17 



by the use of cuttings from the male form of the tree, which does 

 not bear seed. However, where the cotton is not objectionable seed- 

 lings are preferable to cuttings. 



CAROLINA POPLAR. 



Carolina poplar has been propagated from cuttings by nurser} T men 

 and the stock sold by them does not produce seed or cotton. This, 

 together with the tree's rapid growth and good form, has given it a 

 prominent place in ornamental planting, especially in the Middle 

 West. 



In the South Platte country, aside from a few localities where 

 borers infest it, Carolina poplar is usually successful. Its insect 

 enemies seem to be localized. At Greeley, Colo., for example, it is 

 attacked by borers and dies within three or four years from the time 

 it is set out, while in near-by localities, as at Fort Collins and Love- 

 land, it reaches a large size. The tree has not been thoroughly tested 

 in the North Platte Valley, but it can be planted with reasonable 

 assurance of success. 



Carolina poplar grows more rapidly than common cottonwood, but 

 as propagated in the West it is neither so hardy nor so long-lived. 

 However, its fuel value is high, and even if the trees die early, they 

 will provide valuable fuel. 



LOMBARDY POPLAR. 



A tree that has proved hardy in these regions is the Lombardy poplar, 

 introduced from Europe. Because of its narrow, upright form, it is 

 especially adapted to ornamental planting. Its economic value is 

 limited to its use for fuel. 



WHITE POPLAR. 



White poplar is another tree introduced from Europe that has been 

 widely planted in the United States for ornament. It can be recom- 

 mended for both valleys for this purpose. 



WILLOWS. 



For quick-growing windbreaks several of the willows are excellent, 

 among them white, black, and Russian willows. Black willow is native, 

 while the other two species are from Europe and by far the better trees. 

 Like cottonwood, willow is a moisture-demanding tree, and does best 

 on rich bottom soils. With proper irrigation, however, it will succeed 

 on the table-lands. Willow does not yield quite so well as cotton- 

 wood, but its fuel value is somewhat higher and the wood is more 

 resistant to decay. When planted singly, white willow and Russian 

 willow are highly ornamental. 



[Cir. 109] 



