674 



PARKS 



PLATE No. 254 

 MAP SHOWING REGIONS WITH SIMILAR GROWING CONDITIONS 



Region I includes the whole North Pacific Coast from 

 below Santa Cruz Bay to the Canadian line. Its char- 

 acteristics are cool, dry summers with frequent fogs 

 and heavy winter rainfall, with lowest temperature 

 eight to ten degrees below freezing in the north to about 

 freezing in the south. 



Region 2 includes the Willamette Valley in Oregon 

 and the region of similar climate north of it in Washing- 

 ton, including the shores of Puget Sound. The summers 

 are warmer and drier than in Region I and the average 

 lowest temperatures are from ten to twenty degrees 

 Fahrenheit. 



Region 3 includes the Sacramento and San Joaquin 

 valleys in California. This region has hot, dry summers 

 and winters with fifteen to twenty inches of rainfall. 

 The temperature drops to ten or twelve degrees below 

 freezing on the valley floor, with slightly higher tem- 

 peratures on the hillsides. 



Region 4 includes the Sierra Nevada and Cascade 

 ranges of mountains. Conditions here vary consider- 

 ably according to elevation. Many native plants grow 

 well at the different altitudes, but at lower levels the 

 valley plants are suitable. At a higher elevation those 

 adapted to Region 28 will succeed if irrigation water is 

 available; if not, those suitable for Region 19 will be 

 best. For still higher elevations those listed for Regions 

 27 and 28, respectively, are the ones to use. 



Region 5 comprises all that part of California from 

 Santa Barbara to San Diego, Redlands and Riverside, 

 including what is popularly known as Southern Cali- 

 fornia. The summers are dry, cool on the coast, and 



warm inland; the winters are moderately rainy, being 

 nearly free from frost on the coast and in the foothills. 

 The same plants can be used here as in Regions i and 

 2, and in addition many plants recognized as less 

 hardy. 



Region 6 is the Columbia River valley. The summers 

 are warm, while the winters have temperatures of ten 

 to fifteen degrees Fahrenheit. 



Region 7 includes the plateau of the eastern part of 

 Washington and the valleys of the Idaho and western 

 Montana. The summers are warm, and the winter 

 temperatures range from zero to fifteen degrees below 

 zero Fahrenheit. 



Region 8 includes the Snake River plains and the 

 Utah valley. It is a semi-arid country with water avail- 

 able for irrigation. The summers are hot and the win- 

 ters cold. The same plants that succeed in Region 7 

 may be grown here. 



Region 9 is the northern part of the great arid interior 

 plateau included in Oregon, Nevada and Utah. Its 

 characteristics are hot days and frosty nights in summer, 

 with cold winters and less than ten inches of rainfall. 



Region 10 embraces all the Southwestern Desert, in- 

 cluding portions of California, Arizona and a corner of 

 Nevada. The climate is hot to scorching, with rainfall 

 from three to ten inches. 



Region II embraces the southern part of the great 

 arid interior plateau, including New Mexico and Ari- 

 zona. Its characteristics are the same as the plateau 

 farther north (Region 9), except that temperatures are 

 higher. 



