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IOWA DEPARTMENT OF AGRICULTURE 



HEJixocK — (Tsuga canadensis) 



The eastern hemlock is a native to the northeastern United States 

 and extends as far west as the Lake States. It is a very desirable tree 

 for ornamental planting, due to its symmetry and to the graceful, droop- 

 ing, soft foliage. It is suitable for planting on moist situations but is 

 difficult to establish on upland soil where it is exposed to the summer 

 winds. 



The tree has little value for commercial plantations, because of the 

 inferior quality of the wood. It is occasionally used for windbreak 

 planting. 



DOUGLAS FIR — (Pseudotsuga taxifolia) 



The Douglas fir is native to the Rocky Mountain region and western 

 United States. Individual trees in Iowa appear to be quite hardy. The 

 new leaves, especially on young trees, are frequently killed by late spring 

 frosts. On this account young trees are often of undesirable shape and 

 poor in appearance. The tree has value for ornamental planting and 

 possibly for windbreaks but is not recommended for general planting 

 except in moist, protected situations. 



AMERICAN LARCH ( TAMARACK) — (Lavix ameHcana) 



The American larch or tamarack is a northern species. It is generally 

 found on wet situations within its native range. In Iowa, occasional 

 specimens are found planted on upland soil. The tree closely resembles 

 the European species which is much more commonly planted. For orna- 



Fig. 16. — A young windbreak of Austrian pine (left), Douglas fir 

 (center) and red pine (right). All the trees are about ten years old. 

 Note the relatively slow growth of the Douglas fir. 



