulch to block weeds while letting water and air through. It separates the soil from decorative material and reduces weed growth.
In simple terms
Weed barrier is the fabric you roll out under rock or bark. It lets water soak through but blocks sunlight from weed seeds below, so far fewer weeds come up through your beds.
In depth
Quality weed barrier is a woven or spun-bonded geotextile that is permeable yet light-blocking and puncture-resistant. Under rock it does double duty: weed suppression plus separation, keeping stone from sinking into soil. Limitations matter — over time, windblown soil and organic debris settle on top of the fabric and weeds root in that layer, so fabric works best under rock (which stays clean) and less well under organic mulch (which becomes a seedbed as it breaks down). Overlap seams, pin securely, and pair with clean edging.
Why it matters
Under rock and gravel, a good weed barrier dramatically cuts maintenance and keeps stone from disappearing into the soil — the difference between a clean rock bed and a weedy, sunken one.
Common mistakes
- Using cheap thin plastic instead of permeable fabric, which traps water and suffocates soil.
- Relying on fabric under organic mulch, where decomposed mulch on top becomes a weed seedbed anyway.
Examples & uses
- Under decorative rock and gravel beds.
- Beneath pathways and dry creek beds.
- Separation layer under artificial turf base.