S. DEPARTMENT OF AGRICULTURE 



PLANT GROWTH REGIONS 



129 127" 125" 123 121 119 117 IIS* 113 III* 109 107 105 103 IQl" 98* 97' 



LEGI 



I North Pacific Coast 



2 Willamette Valley- Puget Sound. 



3 Central California Valleys. 



4 Cascade Sierra Nevada. 



5 Southern California. 



6 Columbia River Valley. 



7 Palouse-Bitterroot Valley. 



8 Snake River Plain -Utah Valley. 



9 Great Basin Intermontane. 

 10 Southwestern Desert. 



I I Southern Plateau. 



12 Northern Rocky Mountains. 



13 Central Rocky Mountains. 



10 Southern Rocky Mountains. 



15 Northern Great Plains. 



16 Central Great Plains. 



17 Southern Plains. 



lant Growth Regions by Furman Lloyd Mulford, Bureau of Plant Industry, U.S.DA 



Figu. 



