Many homeowners and DIYers turn to landscape fabric when installing gravel, hoping to suppress weeds and create a tidy, low-maintenance surface. But is it actually effective in the long run? In this article, we examine what scientific research and practical experience say about using landscape fabric under gravel, and how thoughtful gravel selection and installation can often offer better, longer-lasting results.
What Landscape Fabric Is Designed to Do
Landscape fabric, also called weed barrier, is typically made from woven or non-woven polypropylene or polyester. It is meant to:
- Block sunlight and reduce weed growth
- Allow air and water to move through the soil
- Separate soil from gravel or mulch layers
It is commonly used under mulch, stone, or gravel in garden beds, walkways, and patios. While not all fabrics perform equally, most made of polypropylene or polyester will release microplastics over time as they degrade.
What Research Says About Landscape Fabric
According to Washington State University horticulturist Dr. Linda Chalker-Scott, landscape fabric is often misunderstood. It can be effective at reducing weeds short-term, but tends to lose effectiveness over time as organic matter builds up on top and weeds root into that layer (WSU PDF).
The University of Illinois Extension notes similar findings: new weed seeds blow in and take root above the fabric, making long-term suppression unreliable. Additionally, over time, soil particles can clog the pores of the fabric, restricting water and air exchange and potentially harming soil health (Illinois Extension).
Michigan State University trials found that even with full gravel or mulch coverage, weeds often emerge through seams or planting holes in the fabric within just a few years (MSU Turfgrass Info Center).
The Importance of Fabric Quality & Application
Not all landscape fabric is created equal, and its performance depends on both material type and how it’s used. Woven fabrics are typically stronger and more suitable for use under gravel, while non-woven or biodegradable options are better for mulched garden beds. Thicker materials may offer durability and better soil separation, but if too dense, they can restrict water movement. Conversely, lightweight or highly porous fabrics may drain well but degrade faster or fail to stop weed growth. Regardless of the type, proper installation, including overlap, anchoring, and full coverage, is essential. Still, even the best fabric can’t compensate for issues like poor drainage, minimal gravel depth, or lack of compaction in the base layer.
What About DIY Alternatives?
Some homeowners try using cardboard, newspaper, or even old carpet as weed barriers. These can temporarily block sunlight and reduce weed growth, but they come with significant drawbacks:
- Cardboard and newspaper break down quickly and can shift. While they are biodegradable and permeable, using too many layers or materials with tape or coatings can reduce permeability and restrict water movement into the soil.
- Carpet and plastic sheeting trap moisture and impede drainage. Similar to synthetic landscape fabrics, they can also contribute to root rot or fungal issues in nearby plants by limiting oxygen and trapping excess moisture in the soil.
An Alternative Approach: Let the Aggregate Do the Work
Instead of relying solely on landscape fabric, many professionals recommend proper base preparation and material selection. At Serbu Sand & Gravel, we supply the aggregates needed to create a stable, weed-resistant surface that performs well over time.
Start with Crushed Rock or Road Base
Using 3 to 6 inches of well-compacted three-quarter inch crushed rock or road base creates a solid foundation that blocks light and limits weed germination. This also helps prevent gravel from sinking into the soil.
Add a Top Layer of Crusher Dust or Gravel
Finishing with a layer of crusher dust or decorative gravel fills gaps and adds density. This compacts well and further limits weed growth by denying light and space for seeds.
Maintain the Surface Over Time
Even with or without fabric, gravel surfaces benefit from regular maintenance. Topping up gravel periodically helps preserve depth and prevent weed intrusion.
When Landscape Fabric Might Still Make Sense
There are situations where landscape fabric remains a reasonable choice:
- Under decorative gravel in low-traffic garden beds
- In areas where soil separation is critical
- Where excavation is limited or fabric is being layered over an existing surface
In these cases, combining fabric with the right aggregate base can offer temporary or cosmetic weed control.
Final Thoughts
Scientific research shows that landscape fabric can be helpful in the short term but is not a permanent weed solution. Many long-term problems stem not from a lack of fabric, but from poor mulch choices, thin layers, and lack of compaction.
Whether you choose to use landscape fabric or not, high-quality gravel and proper base materials remain essential. Serbu Sand & Gravel supplies a full range of aggregates to help homeowners and contractors in Regina and surrounding areas build durable, low-maintenance surfaces that last.
