Join David Maxwell with Gardeners' Corner this week as he walks and talks trees with Averil Milligan and makes the most of autumn colour. Hints on making leaf mould known as gardeners' gold and Helen Mark and Conrad McCormick visit a gardener in Cullybackey with advice on creating an exotic garden. Also in the programme why expert gardener Stephen Barstow created the term edimentals and allotmenteers in Ballysillan enjoy the fruits of their labour.