Inorganic Mulches

The cheapest form of inorganic mulch is black plastic. This is only useful if the ground is flat and free of pebbles because black plastic tears easier than other mulches. It's not attractive either and needs to be held down well. Once used for a season it's unlikely to be in a fit state to be used again. It is very good at retaining moisture and will kill most weeds and prevent them from reappearing.

Woven Black Plastic is similar to black plastic but is much stronger and can be re-used for several years. It is however more expensive compared to black plastic.

Fibre fleece almost floats on the surface of soil and plants. It keeps in the warmth and excludes pests. It is not so good at retaining moisture or killing weeds.

Grit and pebbles are frequently used because they are attractive and permanent. The are reasonably good at retaining moisture and preventing weeds. Coarse grit will deter slugs to a great degree.

To use the black plastics, simply cut them to size and lay them on the soil. They need to be securely anchored down with stones, bricks or soil to prevent them blowing away in strong winds. As with any mulch, make sure the soil is well-watered before you apply the mulch. Click the picture on the left to see plastic laid on a newly dug allotment.

To use the black plastics, simply cut them to size and lay them on the soil. They need to be securely anchored down with stones, bricks or soil to prevent them blowing away in strong winds. As with any mulch, make sure the soil is well-watered before you apply the mulch.

To lay pebbles or grit, simply pour them on the ground to a depth of about 5cm (2in). They can then be levelled off with a rake or a spade.

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