The relative effects of access to public greenspace and private gardens on mental health

Abstract

Although the beneficial effects of urban greenspace on mental health are widely accepted, the comparative effects of public greenspace and private (domestic) gardens on mental health are poorly understood. Here, an assessment is provided of the effect of local public greenspace on a person’s mental health for those with and without a private garden in Britain. Individual level data on private garden ownership and mental health status are obtained from a nationally representative survey (the British Household Panel Survey). A combination of statistical matching and regression models are used to account for individual and area-level confounders and to test for interactions. Individuals with (n = 4,454) and without (n = 338) private gardens are analysed separately and their predicted probability of poor mental health in response to public greenspace presence is compared. Results show that the predicted positive effect of having a private garden varies depending on gender and age. Specifically, having a private garden substantially reduces the maximum predicted probability of poor mental health for men regardless of their access to local public greenspace. Whereas, for women, the presence of local public greenspace results in comparable mental health for those with and without a garden. Women without access to local public greenspace, having a private garden reduces the predicted probability of poor mental health later in life. Given the results, it is recommended that the provision of private gardens is considered within greenspace guidance and policy, which is currently dominated by the provision of, or access to, public greenspaces.