ARID AGRICULTURE. 



421 



TBEES FOB 



HIGH 



ALTITUDES 



KEY TO 



GROW 



Spruce, Douglas Spruce, Box Elder, Green Ash, 

 White Ash and Elm. While they are general 

 lovers of water, there are none which are so sure 

 to succeed on arid farms as the Cottonwood, 

 Russian Willows and Poplar. Always plant 

 the Cottonless Cottonwood. The Cottonwood is 

 a native and so hardy that it succeeds with little 

 moisture, where others fail. 



The most drouth-resistant fruit trees are 

 sour cherries and the more hardy apples. There 

 are many producing orchards above irrigation 

 where only the rainfall is depended on, of cher- 

 ries and apples. The more hardy apples are 

 among the hardiest of all trees. 



Above 6,000 feet altitude on the plateau re- 

 gions, plant only the Cottonless Cottonwood, the 

 Willow and the Pine. In yards for ornamental 

 purposes the Colorado Blue Spruce and the na- 

 tive Red Cedars will succeed anywhere if they 

 can be watered. Hardy apples, cherries, and 

 American plums succeed where any protection 

 and care can be given them. The choicest hard 

 wood trees are the Elm and White or Green Ash. 

 The writer has seen splendid specimens of the 

 Russian Mulberry, loaded with fruit, in a pro- 

 tected place about 7,000 feet altitude in North- 

 ern Colorado. 



A partial list of the trees which are now 

 wn, growing successfully in the different sections of 

 the arid region will indicate the known possibil- 



