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Technical Info: Compost as a Landscape Mulch

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This process consists of applying a compost mulch to the soil surface following planting activities. This specification applies to the mulching of various types of plant materials, including trees, shrubs, herbaceous plants and bulbs.

See our landscaping Case Study - breathing life back into Sackville Gardens.

Fairfield's compost meets the requirements of the British Standards Institution Publicity Available Specification (PAS) 100, which guarantees an appropriate and safe product.

Our compost meets the minimum standards of PAS 100, and the specification limits on stones, weed seeds and physical and chemical contaminants. Below are further requirements, in addition to PAS 100, for the use of compost in this specific application:


Units of Measure

Recommended Range


pH Units (1:5 water extract)

 6.0 - 9.0

Moisture Content

%mm of fresh weight

35% - 55%

Organic Matter Content

% dry weight basis

30% minimum

Electrical Conductivity

mS/m (1:5 water extract)

300 maximum

Particle Sizing

% m/m of air-dried sample passing the selected mesh

99% pass through 75mm screen

minimum 25% pass 10mm screen



Meet BSI PAS 100* Criteria

*Fairfield Compost is pH7

Use of Mulch Material for Landscaping

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