38 THE LANDSCAPE GARDENING BOOK 



poplar; sixty feet high; any soil; rapid growing; effective 

 when used after the manner of the old world cypress. 



COLUMNAR TRAINED ARTIFICIAL FORMS 



EVERGREEN 



i Buxus sempervirens : boxwood; three to five feet high; grows 

 slowly and therefore does not require much shearing. 



2 Tsuga Canadensis: hemlock; may be kept at any height; 

 shear in the same manner as when used for a hedge. 



DECIDUOUS 



i Ligustrum: privet; from three to seven feet high; retains its 

 leaves during winter, so is actually half evergreen ; shear the 

 same as when used for a hedge. 



PYRAMIDAL NATURAL FORMS 



EVERGREEN 



i Thuya occidentalis, Sibirica: Siberian arborvitse; to thirty 

 feet high, of slow growth; loamy soil; broad at base and 

 tapering ; dense ; brighter green than other arborvitaes. 



2 Retinospora pisifera, plumosa (Ckamcscyparis pisifera, plu- 

 mosd): Japanese or Sawara cypress; three to eight feet 

 high and same width at base ; moist but well drained sandy 

 loam, partly shaded, and sheltered from drying winds. 



3 Retinospora ptsifera, squarrosa (C. pisifera, squarrosa) : blue 

 Japanese cypress ; same as above ; foliage silvery-blue, dense, 

 feathery. 



There are no deciduous natural pyramidal forms. Pyramidal 

 trained artificial forms, both evergreen and deciduous, may be 

 had in the same varieties as the Columnar forms. 



