In Magherafelt, David Maxwell visits Yew Cottage garden where Philip Stewart is turning his pond into a sunken garden. He hopes to turn a ‘frost pocket’ into a place for tender plants including bananas. In County Clare, Karoly Torok takes us on a tour of Vandeleur Walled Garden, which is now a thriving community space after years of neglect. Colin Agnew joins David in studio to take questions including one on how to grow asparagus. And a tribute to long-time listener and chrysanthemum expert Herbie McCauley, who has passed away at 86. Email the programme at gardenerscorner@bbc.co.uk