The main factors affecting hardiness are the minimum winter temperature, the number of hours of cold every winter, the amount of heat every summer, and the relative wetness or dryness of the climate. Many are actually injured by a single freezing night.
Others Palms withstand zero degrees F for short periods without damage.
Some of the palms that that you can plant, grow and care for are: Minimum temperatures: 20 to 30°F One of the smallest regions in the plant hardiness zone map, Zone 9 includes central Florida, the Gulf coast of Louisiana and Texas, much of California and the southern Oregon coast.
This mild-winter region is characterized by a long growing season and almost no winter freeze. Some of the palms that that you can plant, grow and care for are: Minimum temperatures: 30 to 40°F Zone 10 is virtually free of winter chill and is dominated by balmy ocean influences.
It stretches along parts of the California coast and covers the tip of Florida into the Florida Keys.
Zone 10 can also be found in northern Kauai and the central part of the island of Hawaii.
In the East, ocean influences allow Zone 7 to continue north along the New Jersey coast, Long Island and Cape Cod.
Westerly, it snakes through southern New Mexico, bits of Arizona, Nevada and southern Utah, up the eastern border of California into the central mountainous regions of Oregon and Washington, and into Alaska's Inland Passage.
Only the hardiest plants will survive in the extreme winter cold and short growing season of Zone 1. Minimum temperatures: Below -50 F Zone 2 stretches primarily across most of Northern Canada to Alaska's interior and the Bering Sea; some of the highest mountain areas of Wyoming and Montana also fall into this zone.
Although still an area of extremely cold winters, Zone 2 is modified by the warming influence of large bodies of water. Minimum temperatures: -40 to -30°F Zone 3 can be found in Alaska; southern Canada; along Hudson Bay and mainland Newfoundland; in the interior areas of Maine, Vermont, and upstate New York; across the northern Midwest; and into Montana.
Minimum temperatures: -20 to -10°F Although gardeners in Zone 5 still experience winter cold, this zone benefits from lower latitudes and an ocean influence.