U.S.D.A. Hardiness Map - A temperature zone for your area is set forth on the map below by zone number.  Each plant variety that has a zone listed here is the area where the variety has been tested and shown to be hardy.  If a plant variety has your zone number or a smaller number it should be hardy in your area.  With no quarantees, there is a good probability that varieties having a zone number one above yours will survive.  Please note, however, the hardiness map is intended only as a guide as there are variations in each temperature zone.