A plant's ability to withstand cold
temperatures is referred to as its hardiness. To help you find perennial plant varieties
suitable for your winter conditions we have included the information below. Please note -
these are general guidelines; actual hardiness may vary. For example, a perennial
considered to be hardy to zone 6 can be successfully grown in areas where the coldest
temperature does not fall below -10F.
| Zone # |
coldest winter temp. |
 |
Zone # |
coldest winter temp. |
| Zone 3 |
-40 to -30F |
|
Zone 8 |
10 to 20F |
| Zone 4 |
-30 to -20F |
|
Zone 9 |
20 to 30F |
| Zone 5 |
-20 to -10F |
|
Zone 10 |
30 to 40F |
| Zone 6 |
-10 to 0F |
|
Zone 11 |
Above 40F |
| Zone 7 |
0 to 10F |
|
|
|
