David Maxwell explores the new global medicinal garden in Belfast Botanic Gardens with Barbara Pilcher and Adrian Walsh. On the anniversary of the September 11th attacks, he speaks to New York garden designer Lynden B. Miller about the Queen Elizabeth II September 11th garden in lower Manhattan which remembers UK and Commonwealth victims. And if your late summer/early autumn borders are looking lacklustre, you need look no further than the National Botanic Gardens in Dublin for inspiration – David will be finding out how two key borders have been transformed with a nod to a Victorian gardening great. Also on the programme, Claire McNally and Claire Woods join David to tackle listeners gardening questions. Email – gardenerscorner@bbc.co.uk