The heat zone map was developed by the American Horticultural Society. You can also enter your zip code and find your heat zone that way. (Not all plants have been assigned a heat zone, though, so it's seen less often than the hardiness zone.) ...
Because Heat Zone ratings are relatively new, not all catalogs, web sites and garden centers currently indicate a plant's Heat Zone. But more and more, you will begin to see two ratings for a given plant, such as 5-10, 11-1.
AHS Heat Zone Map
Marc Cathey and the American Horticultural Society also led the charge to create a map that categorizes plants not by the absolute cold they can withstand but by the amount of heat they can survive.
Your cold and heat zones
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Discover Garden Gate magazine, the Illustrated guide to Home Gardening and Design. You'll find you CAN create the garden of your dreams! Here's how: ...
Here in Texas, we're much more concerned with how HOT the plants can take it, but it's rarely on a label telling you that this plant can or cannot take a certain HEAT zone.
Grayish in appearance, actinomycetes work in the moderate heat zones of a compost pile. They decompose some of the more resistant materials in the pile such as lignin, cellulose, starches, and proteins.
Heat tolerance: AHS heat zones 8-6
Light preference: Partial shade (full sun in cool climates)
Soil preferences: Humus-rich, moist but well-drained soil
Propagation: Divide in early summer, after flowering ...
USDA Plant Hardiness Zone Map
American Horticulture Society Heat Zone Map
Sunset Climate Zones
Gardening Around the Weather ...
Although the author encourages the use of wildflowers or naturalized plants, Heat-Zone Gardening does boast more than 100 pages of various plants, their USDA hardiness and AHS heat zones, and which soil and water conditions are best for each.
SmartGarden program teaches gardeners how to assess their own needs, recognize the possibilities of a location, and then create a garden that is in tune with the environment. A coding system, assigned to each plant, uses hardiness and heat zones, ...
Even if you don't download the map, the article about hardiness zones is very interesting. Note that the AHS site also soon will include a searchable by zip code feature to find hardiness zones similar to the heat zone search feature now on the site.
 See also: Plant, Hardiness, Hardiness zone, Gardener, Water
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