178 LANDSCAPE GARDENING. 



grow into a close spiry form. This is best done in the 

 spring before growth begins, though it may be done at any 

 time with fair success. Among the best of the evergreen 

 trees are : 



Spruce, White. Pine, Bhotan. 



" Norway. " Swiss Stone. 



*' Inverted Norway. Cypress, Japanese Pea-fruited. 



Colorado Blue. " " Thread-like. 



Fir, Nordmann's. Arbor-vitae, American. 



Juniper or Red Cedar. " " Siberian. 



Prostrate. " " Pyramidal. 



Pine, Austrian. " " Globe. 



" Weymouth or White. " " Golden. 



WHITE SPRUCE (Abies alba). A native tree of consider- 

 able beauty of form, rapid growth, and good color. It is 

 easily transplanted and grows in a variety of soils. 



NORWAY SPRUCE (A. excelsa). The most rapid growing 

 of the spruces and very beautiful while young, but after it 

 reaches the age of 20 years and upwards its lower branches 

 begin to fail and must be cut away. To prevent this in a 

 measure severe heading in of the leader should be prac- 

 tised, which forces the growth into the lower branches. It 

 grows rapidly even on very poor soil. The weeping variety 

 (A. e., var. invert a) is very unique in form, the branches 

 hanging downward close to the trunk, presenting a very 

 unusual appearance. 



COLORADO BLUE SPRUCE (Picea pungens). Fig. 90. 

 Seedlings of this most beautiful spruce vary very much in 

 color, some being dark green, like the Norway spruce, while 

 others are of the most beautiful glaucous or bluish-green 

 color. Some of these very " blue " specimens may be found 

 in every lot of seedlings, but to obtain them with certainty 



