Suggested hardiness zones are indicated by each tree. For example, zones 4–9 means a tree is hardy in zones 4, 5, 6, 7, 8, and 9, according to the U. S. Department of Agriculture hardiness zone map. (Click here and use your zip code to see what zone you live in). If a tree is hardy in a particular zone, it can be expected to grow in the zone's temperature extremes. These zones do not take into account local variations such as moisture, soil, winds, and other conditions which might affect the viability of individual trees.