It may have been a wet start to the year outside, but inside our homes, it can be a desert for plants – especially if you forget to water! That’s perhaps why Cacti are the ultimate house plants and this week on Gardeners’ Corner with David Maxwell, Brendan Little reveals he’s inherited his dad’s 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 ‘blue’ marigolds – can it be true? Email the programme at gardenerscorner@bbc.co.uk