68 Bulletin No. 34. 



plow, to seed the orchard from year to year, the only work nec- 

 essary being furrowing during early October and subsequent irri- 

 gation. Mr. Ward was one of the first men to sow the Yellow 

 sweet-clover for this purpose, having begun its use several years 

 ago. He believes it has been of great benefit to his orchard. 



A. J. McClatchik, 

 Department of Agriculture and Horticulture. 



PLANTING EUCALYPTS IN ARIZONA. 

 No. 2, October 16. 



The Arizona Experiment Station has been studying Eucalypts. 

 with a view to ascertaining which ones cai be successfully grown 

 in southern Arizona. 



The Eucalypts are evergreens belonging to the genus Euca- 

 lyptus, of which there are about 150 species. They are indigen- 

 ous to Australia and the adjacent islands, and have been introduc- 

 ed into many parts of the world having a similar climate. The 

 different species require different conditions of soil and climate. 

 About 50 species thrive in different parts of the southwestern United 

 States. Few of the species have common names that distinguish 

 them from each other, hence in speaking of them it is necessary to 

 use the scientific names in order to be accurate. The one most com- 

 monly grown in California, where the Eucalypts have found spe- 

 cial favor, is Eucalyptus globulus, commonly called Blue Gum 

 there. 



A much smaller percentage of the Eucalypts thrive here than 

 in California. In fact, it has been commonly supposed that none 

 would thrive here. This opinion was probably based upon the 

 fact that E. globulus, the prevalent one in California, endured 

 neither the heat of our summers nor the frosts of winter. 



It has been found that several species resistant to both heat 

 and moderate cold do thrive here, a few of which will probably 

 grow nearly if not quite as rapidly as the Blue Gum does in Cal- 

 ifornia. A few plants of various species have been set in various 

 parts of southern Arizona from time to time during the past eight 

 vears. Those that have done the best are E- viminalis, E. ros- 



