Did you know that there are 30 different species of worm in the UK? Or that fungi can actually help create habitats for wildlife? This week we're exploring the roles played these crucial but often overlooked garden residents. Back indoors we meet a hidden hero of horticulture - ‘likely the most prolific botanical explorer of the early 20th century’. Staff from RHS Garden Wisley and the Royal Botanic Garden Edinburgh join forces to tell his story. For links please visit our show notes or rhs.org.uk/podcast