Kathy Clugston and team are at the London Stadium for the tenth anniversary of the 2012 Olympics. Fielding questions from a live audience are experts Matthew Wilson, Christine Walkden and James Wong. This week, the panellists answer queries on biodiversity in playgrounds, improving soil quality, and how much neglect the resilient pelargonium can take. Over in the Queen Elizabeth Park, Ashley Edwards chats to Design Principal Ruth Holmes about the special legacy held by the park's horticulture and, down on the pitch, Head Groundsman James Williams tells us how they keep the stadium turf in tip top shape. Producer: Daniel Cocker Assistant Producer: Bethany Hocken A Somethin' Else production for BBC Radio 4