Cloth weed barrier beats plastic for most gardens because it lets water and air reach plant roots while still blocking weeds.
Standing in the aisle staring at rolls of black plastic and woven fabric, most homeowners pick wrong. The choice between plastic weed barrier vs cloth weed barrier comes down to one question: what are you planting? The answer changes how your beds perform for years.
Plastic sheeting blocks everything—light, water, and air. That makes it powerful against weeds but brutal on soil. Cloth lets moisture and oxygen through while stopping sunlight.
How Each Barrier Actually Works
Plastic weed barrier is a solid, impermeable polyethylene sheet. It smothers existing weeds and blocks roots but starves the soil of oxygen and traps moisture, causing root disease. Cloth weed barrier—also called landscape fabric or geotextile—is a woven or nonwoven polypropylene or polyester. Its structure blocks sunlight while allowing water, air, and nutrients to reach the soil, though weeds can germinate in mulch that accumulates on top over time.
Plastic vs Cloth: Where Each One Belongs
Plastic sheeting wins in specific situations: temporary suppression before planting, row crops where soil warming and moisture retention help production, and areas where you never need water or air to pass through, like gravel paths or storage areas.
Cloth is the better choice for anything you intend to keep alive. Trees, shrubs, and mixed landscape beds need water and oxygen at their roots. On slopes, fabric also helps with erosion control and moisture retention. Portland.gov’s landscaping guidance is direct: geotextile fabrics are preferred over plastic for landscapes because air and water move through them.
| Situation | Better Choice | Reason |
|---|---|---|
| Vegetable row crops | Plastic | Warms soil, holds moisture |
| Around trees and shrubs | Cloth | Lets water and air reach roots |
| Temporary weed suppression | Plastic | Stops everything fast |
| Mixed flower and perennial beds | Cloth | Irrigation penetrates, roots stay healthy |
| Gravel paths and patios | Plastic | No plants need water beneath |
| Sloped landscape beds | Cloth | Erosion control plus moisture retention |
| Long-term permanent beds | Cloth | Less disruption to soil health over time |
Installation Mistakes That Ruin Either Barrier
Both materials fail when installed carelessly. The most common error is laying barrier over existing weeds—they persist underneath and push back up through cuts. Remove every weed first. Cutting too many holes for plants creates entry points; keep them as small as the root ball demands.
Fabric must be secured with landscape staples or pins. Unsecured cloth gets pushed up by perennial weeds. Plastic in poorly drained areas traps moisture and suffocates roots—check drainage before committing.
One honest reality: fabric is often a short-term solution. University of Illinois Extension and Piedmont Master Gardeners note that landscape fabric clogs with soil and mulch over time, losing permeability, and weeds root into the mulch layer on top. Plan on replacing it after a few seasons.
If plastic fits your project, our tested roundup of the best plastic weed barriers covers the options that hold up.
Disposal and Long-Term Thinking
Both materials create disposal waste when removed, and neither breaks down in compost. Plastic sheeting is especially difficult to remove once weeds root through it or soil compacts on top. Fabric also frustrates gardeners who rearrange plantings frequently—installed sheets are hard to modify, and cutting new holes damages integrity.
The bottom line: cloth for anything living, plastic for everything else.
FAQs
Does landscape fabric really stop weeds for good?
No. Landscape fabric suppresses weeds effectively at first, but it clogs with soil and mulch over time, reducing water penetration. Weeds also germinate in the mulch layer that accumulates on top. Most sources describe fabric as a multi-year solution, not permanent.
Will plastic sheeting kill my shrubs and trees?
Plastic can harm woody plants by blocking water and oxygen exchange at roots. Rain cannot penetrate, and trapped moisture may cause root disease. For trees and shrubs, cloth fabric is safer because it allows moisture and air to reach the root zone.
Can I put mulch on top of plastic weed barrier?
You can, but it rarely works well. Mulch slides off, and weeds germinate in the moist mulch layer itself. The mulch never breaks down into soil because plastic blocks decomposition. Fabric under mulch works better, though weeds may still root in mulch over time.
References & Sources
- University of Illinois Extension. “Disadvantages of Landscape Fabric.” Details how fabric clogs and loses effectiveness over time.
- Piedmont Master Gardeners. “Landscape Fabric for Garden Bed Weed Control: Good or Bad Choice?” Explains fabric permeability and long-term soil health considerations.
- City of Portland. “Landscape Fabric and Plastic Sheeting Guidance.” Recommends geotextile fabrics over plastic for landscape use.