Panellists Chris Beardshaw, Anne Swithinbank and Matthew Biggs visit gardeners in Blackmore Vale, Dorset. Peter Gibbs chairs the programme.
In our exclusive feature series 'Behind The Scenes At Chelsea', we find out about the Eden Project's entry to this year's competition.
Matthew Biggs explores shade-loving plants from the caves at Cheddar Gorge.
The producer is Howard Shannon. This is a Somethin Else production for BBC Radio 4.