In this week's special double-length episode of Still Growing (SG529), Robert Kourik, the author of 15 gardening books including Understanding Roots: Discover How to Make Your Garden Flourish. Imagine if you could go out into your garden and see what is going on below ground. There is a hidden world of roots many of us don't every really think about - but Robert Kourik has been thoughtfully researching roots for well over a decade.