Colour therapy in Donegal, healing herbs you already have and Adam Frost's bulb of the month

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As autumn arrives, David heads to two very different gardens in County Donegal. His first stop is Cluain na dTor in Falcarragh, where expert plantsman Seamus O’Donnell has created an exotic garden full of hidden treasures, just a few hundred metres from the wild Atlantic Ocean. David discovers an Ethiopian banana plant and learns about the importance of slow gardening. Further north, herb expert Columbia Hillen tends Anamcara Healing Herb Garden, where native and exotic plants thrive on a hillside with dramatic views. The former journalist explains how her upbringing in Romania taught her to appreciate the healing properties of the plants growing beneath our feet. Also on the programme, Adam Frost chooses Crocus goulimyi as his bulb of the month, Katy Bell joins David in the studio with her autumn wildlife update, and gardener Claire McNally answers questions from listeners. Contact the programme at gardenerscorner@bbc.co.uk