Claudia Hammond reports on a trend which has emerged from the world-famous Chelsea Flower Show this year - a growing number of gardens designed with mental health in mind. So what is it about gardens and nature which makes us feel better? The Mothers for Mothers "This Too Shall Pass" garden is designed by Polly Wilkinson - a former counsellor who's worked with adolescents and new mothers with anxiety and depression. The charity's CEO Maria Viner wanted to reflect the joys and pain of motherhood - so Polly constructed a pathway with a crack in it - which narrows and is almost "fixed", echoing the impact that peer support can bring. The lifting of low mood is also seen as muted green and blue flowers give way to apricots and pinks. Sue Stuart- Smith is a psychiatrist, psychologist and now author of the bestselling book The Well Gardened Mind. She says it's hard to untangle the factors which might be contributing to the impact of nature on us. Dr Stuart-Smith explains how a study in th...