We speak to orchid experts at the recent RHS London Orchid Show and Plant Fair to get top tips on how to grow these most alluring of houseplants. Author and naturalist Jon Dunn shares his love of the native orchids that grow across the British Isles. Plus we talk to the people behind the incredible orchid displays planned for this year's RHS Chatsworth Flower Show. Chris Bavin, presenter of BBC's Britain in Bloom shares his experiences in filming the series, and we continue our countdown of the top garden problems from last year; this time it's over to diseases - will honey fungus stay top of the rots? For more info including plants mentioned and useful links see www.rhs.org.uk/podcast