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This week Gardeners\u2019 Corner visits what must be one of most beautiful classrooms in the country \u2013 the walled garden at the College of Agriculture, Food and Rural Enterprise (CAFRE), Greenmount Campus in County Antrim. David Maxwell joins CAFRE\u2019s Lori Hartman for a look around, as work begins to renovate some areas including the hot border and a brand new brick pergola. At Mount Venus nursery, in the hills above Dublin, Oliver Shurmann has some spring highlights and Colin Agnew introduces the new Templeton trail at Belfast\u2019s Botanic gardens. In Killinchy, Anne Fitzsimmons is enjoying the spring heat in the polytunnel where she is sowing some perennials and she explains why it helps to pre-sprout your courgettes. In studio, Anna Hudson joins David to answer questions and provide some spring inspiration. Email the programme at gardenerscorner@bbc.co.uk