2011 July Feature is Growing Zones
What is my Growing Zone and why does it matter?
This map supersedes U.S. Department of Agriculture Miscellaneous Publication 814, "Plant Hardiness Zone Map," which was revised in 1965. This 1990 version shows in detail the lowest temperatures that can be expected each year in the United States, Canada, and Mexico. These temperatures are referred to as "average annual minimum temperatures" and are based on the lowest temperatures recorded for each of the years 1974 to 1986 in the United States and Canada and 1971 to 1984 in Mexico. The map shows 10 different zones, each of which represents an area of winter hardiness for the plants of agriculture and our natural landscape. It also introduces zone 11 to represent areas that have average annual minimum temperatures above 40 F (4.4 C) and that are therefore essentially frost free.

How to Use the New Map
Zones 2-10 in the map have been subdivided into light- and dark-colored sections (a and b) that represent 5 F (2.8 C) differences within the 10 F (5.6 C) zone. The light color of each zone represents the colder section; the dark color, the warmer section. Zone 11 represents any area where the average annual minimum temperature is above 40 F (4.4 C). The map shows 20 latitude and longitude lines. Areas above an arbitrary elevation are traditionally considered unsuitable for plant cropping and do not bear appropriate zone designations. There are also island zones that, because of elevation differences, are warmer or cooler than the surrounding areas and are given a different zone designation. Note that many large urban areas carry a warmer zone designation than the surrounding countryside. The map-contains as much detail as possible, considering the vast amount of data on which it is based and its size.

In using the map to select a suitable environment for a landscape plant, today's gardeners should keep in mind the following:

Stress Factors. We became aware of additional stresses to plants during the 1970's. Acid rain, gaseous and particulate pollution, security lighting, and toxic wastes, among many other stress factors, have significantly increased the potential for unsatisfactory performance of landscape plants. We need to document the tolerances of plants to these factors.
New Plant Management Systems. New techniques of planting, transplanting, watering, fertilizing, and providing pest control measures have done much to increase the vigor of landscape plants. But used unwisely, these same measures can reduce plant hardiness.

Artificial Environments. We have pushed the use of plants into totally artificial environments such as expressways, malls, elevated decks, and buildings where plant roots are totally removed from the ground and its warming influence. The assortment of plants that can adapt to such environments is proving to be very restricted. Hardiness ratings alone are inadequate to guide landscapers in selecting the most successful plants.

Florida Growing Zones
The USDA map (can be viewed below for Florida), was last updated and released in 1990 (based on weather records from 1974-1986) and was the standard measure of plant hardiness throughout the United States until 2006. In 2006 the Arbor Day Foundation completed an extensive updating of U.S. Hardiness Zones based upon data from 5,000 National Climatic Data Center cooperative stations across the continental United States.

Please be aware that Plant Hardiness Zones are only a general guide. Many other factors influence whether a plant will survive in your garden or not. You must also consider: Soil types, rainfall, daytime temperatures, day length, wind, humidity and heat. Within your own yard, block and county, there are microclimates that affect how plants grow. One part of your yard may be hotter, colder, wetter, dryer, shadier or sunnier than another and certain plants may do better in one spot than another because of this. The zones are a good beginning, but you still need to determine for yourself what will and won't work in your garden.

The FloridaGardener Interactive Web Version of the 1990 USDA Plant Hardiness Zone Map for Florida.

Compare the color of the section in your area on the map with the color key below. Click on the general area of where you live for a closer look.

About Plant Hardiness Zones
Plant hardiness zones are a general guide to help you know which plants will grow where you live because plants vary in the temperature extremes they can endure.

Years ago botanists and horticulturists started gathering weather records throughout the United States to build a database to show the average coldest temperatures for each region of the U.S. These records were consolidated into a range of temperatures and converted into various zones of plant hardiness. Maps were then made to show the delineations between these temperature zones.



This site was last updated 10/19/11