Of the 89 people who responded to the poll, 79 (88%) cited mental wellbeing as a key health benefit for spending time in their gardens.
The second most popular response was that respondents "generally feel fitter" when spending time in their gardens. "Increased mobility" and "strength" came in joint third place. Respondents could vote for multiple answers, and there were 156 votes in total.
The company said the research shows that, among Bakker Spalding’s customer base, gardening is perceived as a major way in which mental wellbeing can be improved.
Bakker Spalding Garden Company managing director Adrian Nind said: "According to the Mental Health Foundation, about a quarter of the UK population will experience some kind of mental health problem in the course of a year, and gardening really can help."