What surprises might sprout from newly laid turf? What is the best compost? And what is 'companion planting'? Joining Peter Gibbs this week are grow-your-own expert Bob Flowerdew, garden designer Bunny Guinness and Pippa Greenwood, our expert in pests and diseases. In 2008, a special tree was planted in Flamstead, Bedfordshire. On the surface the plane tree seems normal, but it has an inter-galactic pedigree that is far from down-to-earth. Matt Biggs takes Dr Robert Massey from the Royal Astronomical Society and Professor Steve Miller from University College London to visit the tree and its owner. Producer - Daniel Cocker Assistant Producer - Aniya Das Executive Producer - Louisa Field A Somethin' Else production for BBC Radio 4