U. S. DEPARTMKNT OF AGRICULTURK 
PLANT GROWTH REGIONS OF THE UNITED STATES 
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129° 127° 125 
87° 65° 83° 81° 79° 77° 75° 73° 71° 
121° 119° 117 
I North Pacific Coast 
2 Willamette Valley - Puget Sound. 
3 Central California Valleys. 
4 Cascade -Sierra Nevada. 
5 Southern California. 
6 ColumDia River Valley. 
7 Palouse-Bitterroot Valley. 13 
8 Snake River Plain -Utah Valley. 10 
9 Great Basin -Intermontane. I5 
10 Southwestern Desert. I6 
I I Southern Plateau. |7 
12 Northern Rocky Mountains. 
Central Rocky Mountains. 
Southern Rocky Mountains. 
Northern Great Plains. 
Central Great Plains. 
Southern Plains. 
LEGEND 
18 Northern Black Soils. 
19 Central Black Soils. 
20 Southern Black Soils. 
21 Northern Prairies. 
22 Central Prairies. 
23 Western Great Lakes. 
24 Central Great Lakes. 
25 Ozark -Ohio -Tennessee River Valleys 
26 Northern Great Lakes- St. Lawrence 
27 Appalachian. 
28 Piedmont 
29 Upper Coastal Plain 
30 Swampy Coastal Plain. 
3 I South -Central Florida. 
32 Subtropical Florida. 
Plant Growth Regions by Furftian Uoyd Mulford, Bureau of Plant Industry, U.S.DA 
Figure 1 Map prepared by Cartographic Drafting Unit 
