Hardiness zones are rated from 1 to 11, where 11 represents a Tropical climate and 1 is an Arctic climate. (They are sometimes referred to as USDA zones because this rating system was developed by the United States Department of Agriculture).
Many nurseries provide zone ranges or limits in their descriptions of plants for sale. Similarly, I've provided a range for each type of flower I discuss. Thus, Giant Dutch Crocuses typically thrive in zones 4 - 8, while Flame Anemones are normally happiest in zones 8 - 9.
Examine the maps below to find what zone you live in:
Another useful reference is the USDA Plant Hardiness Zone Map site, provided by the National Arboretum. This site lets you click on an area within North America, and see that area's zone in more detail.
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Last modified: October 11, 2008