What trees work well in small spaces? This week David Maxwell visits two experts who have the answer. Amy Kelly’s small suburban garden is full of fruit trees including the mysterious Medlar fruit. Once commonplace in Britain and Ireland, the fruit, which has to be left to over-ripen, has fallen out of favour. Amy thinks the tree still deserves a place because it provides several seasons of interest and fruit to boot! In Ann FitzSimons’ Killinchy garden, she is growing a variety of shrubs and trees in pots. It makes for a permanent display and offers those with limited space or those renting the chance to have an interesting garden space. Also on the programme, David visits Billy Alexander in Kells Bay where he is preparing for his biggest display of ferns yet at next year’s RHS Chelsea Flower Show. In studio, Colin Agnew, takes questions and provides some Autumn inspiration. Email the programme at gardenerscorner@bbc.co.uk