Plans to refurbish an old shed, unclogging a blocked garden stream and potting up home-grown seedlings face the amateur horticulturalists. Ann-Marie Powell re-visits Lisa Jacobson's London home, to help turn her old shed into a part tool-store and part playhouse for her two young daughters. Carol Klein dons her waders and plunges into the mud, lending a hand to Adrian and Debbie Taylor's clearing of a mill stream running through the garden of their Devon home. Monty Don returns to Bryony and Martin Jacklin's Norfolk home to help with the creation of circular flower beds and grassed walkways.