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.
Discover 10 plants for acid soils and the best plants for alkaline soils.
In addition to pH, you also need to know what texture of soil you have. There are six main types – loamy, clay, sandy, silty, peaty or chalky. Discover how to find out your soil type.
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. Here’s how to do it.
Find the right plants
You can find out which plants thrive in acid or alkaline soil by going to our plant database. In the ‘plant search’ facility you can select your soil type and find detailed profiles on a wide range of plants that will enjoy your conditions.