World-renowned perennial plant experts Roy Diblik and Piet Oudolf join Mike and Peggy to talk about plant communities and good design. On the heels of the discovery in the Midwest of P. ramorum, a pathogen that has the potential to kill oak trees, Tom Buechel returns to the show to explain how the Plant Sentry program can protect states from diseases, pests and invasive plants. Martie Sanders and the actors at Green Team Chicago are back with a report on this summer's production, "...not for all the tea in China!" (Hint: it's about the history of tea.)