It’s almost summer! For the casual gardener, that means you probably want to get your new plants in the ground before it gets too hot. To avoid the extra effort of replanting every year, lazy gardeners like myself prefer perennials, since they can survive the winter and bloom without any help from me come the spring. Of course, not all plants thrive everywhere, so the first step in finding out whether a plant will survive the winter is to check its USDA Hardiness Zone. This is an indicator of how cold the weather can get before killing the plant.