David Maxwell visits Ireland’s largest gardening festival in Dublin’s Phoenix Park. At Bord Bia Bloom he’ll meet designers, growers and tour some of the 19 show gardens. Also on the programme, David finds out what’s happening in the gardens at Hillsborough Castle to mark the jubilee and what exactly is the ‘tree of trees’. Garden expert Ann Fitzsimmons will be in studio to answers questions and she’ll be planting up a platinum planter. Contact the programme on gardenerscorner@bbc.co.uk