Head gardener Scott Smith heads for the Picket Fence Garden to check on the roses. He will be looking at feeding, how to deal with diseases, explaining the differences in types of rose available, and sharing some propagation know-how. Lizzie Schofield joins him in the garden to revisits her perennial border. George Anderson is on his allotment in Joppa, where he will be updating us on the sweet potatoes he planted last month. He also checkis out his pumpkin and sweetcorn, and the apple trees will be getting a summer prune.