I interview Nick McCullough, horticulturist, nurseryman, designer, speaker and author, about his new book, written with his wife Allison and Teresa Woodard. Titled American Roots, the book explores some of the best of our gardens, and gardeners, right here in America. After last week's announcement of us moving away from this garden, I begin to talk about HOW I will choose plants to take or leave and the process of ending one garden and starting another.