This week : Horticulturist Matt James investigates the dangers posed to the British countryside and waterways by invasive plants and Anne Swithinbank reveals the tricks of tulip cultivation.

The Q&A session comes from Nottinghamshire, with Bunny Guinness, Pippa Greenwood and Bob Flowerdew.

Friday 30th April 2010, 3pm

Sunday 2nd May 2010, 2pm