USDA growing zones

California and Southwest

Arizona
California
Nevada
Utah

Conditions found here: Zones 5b through 10b

5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C
6b	-5 to 0 F	-17.8 to -20.5 C
7a	0 to 5 F	-15.0 to -17.7 C
7b	5 to 10 F	-12.3 to -14.9 C
8a	10 to 15 F	-9.5 to -12.2 C
8b	15 to 20 F	-6.7 to -9.4 C
9a	20 to 25 F	-3.9 to -6.6 C
9b	25 to 30 F	-1.2 to -3.8 C
10a	30 to 35 F	1.6 to -1.1 C
10b	35 to 40 F	4.4 to 1.7 C
11	above 40 F	above 4.5 C

Try the California Native Plant Link Exchange for collection of links to Web sites with information about California native plants, indexed by scientific name, arranged into two broad categories:

Availability - nurseries that sell the plant
Horticulture - information about growing the plant

Web site: http://www.cnplx.info/index.html

Texas and Central Midwest

Click on the map to enlarge and go to USDA details on Midwest-Southwest Zones 4b through 9b.

Arkansas
Colorado
Illinois
Kansas
Louisiana
Mississippi
Missouri
New Mexico
Oklahoma
Texas

Conditions found here: Zones 4b through 9b

4b	-25 to -20 F	-28.9 to -31.6 C
5a	-20 to -15 F	-26.2 to -28.8 C
5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C
6b	-5 to 0 F	-17.8 to -20.5 C
7a	0 to 5 F	-15.0 to -17.7 C
7b	5 to 10 F	-12.3 to -14.9 C
8a	10 to 15 F	-9.5 to -12.2 C
8b	15 to 20 F	-6.7 to -9.4 C
9a	20 to 25 F	-3.9 to -6.6 C
9b	25 to 30 F	-1.2 to -3.8 C

Links to information and sources for native plants in each of these states can be found at the National Resources Conservation Service. Scroll down to "Native Plants and Gardening."

Northwest

Click on map to enlarge and go to USDA details for Zones 3a through 9b

Oregon
Idaho
Montana
Washington
Wyoming

Conditions in Zones 3a through 9b

3a	-40 to -35 F	-37.3 to -39.9 C
3b	-35 to -30 F	-34.5 to -37.2 C
4a	-30 to -25 F	-31.7 to -34.4 C
4b	-25 to -20 F	-28.9 to -31.6 C
5a	-20 to -15 F	-26.2 to -28.8 C
5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C
6b	-5 to 0 F	-17.8 to -20.5 C
7a	0 to 5 F	-15.0 to -17.7 C
7b	5 to 10 F	-12.3 to -14.9 C
8a	10 to 15 F	-9.5 to -12.2 C
8b	15 to 20 F	-6.7 to -9.4 C
9a	20 to 25 F	-3.9 to -6.6 C
9b	25 to 30 F	-1.2 to -3.8 C

For information about gardening with native plants from this region, go to the Natural Resources Conservation Service and scroll down to Native Plants and Gardening.

Florida and Southeast

Alabama
Florida
Georgia
Mississippi
North Carolina
South Carolina
Tennessee

Conditions in Zones 3a through 9b

3a	-40 to -35 F	-37.3 to -39.9 C
3b	-35 to -30 F	-34.5 to -37.2 C
4a	-30 to -25 F	-31.7 to -34.4 C
4b	-25 to -20 F	-28.9 to -31.6 C
5a	-20 to -15 F	-26.2 to -28.8 C
5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C
6b	-5 to 0 F	-17.8 to -20.5 C
7a	0 to 5 F	-15.0 to -17.7 C
7b	5 to 10 F	-12.3 to -14.9 C
8a	10 to 15 F	-9.5 to -12.2 C
8b	15 to 20 F	-6.7 to -9.4 C
9a	20 to 25 F	-3.9 to -6.6 C
9b	25 to 30 F	-1.2 to -3.8 C

For information about gardening with native plants from this region, go to the Natural Resources Conservation Service and scroll down to Native Plants and Gardening.

Northeast

Click on map to enlarge and go to USDA details for Zones 2a through 7b

Connecticut
Delaware
District of Columbia
Illinois
Indiana
Kentucky
Maine
Maryland
Massachusetts
Michigan
New Hampshire
New Jersey
New York
Ohio
Pennsylvania
Rhode Island
Vermont
Virginia
West Virginia

Conditions in Zones 2a through 7b

2b	-45 to -40 F	-40.0 to -42.7 C
3a	-40 to -35 F	-37.3 to -39.9 C
3b	-35 to -30 F	-34.5 to -37.2 C
4a	-30 to -25 F	-31.7 to -34.4 C
4b	-25 to -20 F	-28.9 to -31.6 C
5a	-20 to -15 F	-26.2 to -28.8 C
5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C
6b	-5 to 0 F	-17.8 to -20.5 C
7a	0 to 5 F	-15.0 to -17.7 C
7b	5 to 10 F	-12.3 to -14.9 C

For information about gardening with native plants from this region, go to the Natural Resources Conservation Service and scroll down to Native Plants and Gardening.

Upper Midwest

Iowa
Minnesota
Montana
Nebraska
North Dakota
South Dakota
Wisconsin
Wyoming

Conditions found here: Zones 2b through 6a

2b	-45 to -40 F	-40.0 to -42.7 C
3a	-40 to -35 F	-37.3 to -39.9 C
3b	-35 to -30 F	-34.5 to -37.2 C
4a	-30 to -25 F	-31.7 to -34.4 C
4b	-25 to -20 F	-28.9 to -31.6 C
5a	-20 to -15 F	-26.2 to -28.8 C
5b	-15 to -10 F	-23.4 to -26.1 C
6a	-10 to -5 F	-20.6 to -23.3 C

For information about gardening with native plants from this region, go to the Natural Resources Conservation Service and scroll down to Native Plants and Gardening.

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