In PUSH THE ZONE: The Good Guide to Growing Tropical Plants Beyond the Tropics, David the Good shares his successes and failures in expanding plant ranges, and equips you with the knowledge you need to add a growing zone or two to your own backyard. Based on original research done in North Florida, PUSH THE ZONE is useful for northern gardeners as well. Discover microclimates in your yard, use the thermal mass of walls to grow impossible plants and uncover growing secrets that will change your entire view of what can grow where!