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The USDA Hardiness Zone Map divides North America into 11 separate planting zones; each growing zone is 10°F warmer (or colder) in an average winter than the adjacent zone. If you see a hardiness zone in a gardening catalog or plant description, chances are it refers to this USDA map.
The 2012 USDA Hardiness Zone Map. Move your mouse over the map to zoom in for a closer look at your area. The latest version of the USDA Zone Map was jointly developed by USDA's Agricultural Research Service (ARS) and Oregon State University's (OSU) PRISM Climate Group, and released in January of 2012.
Enter your zipcode and it will tell you exactly when you should plant all the common kinds of vegetables. Similarly, enter your zipcode to know when you can expect your first and last frost dates for your area or your USDA Hardiness Zone.
Thread OP. Hi! I keep finding my purple salvia flowers and bee balm leaf stems broken clean off and just left in the flower bed. I don't know what animal does that-it looks like a clean break and nothing looks to have been chewed.