Do Garden Sleepers Affect Soil PH?

Garden sleepers, typically made from treated timber, can indeed affect soil pH over time. The type of treatment used on the wood can introduce chemicals into the surrounding soil, potentially altering its acidity or alkalinity. For instance, sleepers treated with certain preservatives might leach copper, chromium, and arsenic, which can increase soil acidity. However, the degree of impact largely depends on factors such as the type of wood, the treatment used, and environmental conditions like rainfall, which can accelerate leaching.

To mitigate any potential impact on soil pH, it's advisable to choose sleepers made from untreated or naturally resistant woods like cedar or oak. Additionally, lining the soil-facing side of the sleepers with a protective barrier can help reduce direct contact between the wood and soil, minimising chemical leaching. Regular soil testing can also be beneficial for gardeners aiming to maintain specific pH levels, ensuring the health and productivity of their garden beds.