In order to get the best out of your garden plants and crops, it’s worth testing your soil pH. In the UK this ranges from 3.5 (strongly acid) to 8.5 (strongly alkaline), with 7 being neutral. Most fruit and vegetables prefer soils that have a neutral to slightly acidic pH.
The availability of nutrients, such as calcium, potassium, iron and magnesium, is influenced by pH. In addition, at a pH of 6 to 7.5 the soil organisms that break down organic matter and release nutrients are at their most active. The soil’s pH can also affect the incidence of certain diseases and cultural problems. Clubroot, which attacks brassicas, prefers acid soil, for example, while alkaline soil encourages scab on potatoes.
For a rough indication of your local soil pH, look at what grows well in nearby gardens. If camellias and rhododendrons thrive, the soil is acidic, while flowering cherries, yew and clematis prefer alkaline soils, such as those on chalk.
Testing your soil is quick and easy - simple pH testing kits are available in most garden centres.
How to do it