Carol Klein flies the flag for conifers. On her revival, she visits the pinetum at RHS Garden Wisley to learn how we first became obsessed with conifers; she drops in on an old friend in the Peak District who has an extraordinary collection of dwarf conifers; and she tries to convince the people of Matlock about the joys of conifers by creating an amazing island installation in a local park. Throughout the show Carol shares here expertise and passion for these misunderstood plants. Tom Hart Dyke wants to give pelargoniums - often incorrectly called geraniums - back their rightful name. On his campaign he visits a garden centre in an attempt to re-educate the public about pelargoniums; he visits the biggest pelargonium collection in the world; and he spreads the word when he hits the campaign trail for his pelargonium referendum.