On the Verge - Compost: Costa shows us his fantastic compost recipe using ingredients donated by the community. Magical Mushrooms: Keen to grow mushrooms at home, Tino meets a mushroom farmer in Tasmania to get some ideas. Home at Last: John discovers a beautiful garden in Melbourne that blends a formal garden design with the informality of surrounding bush. A World Inside a World: Costa and Angus take a closer look at the millions of individual organisms in compost and show us how to troubleshoot compost problems. A Day At The Zoo: Jane heads to the Melbourne zoological gardens to discover how all the green and brown waste is handled.