Have you ever wondered why the tulip polar is the state tree of Kentucky and Indiana, or what would be the best vine to grow in the shadow of such a tree? Well HomeGrown answers both questions this week with interviews with the University of Kentucky’s Deborah Hill, who knows a lot about tulip poplars and agroforestry, and Georgia plantsman Allan Armitage, author of “Armitage’s Vines and Climbers” from Timber Press. Downloadable MP3Find out more: