The pH of the soil, or the measure of acidity or alkalinity. It is an important factor in determining the availability of nutrients to lawn grasses. The pH scale ranges from 0 to 14, with 7 being neutral. Soils that have a pH below 7 are considered acidic. While soils with a pH above 7 are considered alkaline.

Grass prefers a soil pH between 6 and 7, which is slightly acidic. At this pH, the most important nutrients for lawn grass, such as nitrogen, phosphorus, and potassium, are most available for the plant to absorb. Additionally, the availability of other micro-nutrients, such as iron and manganese, is also optimal at this pH range.

When the pH of the soil is too low or too high, the availability of these essential nutrients can be limited, resulting in a lawn that is thin, patchy, or yellow in colour. For example, when the soil is too acidic, the availability of phosphorus, potassium, and calcium is reduced, which can lead to poor root development, slow growth, and weak turf. On the other hand, if the soil is too alkaline, the availability of iron, manganese, and zinc can be limited, resulting in the yellowing of the grass and stunted growth.

To maintain the optimal pH for your lawn, it’s important to test the pH of your soil regularly. This can be done by using a soil test kit or by sending a sample of your soil to a testing lab. Once you know the pH of your soil, you can take steps to adjust it if necessary.