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It may have been a wet start to the year outside, but inside our homes, it can be a desert for plants \u2013 especially if you forget to water! That\u2019s perhaps why Cacti are the ultimate house plants and this week on Gardeners\u2019 Corner with David Maxwell, Brendan Little reveals he\u2019s inherited his dad\u2019s obsession with these prickly plants. Also on the programme, daffodil enthusiasts from around the world arrive in Northern Ireland for the World Convention and David heads to a rare collection of shrubs and trees at the Bluebell Arboretum in Derbyshire. In studio, expert Ann Fitzsimmons will answer questions including one from a listener who has seen seed for sale for \u2018blue\u2019 marigolds \u2013 can it be true? Email the programme at gardenerscorner@bbc.co.uk