Helena Merriman asks why so many people are drawn to gardening. Along the way, she discovers some secrets in the soil.
Why are so many people drawn to gardening? Helena Merriman speaks to a neuroscientist who's discovered that soil has some surprising qualities and she hears the extraordinary story of a prisoner in Guantanamo Bay who created his own garden.
Producer: Helena Merriman
Presenter: Helena Merriman
Editor: Andrew Smith.