By Mark Wu, Co-founder & Technical Director, Sichuan Zhifang Net Industry Co., Ltd.
When a grower tells us their ground cover "failed", we ask one question before anything else. Did the weeds come up through the fabric, or did they come up at the joins?
The answer decides which mistake was made, and they are two completely different mistakes. Weeds through the middle of a panel mean the material was too light or too degraded to block light. Weeds along the seams mean the fabric was laid wrong, however good the fabric was.
Most ground cover complaints we hear trace back to the second one.
Ground cover works by blocking light. No light means no photosynthesis, and a weed seed under the fabric uses up its stored energy and dies without ever reaching the surface. That is all it is doing — it is a light barrier, not a poison.
Any gap breaks the barrier, and a gap of a few centimetres is enough. Weed seed germinates under the edge, the shoot finds the sliver of light at the join, and from that point the fabric is helping the weed by protecting its roots while the top grows freely.
That is why the overlap at every join and every edge must be a minimum of 10 centimetres, laid flat and held down. In practice this is where installations fail most often:
- Panels butted edge to edge with no overlap, on the assumption that "close enough" will work
- Overlap that was correct on the day but has since opened up because the fabric shrank
That second point is worth dwelling on, because it is invisible on a quotation. Our ground cover is specified with a stated 2% shrinkage rate. If a low-cost fabric shrinks more than that in service, the overlap you installed correctly in month one becomes a gap by month twelve — and the weeds arrive through a seam that looks perfectly laid.
Ask for the shrinkage figure. A supplier who does not know it has not tested it. You can see how our woven range is specified in the weed control ground cover range.
Ground cover is quoted in grams per square metre, and in this product family the weight is a direct proxy for how long it will last.
Our woven ground cloth is produced at 100 and 120 g/m² in HDPE 5000S, in both black and white. That is a specification built for outdoor ground contact, with a stated UV guarantee of 500kly across the range.
A lighter fabric does the same job on the day of installation and a different job a year later. Thin material loses tensile strength as it weathers, and once it weakens it tears — from a boot, a wheelbarrow, a pruned branch, or a spade going through it. Each tear is a hole, each hole is a light path, and each light path is a weed.
This is where recycled material enters the picture, and where the difference in price in this market comes from. One of our customers in Australia bought a low-cost ground cover made from recycled material and watched it go brittle and crumble into the soil inside a single season. He replaced it with woven fabric made from virgin material and it has been in normal service since. The two products were sold as the same thing.
Our range is produced from brand-new imported and domestic raw materials with UV and anti-ageing formulas incorporated, which is the reason we can cite a 500kly guarantee rather than describing the fabric in adjectives.
| Specification | What it means in service |
|---|---|
| 100 g/m² HDPE 5000S | Standard ground management; suitable UV package, 500kly guarantee |
| 120 g/m² HDPE 5000S | Heavier duty; better tear resistance for high-traffic or exposed ground |
| Stated 2% shrinkage | Overlaps stay closed through the season |
| Plain weave, HDPE 5000S | Stable, dimensionally controlled, suited to ground contact |
A common mistake is to treat ground cover and plastic sheeting as interchangeable. They are not, and the difference shows up in the soil.
Solid plastic blocks water as well as light. Rain and irrigation cannot reach the soil under it, roots suffocate in wet conditions with no air exchange, and the ground underneath can sour over a season.
Woven ground cover is permeable. Water passes through the fabric into the soil, air still exchanges, and the ground under the cover stays in better condition than bare soil in some respects — the fabric reduces evaporation from the surface, which helps hold moisture through a dry spell.
For an orchard or a nursery bed that will be under cover for years, this is the deciding property. You want the weed control, not a sealed surface.
You can see the woven construction close up in our garden weed control fabric.
Every join is a risk, and the way to reduce risk is to have fewer of them.
Standard widths in our ground cover run 1, 2, 3, 4 and 5 metres, with other sizes produced to order. Specifying the widest roll that suits the bed means fewer passes, fewer overlaps to get right, and fewer places for weeds to find a way through. On a wide orchard row, going from a 2-metre roll to a 4-metre roll can halve the number of joins in the whole installation.
This is a decision made at the ordering stage, not on site. It is worth ten minutes with a site plan.
Three checks, all fast.
Roll out a section in sunlight and look at the weave. A tight, even, plain weave blocks light uniformly. A loose weave with visible openings is a light path no matter what the weight figure says. This is the check that most reliably exposes material sold as ground cover that is not really ground cover — black PP woven weed mat and low-cost shading fabric are sometimes supplied as equivalents, and they are not.
Pull the edge. A heat-set, cleanly finished edge holds. A frayed edge with loose threads tells you the finishing step was skipped, and the fabric will continue to fray across the panel in service.
Look for the mark. Every roll we ship carries a ZF label inside the packaging. In a market where traders buy plain fabric and re-label it, a mark that the actual factory placed there is the only dependable way to know the material is what the invoice says it is.
The installation rules are short and they decide the outcome more than the material does.
Overlap 10 centimetres minimum at every join and edge, and hold it down so it cannot shift. On slopes, work down the gradient so water runs over the overlaps rather than lifting them. Leave the fabric slightly loose rather than drum-tight, so it does not pull against its fixings when temperatures change. Cut planting holes as small as the stem allows, and keep the fabric clear of the trunk so the collar stays dry.
Do those four things with 120 g/m² woven fabric and a 2% shrinkage rate, and the same ground cover will still be doing its job in year five.
We have been manufacturing functional agricultural materials from Ziyang, Sichuan since 2011, from a workshop of nearly 10,000 m² with more than 50 sets of production equipment and an annual capacity of 20 million square metres. Woven ground cover is produced on our own line from new HDPE 5000S with UV and anti-ageing formulas, which is why we can state a weight, a shrinkage rate and a 500kly guarantee rather than a description.
Send us the site type — orchard, nursery bed, greenhouse floor or landscape project — the total area, and how long you need the cover to last. Our team will come back with the weight, the roll widths and the overlap plan that fit the job, and the numbers you can compare against any other quotation.
Mark Wu, Co-founder & Technical Director
Sichuan Zhifang Net Industry Co., Ltd. — Sichuan, China
sales6@cnshadenet.com ｜ +86 177 8077 1810 (WhatsApp)
