EVERGREENS 167 



varieties the hardiest are the Picea pugens, 

 Pinus ponderosa, Pinus Strobus, Pinus sylves- 

 tris, Picea Engelmanni, Pseudotsuga Doug- 

 lassi and Abies concolor. Of the hardy dwarf 

 species one may recommend Pinus montana 

 {var. Mughus), Chamaecyparis Retinispora 

 and Picea nigia (var. Doumettii) . Nearly all 

 home grounds of any extent, especially in the 

 northern part of the country, need something 

 in the way of planting to serve as a windbreak. 

 The intelligent use of Evergreens for this pur- 

 pose deserves encouragement. Even from the 

 point of view of economy. Evergreens serve a 

 practical purpose when placed effectively and 

 ornamentally as a wind-shield in proximity to 

 a home, as it wiU be found that such a screen 

 will materially reduce the extent of the coal 

 supply otherwise needed to heat the building. 

 The Norway Spruce and the Scotch Pine are 

 extensively used as windbreaks. Of the two, 

 the Norway Spruce is the longer lived. The 

 Austrian Pine, the Douglas Spruce and the 

 White Spruce are also to be recommended. In 

 the eastern section of the country the Hemlock 

 is a good tree for the use under consideration 

 as also is the green form of the Colorado Blue 



