How do you garden for gorillas? David meets the man who was in charge of planting at Dublin Zoo for four decades. Stephen Butler explains how the plants enhance the environment for the animals and give a sense of their natural habitat. At Ballywalter, Anna Hudson is building walls out of logs \u2013 an attractive feature in any garden and great for wild life. In Greyabbey, on the Ards Peninsula, there is a secret garden called Greba \u2013 David meets up with owners Richard and Beverley to find out how they have transformed a disused quarry into a place of beauty. In studio Claire McNally and Mary Doris answer questions and have some gardening related ideas for Mothers\u2019 day. Email the programme on gardenerscorner@bbc.co.uk