ADAPTATION OF CONIFERS 107 



from seeds. It is a strong, symmetrical, upright tree. The 

 color of foliage varies from light silvery to dull green, and from 

 a dark blue to light purple. Color and form make it a 

 valuable tree for the landscape-gardener. It is of very slow 

 growth until about a foot high, then it seems to shoot up very 

 fast, keeping its lower branches well to the ground. This 

 spruce is not so easily transplanted as some other piceas. It 

 should be root-pruned or transplanted at intervals. It develops 

 fibrous roots. Transplanting on cloudy days and a liberal 

 overhead watering for several consecutive days will benefit 

 the plants. The red-spider is a common enemy of this beautiful 

 spruce. A good force of water applied once or twice a week 

 during the gr6wing season will usually prevent this pest. 



Picea Engelmanni somewhat resembles the white spruce, 

 only it is more beautiful in color and texture of foliage, a 

 silvery-bluish hue. The habit of the tree resembles P. pungens. 

 It is just as valuable for ornamental planting, but should be 

 placed on northern exposures. It is unable to stand the hot, 

 dry winds in the open prairies, but is perfectly hardy in the 

 other Northern and Western States. The tree grows well in 

 a clay loam, but not in a gravelly or sandy soil. 



Another interesting spruce is Picea orientalis, native of 

 Asia. It does well only in partially shaded situations and it 

 does not grow rapidly. It holds its branches well to the ground 

 and thrives best in a rich black loarp. This species is subject 

 to winter sunburn, and should be planted on northern expo- 

 sures or where it is partially shaded during the winter months 

 by other trees. 



The hemlock spruce, Tsuga canadensis, likes moist ground 

 and will grow to a height of seventy-five to eighty feet, with a 

 circumference of six to nine feet, and uniform for two-thirds 

 of its length. When young and planted in a favorable soil, the 



