Best Landscape Fabric for Draining Water

If you want a weed-free area in your garden, landscape fabric laid as a weed barrier is a good option. Whether it is for a walkway, a seating area or easier weed control in garden borders, it saves a lot of weeding over the years. For areas that also need to drain well, the type of fabric matters.

Looking for the Best Weed Barrier

To choose the right material, it helps to know the options and how each one behaves. Below are the main features of landscape fabric, its advantages and limitations, and how it lets water through.

Landscape Fabric and Its Working

Landscape fabric is a thick horticultural textile, usually sold in rolls. Materials vary by manufacturer, but most fabrics are made from polypropylene or polyester, sometimes from recycled plastic. They are either woven from flat tapes or made as a non-woven sheet of bonded fibres.

The fabric has thousands of tiny openings across its surface, which let water pass through and drain into the soil below. In woven fabric the openings are the gaps between the tapes; in non-woven fabric they are the pores between the fibres, formed during manufacture.

Advantages of Landscape Fabric:

Weed Reduction

The main job of landscape fabric is to act as a weed barrier: it stops sunlight reaching weed seeds in the soil below, so they cannot grow. It works best under a surface layer such as bark mulch or gravel, which also protects the fabric from sunlight.

Cost-Effectiveness

Landscape fabric is affordable on most budgets and usually lasts several years, keeping weed growth down for that whole time.

Water Conservation

Weed barrier fabrics reduce evaporation from the soil surface, so plants need less watering. This is especially useful in dry areas and during drought.

Landscape fabric also has some weaknesses, so it is not the right choice for every garden.

Landscape Fabric Limitations:

Limited Breathability

The fabric restricts air movement into the soil, which can reduce aeration around plant roots.

Blocks Nutrients

Landscape fabric stops organic matter such as grass clippings and decaying mulch from returning to the soil, so the soil beneath gets fewer nutrients over time. On the other hand, by slowing water movement through the surface, it also reduces the amount of nutrients washed away.

Some Structural Weaknesses

Landscape fabric is tough but not impenetrable. Vigorous plants such as bamboo can push through it, and once it is pierced it stops weeds less well. Weeds can also root in soil and debris that collect on top of the fabric.

How Does Landscape Fabric Allow Water Through

Landscape fabric lets water through because it has thousands of tiny openings in every square metre. They are small enough to block most light and stop weeds growing through, but large enough for water to soak through freely, so you can water plants straight through the fabric.

Woven fabrics drain more slowly than non-wovens and can puddle on flat ground. Where drainage is the priority, such as under gravel paths, patios and drainage trenches, a needle-punched non-woven fabric drains much better and also keeps soil from clogging the gravel. Ocean supplies non-woven geotextiles for these landscaping and drainage uses.