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Have you ever heard of a dandelion tree? This week David Maxwell discovers it in the front garden of a Bangor teenager with a passion for plants. Andrew Gee has crammed the small space with exotics that survive year round in the mild coastal microclimate. One caller wants advice on growing gherkins in the house and Amy Kelly has some top tips on succession sowing for constant cropping. Maurice Parkinson praises the attributes of Astrantia and David is joined in studio by garden expert Brendan Little. Send your questions to gardenerscorner@bbc.co.uk