Tree ferns, taming ramblers and why heritage fruit is good for your health

David heads to the annual symposium at Kells Bay gardens in County Kerry which attracts top horticulturalists from across the country. John Anderson from Windsor Castle gardens is planning for the future with climate change in mind. Alasdair Moore from the Lost Gardens of Heligan in Cornwall is championing the health benefits of heritage fruit. Also on the programme, Averil Milligan joins David to tackle listeners’ questions and Maurice Parkinson tames a rambling rose. Contact the programme on gardenerscorner@bbc.co.uk