Soil analysis

This service provides an analysis of soil texture, pH, organic matter and three major plant nutrients (potassium, phosphorus and magnesium) for gardeners. You receive a detailed interpretation of the results as well as fertiliser recommendations for either fruit, vegetables, ornamentals or lawns. A fee is charged for this service; RHS members: £30 per sample; non-members £35 per sample.

A pack containing sample bags, a pre-addressed envelope and sampling instructions for those wishing to use the service is available on request. It is important to follow the instructions carefully and send the samples and correct fee back in the envelope provided. The completed report is then usually returned within 14 days*.

*Due to demand the turnaround time for this service is currently up to four weeks.

Please note that the service only involves analysis of nutrients in garden soils. Nutrient analyses of composts, manures or container media are not available, nor is the analysis of potential soil contamination.

To obtain a sampling pack please contact the RHS Gardening Advice.


RHS Garden Wisley
Surrey GU23 6QB

Mark your envelope 'Soil Analysis Service'.


Please note: we are unable to accept soil samples from outside the UK.

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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.