What is a hardiness zone? Canada has nine zones, ranging from 0
(the harshest) to 8 (the mildest). Each zone is divided into two
parts, with “a” being harsher than “b.” In creating the zone
map, minimum and maximum temperatures, snow cover, rainfall,
wind patterns and the average number of frost-free days were all
taken into account. But as gardeners know, our weather patterns
vary from year to year, especially with the effects of global
warming. In addition, the location (south side versus north
side) of your plot can affect the growing conditions of your
plants. How do you use it? As a general rule, if you live in
Zone 6, you should have good success with plants hardy in Zone 6
and up to three zones colder. Plants hardy to Zone 8 would never
survive the winter in your yard. So, although the zone map is a
useful starting point for all of us, consider your own yard’s
conditions and your area’s weather fluctuations when choosing
yearly plantings. Here are some links to help you determine what
zone you're in. -